Free Essay

Seismic Assessment

In:

Submitted By riyonggota40
Words 1262
Pages 6
CHAPTER 1
INTRODUCTION
1.1) Background of the Study
Earthquake is very evident in the Philippines since this country has various volcanoes that are active in which this country located in the Pacific ring of fire wherein continuous series of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. There are already many records of strong earthquakes that happened especially in the most populated region of Philippines, National Capital Region (NCR), where casualty reports due to the damage and collapse of structures are about 34,000 people recorded after the strike of Casiguran Earthquake with magnitude 7.2 which landed in Metro Manila in 1968. Considering the event, people nowadays are less concerned about lifelines like bridges as they focus on the danger that vertical structure’s failure can lead to while people are lacking of preparedness and assessment. Bridges allows people to move from remote location by connecting them therefore these play important role in the society (Imhof, 2004). Regarding this, when bridges matter it is subjected to Seismic loading where it is one of the basic concepts of earthquake engineering there are factors to consider like the people who use the bridge and the residents nearby to attain the safety at all cost. Retrofitting is the strengthening of the bridges’ foundation by driving additional piles and reinforcing its columns thus there will be the increase of strength of the foundation.
Substantial data cited that Metro Manila will possibly be separated into four regions following the earthquake. The study pointed out that separation into four regions is summarized as: Western part of Metro Manila will be isolated from other parts of Metro Manila by fire and building collapse; northern and southern part of Metro Manila will be separated by building collapse and geographical condition; while all road networks running east-west, which are on the fault will be broken due to the movement. The West Valley Fault is being monitored by experts that could possibly trigger earthquakes in Metro Manila. There are fears that the West Valley Fault could make a major movement at any time. Likewise, the damage analysis results of Metro Manila’s vulnerability showed that the areas of Navotas Bay, Manila North Port, and South Eastern Manila City, Central Manila Bay, and Valenzuela-Caloocan South-Quezon west intersection are at high risk for fires. A risk assessment study funded by the Japan International Cooperation Agency noted that the West Valley Fault had moved four times and generated strong earthquakes within the last 1,400 years (De Vera, 2013). 1.2) Statement of the Problem
In this century limited sources and research are available regarding seismic risk assessment of lifeline like bridge thus; those structures are not ready when strong earthquake will occur. When low level seismic activity takes place, high probability that certain lifelines will be damage therefore another expense will be release for its repair and rehabilitation. Before an earthquake will happen there should be assessment so that damage will be prevented as well as the structure to collapse.
The probability of the failure of Bangkulasi Bridge is predetermined by using the fragility curves applying the principles of nonlinear static and dynamic analysis under large magnitude earthquakes. By creating the 3D model of the bridge it can locate the weakest point where certain greatest damage will occur thus using this study will help to pinpoint certain weakness and imply retrofitting and rehabilitation. 1.3) Significance of the Study Researches in the past are less concern in assessing lifelines such as bridges because most of the occurrences of damages are in the vertical structures but for the past years several years as the population increases, the demand for transportation lifelines such as bridges, calls for improvement and thus managing risk. If certain low level earthquake happens, there would be a probable damage of the bridge hence, imposing a hazard in utilizing the structure consequently, the course of life of the society would be influenced. When this study is successful and be implied, it would benefit the people who use the structure especially the people of Navotas that they will not be incur in the incoming earthquakes in a certain degree of magnitude thus, making them safe. Another benefit is to lessen the degree of damage when proper assessment is done meaning before seismic activity happens the Bridge is ready and reliable. 1.4) Objectives
General
The researchers aim to use seismic fragility curve method to Bangkulasi Bridge, Navotas referring to the ground motion data from recent earthquakes of Metro Manila and analyzing the structural plans of the bridge to acquire the assessment needed when certain damage is to occur upon the incoming seismic activity.

Specific a. To properly and accurately assess the performance and vulnerability of the Bangkukasi Bridge under shear and flexure failure from seismic load. b. To provide a better understanding on the behaviour of Bangkulasi Bridge when subjected to a high magnitude earthquake. a. To construct seismic fragility curves of the bridge.

1.5) Scope and Delimitation of the study
As the researchers we choose Bangkulasi Bridge in Navotas to assess seismic performance because there is yet no study provided. The research will develop fragility curves applying nonlinear static analysis and nonlinear dynamic analysis based on the gathered ground motion data and structural plans of Bangkulasi Bridge. 3D modelling of the bridge will be based on the acquired structural plans.
The fragility curves will only produce the scope of probability damage of the bridge thus assessing certain expected magnitude will be controlled.

1.6) Definition of Terms
Analysis
It is the process of breaking a complex topic or substance into smaller parts to gain a better understanding of it. The technique has been applied in the study of mathematics and logic.
Displacement
It is the difference between the initial position of a reference point and any later position. The amount any point affected by an earthquake has moved from where it was before the earthquake.
Earthquake
It is a term used to describe both sudden slip on a fault and the resulting ground shaking and radiated seismic energy caused by the slip, or by volcanic or magmatic activity, or other sudden stress changes in the earth.
Fault
It is a planar fracture or discontinuity in a volume of rock, across which there has been significant displacement along the fractures as a result of earth movement.
Fragility curves It is a statistical tool representing the probability of exceeding a given damage state (or performance) as a function of an engineering demand parameter that represents the ground motion.
Ground motion
It is the movement of the earth's surface from earthquakes or explosions. Ground motion is produced by waves that are generated by sudden slip on a fault or sudden pressure at the explosive source and travel through the earth and along its surface.
Kinematic
This refers to the general movement patterns and directions of the earth's rocks that produce rock deformation.
Magnitude
It is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs.
Lifelines
These are structures that are important or critical for a community to function, such as roadways, pipelines, power lines, sewers, communications, and port facilities.
Static
It is exerting force by reason of weight alone without motion or relating to bodies at rest or forces in equilibrium.
Seismic wave
It is an elastic wave generated by an impulse such as an earthquake or an explosion. Seismic waves may travel either along or near the earth's surface or through the earth's interior.

Similar Documents

Premium Essay

Essay On Seismic Tremor

...A seismic tremor (otherwise called a shudder, tremor or quake) is the shaking of the surface of the Earth, coming about because of the sudden arrival of vitality in the Earth's lithosphere that makes seismic waves. Quakes can extend in size from those that are weak to the point that they can't be felt to those sufficiently vicious to hurl individuals around and decimate entire urban areas. The seismicity or seismic action of a territory alludes to the recurrence, sort and size of quakes experienced over a time frame, Quakes are measured utilizing estimations from seismometers. The minute size is the most well-known scale on which tremors bigger than roughly 5 are accounted for the whole globe. The more various quakes littler than greatness 5...

Words: 1902 - Pages: 8

Free Essay

Mass Media

...country, University of Utah researchers found. Share This: 125 "We detected seismic waves created by the oceans waves both hitting the East Coast and smashing into each other," with the most intense seismic activity recorded when Sandy turned toward Long Island, New York and New Jersey, says Keith Koper, director of the University of Utah Seismograph Stations. "We were able to track the hurricane by looking at the 'microseisms' [relatively small seismic waves] generated by Sandy," says Oner Sufri, a University of Utah geology and geophysics doctoral student and first author of the study with Koper. "As the storm turned west-northwest, the seismometers lit up." Sufri was scheduled to present the preliminary, unpublished findings in Salt Lake City Thursday, April 18 during the Seismological Society of America's annual meeting. There is no magnitude scale for the microseisms generated by Sandy, but Koper says they range from roughly 2 to 3 on a quake magnitude scale. The conversion is difficult because earthquakes pack a quick punch, while storms unleash their energy for many hours. The shaking was caused partly by waves hitting the East Coast, but much more by waves colliding with other waves in the ocean, setting up "standing waves" that reach the seafloor and transmit energy to it, Sufri and Koper say. While many people may not realize it, earthquakes are not the only events that generate seismic waves. So do mining and mine collapses; storm winds, waves and tornadoes; traffic...

Words: 1036 - Pages: 5

Free Essay

Determining the Epicenter Using Seismographs Lab

...E E 1.26 in 400/1.26=317.46km/inch E=35.5 N 119 W Determining the Epicenter Using 3 Seismographs Michelle Veitz This study determines the exact epicenter of a fictitious earthquake. Using 3 different seismograph reports from three locations (Albuquerque, Boise and Sacramento) and a map, we are able to pinpoint the exact epicenter. The epicenter was estimated to be 35.5 degrees North latitude and 119 degrees West longitude. Partial information was provided in a grid format regarding seismographic data of 3 locations. Using a seismograph report from location Albuquerque, Δt was determined. Using Vp and Vs provided, tp and distance to the epicenter was determined using formulas provided by the professor. After determining a scale for the map, the radial distance was determined by dividing the distance to the epicenter by the appropriate scale. Circles were placed around each location based off of those calculations. At the intersecting point of all three circles is the epicenter for this particular earthquake. These calculations are found in the grid below. Using a measurement of 24 seconds per tic mark on the seismograph, 96 seconds was used as the Δt for Albuquerque. Δt was given as 79.58 sec for Boise and 30.96 for Sacramento. Vp was given as 6.01 km/sec and Vs was given as 4.1 km/sec. Using the formula, tp = (Vs * ∆t) / (Vp – Vs), tp was determined for all 3 locations. Using formula Dist. = Vp km/sec * tp sec, the distances to the epicenter was calculated...

Words: 296 - Pages: 2

Premium Essay

Tetonic Hazards - Haiti Earthquake

...Tectonic Hazards: Earthquakes Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. They don't just slide smoothly; the rocks catch on each other. The rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that's built up. When the rocks break, the earthquake occurs. During the earthquake and afterward, the plates or blocks of rock start moving, and they continue to move until they get stuck again. The spot underground where the rock breaks is called the focus of the earthquake. The place right above the focus (on top of the ground) is called the epicentre of the earthquake.  Haiti Earthquake: What? A 7.0 magnitude earthquake When?12th January 2010 at 16.53 local time (21.53 GMT). Where?The earthquake occurred 18.457°N, 72.533°W. The focus of the earthquake was 13km (8.1 miles) below the surface of the earth. The short term effects of the Haiti earthquake are· Buildings being destroyed, roads and docks. Making it difficult to get aid to the people who need it. Example food, clean drinking water, clothes, cooking utensils, temporally shelters and most importantly drugs and medicines. · Without clean drinking water and dead bodies rotting in the hot sun the risk of life threatening diseases...

Words: 502 - Pages: 3

Free Essay

Metamorphic Rocks

...Earthquakes and fault lines Scientists and geologists have a pretty good understanding of how the plates move and how this is related to earthquake activity. There are four different types of plate boundaries. First we have Divergent boundaries, where new crust is generated as the plates pull away from each other. Second we have Convergent boundaries and this is where the crust is destroyed as one plate is forced under another. Third we have the transform boundaries and this is where the crust is not created or destroyed as the plates slide horizontally past the other. Last we have Plate boundary zones where broad belts in which boundaries are not well defined and plate interactions are not clearly understood. The best known divergent boundaries is the mid-Atlantic Ridge, it is a submerged mountain range, which extends from the Arctic Ocean down South of Africa. This mountain range has been spreading apart for millions of years, which allows new magma to surface thus increasing the size of the mountains 2.5 centimeters each year. The two plates involved here are the American and the Eurasian plates and they are separating Iceland. The convergent boundaries are where the crust is being destroyed at about the same rate as it is being replaced in other areas of the world. These boundaries are long and deep trenches in the ocean and it are created by one plate being forced under another. These areas include the ring of fire which is a geographic region that has volcanoes that are...

Words: 788 - Pages: 4

Premium Essay

Earthquakes

...Mario Salgado Earthquakes Science SC300 Unit 4 May 12, 2011 Professor Jayne Yenko Earthquakes There are not many things in life that petrify me but earthquakes are pretty high on the list. Just the uncertainty of not knowing if this could be the next big one. Realistically speaking, where can you go to be safe from an earthquake? Luckily for me, there seems to be no great danger of earthquakes in the southeast region of the US. I live in Atlanta, Ga. and according to the map fig.17-22** in our text it seems that we are in a blue low risk area, where individual measurements of seismic wave velocities reveal cooler rocks under the southeastern US. However, just a little further northwest of Georgia according to the seismic map in the USGC website* there seems to be a small area of higher earthquake activity between Missouri, and Tennessee. The Midwest seems to be free of earthquakes while the west coast has an abundance of earthquake activity. California has the 2nd highest amount of earthquake activity in the US, after Alaska that produces more than half the earthquakes in the country. The earth has three major subduction zones. The first is a large area called the pacific ring of fire, this includes North and South America the east coast of Asia, and the western pacific islands of the Philippines, Indonesia, New Guinea, and New Zealand. Most of the plates are being subducted, while some plates scrape past each other. The second major divergent or earthquake...

Words: 1247 - Pages: 5

Premium Essay

Essay On Landslides

...Sorriso-Valvo, 1994; Dikau et al., 1996). Each landslide event can be described to a process which triggers the failure of a potentially unstable rock mass (Varnes, 1978; Waltham, 2009). Thus, the cause of slope failure and the resulting landslide is apparently the combination of predisposing factors and the triggering event. Recognition of landslides and their potential sites can therefore be made by assessment of both predisposing and triggering factors. Landslide triggering factor may be natural or anthropogenic. According to Schuster and Krizek (1978), Varnes (1978) and Waltham (2009), the principal causes of slope failure that could trigger landslides include: (i) water pressure, either rain water or ground water; (ii) toe of slope removal which reduces resistance to movement, including natural river undercutting or artificial road cutting or quarrying; (iii) head loading which increases the driving force of slides; (iv) strength reduction by weathering which ultimately weakens all slope materials; and (v) vibrations caused either by natural or human induced earthquakes. Nonetheless, assessment of many landslides in the past has shown that most of them have complex origins depending on where and when a number of contributory factors coincide. Landslide hazard analysis and mapping can provide useful information for catastrophic loss reduction, and assist in the development of guidelines for sustainable land use planning. The analysis is used to identify the factors that are related...

Words: 1571 - Pages: 7

Premium Essay

Discuss the View That the Impact of Earthquakes Depends Primarily on Human Factors

...Discuss the view that the impact of earthquakes depends primarily on human factors: Earthquakes are caused by movement of tectonic plates that covering the earth’s surface. They occur at all plate boundaries; destructive, constructive and conservative, but the most intense tend to occur at subduction zones and conservative faults, such as the San Andres Fault in California. Every seismic event will be unique, and there are many factors influencing the extent to which it will have an impact on the environment and the populace. In many situations, both physical factors, related to the nature of the event and the topography of the area, and human factors, linked to demography and land use, have an influence on the effects of a hazard. When evaluating the impacts of an earthquake, the demography of an area will almost certainly have a large influence. Clearly, a very densely populated area will be more likely to have a higher death toll or a wider radius of influence than an event occurring in a more sparsely populated area, due to the simple fact that there are more people in the same amount of space to be affected. However it is not just this statistical fact that leads to a more people being affected. In many LEDC’s, the highest population density occurs in slum areas and shanty towns. The people living in these areas are ill equipped to cope with the effects of an earthquake due to a combination of factors, mostly centred around the conditions in which they live. The same is true...

Words: 1736 - Pages: 7

Premium Essay

Environemnt

...Inter-jurisdictional Coordination of EA: Challenges and opportunities arising from differences among provincial and territorial assessment requirements and processes Report for the Environmental Planning and Assessment Caucus, Canadian Environmental Network East Coast Environmental Law Association Deborah Carver, Robert Gibson, Jessie Irving, Hilary Kennan, Erin Burbidge November 20, 2010 ______________________________________________________________________ Summary.........................................................................................................................................3 I Inter-jurisdictional coordination of EA........................................................................... 4 II Basic principles for upwards harmonization through inter-jurisdictional EA coordination.............................................................................................................................. 6 III Immediate and underlying concerns driving attention to improved inter-jurisdictional coordination.............................................................................................................................. 8 IV Provincial EA regime differences as a challenge and an opportunity for coordination and harmonization ..................................................................................................................11 V Key characteristics of the provincial and territorial EA regimes ..................................13...

Words: 50661 - Pages: 203

Free Essay

Paper

...Assignment: Clinical Assessment Chaz Hedgspeth Axia College What other information would you like to learn during the interview with the family? What questions would you ask? If I were interviewing the family I would want to know extensive information about the child, including her home life, her life at school, and what types of relationships she has in both environments. Does she interact with the children well at school? Does she get punished for doing bad and rewarded for doing well? I would also want to know when she started behaving this way in the first place. Has she always behaved in this fashion? When did the behavior begin? Knowing if the behavior has affected her everyday living would be essential as well and if they feel like she is a threat to herself. Do her teachers say anything about her in the classroom? Is her attitude affecting her grades? Do you as the parents feel like your child is a threat to herself or anyone else around her? Finding out all of the information about the child’s life is essential to getting a complete outlook on what the possibilities of her behavior are. In addition to the clinical interview, what other types of assessments would you utilize? What would you hope to learn with each type of assessment? Since a patient is able to be assessed from the different psychological perspectives, I would want to assess the child with a combination of each of the perspective theories. First, I would want to assess the...

Words: 826 - Pages: 4

Premium Essay

Nurse Prescribing V150 a Case Study

...UNIVERSITY OF THE WEST OF SCOTLAND NURSE PRESCRIBING V150 CASE STUDY COURSE: NURS09125 BANNER NUMBER: B00113677 DATE OF SUBMISSION 13/12/10 COURSE LEADER FRANCES DOWNER WORD COUNT: 3745 CONTENTS PAGE 1. INTRODUCTION & GENERAL OVERVIEW, Pgs3-4. 2. ASSESSMENT PROCESS, Pgs 5-8 3. TREATMENT OPTIONS, Pgs 9-12. 4. EVALUATION, Pgs 13-16 5. CONCLUSION. Pg 17 6. COPY OF PRESCRIPTION, Pg 18 7. REFERENCE SECTION, Pgs 19-23 8. BIBLIOGRAPHY, Pg 24. INTRODUCTION In the following case study, the author will discuss the issues surrounding a seventy-year-old female with a chronic neuropathic ulcer on the sole of her right foot and the rationale and implications of prescribing in the community setting. The author a (trainee nurse prescriber) will display the need for a robust assessment, exploring all areas of health and well-being in order to achieve a safe outcome. The author will further follow current guidelines and be mentored by a senior nurse prescriber throughout the process. The aim of the case study is to display the implications involved in issuing a nurse prescription if deemed appropriate. With regard to writing a prescription as a qualified practioner, the author will adhere to the guidance within the Nursing and Midwifery Council (NMC 2006a) standards for safe prescribing. To protect this patient’s identity and maintain confidentiality, she will be referred to as Mrs X throughout the...

Words: 4607 - Pages: 19

Premium Essay

Essay Questions

...Essay Questions Kristy Bazzanella Liberty University Essay Questions Assessment is a vital component in the counseling process. Use of both informal and formal assessment methods ensure that clinicians judgments are non-biased, and when utilized correctly aide in formulating of case conceptualizations and treatment plans (Whitson, 2013). The primary purpose of assessments, for the counselor, is to obtain information to effectively counsel clients. According to Whitson (2013), once all information is gained, the counselor, can “either formally or informally, diagnose the client” (p.285). It is critical that the counselor choose assessments that are both reliable and valid. The choice of assessment type and instrument will vary depending on the presenting problem, age, and cognitive and developmental state of client. Assessments will also vary according to settings. For example, the choice of assessment instruments utilized by a school counselor will differ greatly from the assessments utilized in a drug treatment or psychiatric facility. Assessments can have either a negative or positive impact on treatment planning. Counselors who use informal assessment techniques, such as unstructured interviews may find that the information gathered is not reliable and, therefore, prone to error (Whitson, 2013, p.111). Inexperienced counselors who use unstructured interviews have been observed to focus on minor issues and have failed to collect adequate data...

Words: 750 - Pages: 3

Premium Essay

Financial Analysis

...Weeks 13 and 14 (4/21-5/1): Lease Financing and Course Conclusion Yikes! We are at the bittersweet time in our course together. It is almost over. We’ll miss it so much, but we might also want to do something else with the rest of our lives. In these last 1.7 weeks, we’ll cover another topic which, in addition to Financial Analysis and Planning, serves the function of integrating much of the material we have covered. That topic is Lease Financing. There is a lot of material on the structure of the lease and on the accounting treatment of leases, but the analytical focus will be on the lease-buy decision. The lease-buy decision is actually a financing decision. The analysis of the advisability of a lease typically follows a prior decision to acquire an asset (based on an investment decision analysis). In lease analyses we are comparing lease financing (which is a type of debt) to “regular” debt financing. Video 20 and Chapter 25 in BMA are the main materials. As you review the video, work through the lease example in the Excel file (financing uma 13.xlsx). Toward the end of video 20 is described the concept of adjusted present value. Pay close attention to this material as well, because it describes how in some very specific cases the results of an investment decision and a financing decision must be considered together. The deliverable for this two-week period is Exercise 4, which is an individual, i.e., not a team, exercise. We’ll also use the time to review...

Words: 666 - Pages: 3

Premium Essay

Informal Assessment of a Student

...Running Title: Informal Assessment Informal Assessment of a Student Barbara Brown Grand Canyon University: SPE-536 Professor Haynes October 31, 2012 Informal Assessment of a Student In the process of developing an informal assessment I have discovered how important it is to effectively develop an assessment that matches the criteria that I want to assess my students’ progress. To do an informal assessment on my students, I chose the unit that we are working on in Biology. At the moment we are learning about the parts of the cells and how the cell works to maintain life. As I did an informal observation on different students in the classroom, I observed that several of the students were having difficulties remembering the parts of the cell and their functions. To solve this problem, I developed an informal assessment that would allow students to learn the cell parts and its functions. The informal assessment that I developed is a game of battle ship on Quia. Quia is a learning tool that I have had the opportunity to use and observe other educators use to help educate and enhance their students learning. The game consists of the game battleship. Like the game, the player is looking for the ships of the enemy. When the student picks a spot that the enemy ship is located on, a question pops up asking a question supply a multiple choice of four answers that the student can choose from. If answered correctly the student gets a hit. There are about 17 questions;...

Words: 796 - Pages: 4

Premium Essay

Gung Ho Training in Organization Need Assessment, Development, and Evaluation

...Gung Ho Training in Organization Need Assessment, Development, and Evaluation Peer Shmelzer-Moratin MGMT 3441 HPU Term 2 2012 Gung Ho is a 1986 Ron Howard comedy film, released by Paramount Pictures, and starring Michael Keaton and Gedde Watanabe. The film's story portrayed the takeover of an American car plant by a Japanese corporation. While it might seem like just another fun movie to watch on a Friday night, it is actually a great movie with great lesson to teach to those who underestimate the power of training. Training is defined as the systematic acquisition of skills, rules, concepts, or attitudes that result in improved performance in another environment (Goldstein 1). The above movie is great example of how training can lead to much better results and performance. Irwin Goldstein, a leader in the training field, teams up with Kevin Ford and wrote "Training in Organization” to provide readers with a framework for examining and establishing viable training programs in education, business, and government. Capturing the excitement of training research and systems issues, the author discusses training as it occurs in real organizations. In their book they present different types of training programs and their effectiveness, ways in which training needs to be assessed and evaluated. With today’s technology the concern for utilizing training systems and developing new ones increase. Trainers are struggling with how to work with teams. The movie Gung Ho presents...

Words: 2482 - Pages: 10