Sensitivity Analysis of Soil Site Response Modelling in Seismic ... - ITC

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Figure 2-1The four steps of probabilistic seismic hazard analysis (Kramer 1996). Probabilistic hazard assessment maps are generally called “peak acceleration (%g) with %10 probability of exceedance in 50 years “ (Figure 2-2). In simple words, the name refers to the chance of an earthquake to happen (probability percentage (2, 10 etc.)) in 50 years. Cornell (1968) added that even well defined single numbers such as the “expected lifetime maximum “ or “ 50-year” intensity are insufficient to give the engineer an understanding of how quickly the risk decreases as the ground motion intensity increase. This also still raises the questions for the convenient parameter, to use for the maps and visualization of the strong ground motion analysis. 18 Sensitivity Analysis Of Soil Site Response Modelling In Seismic Microzonation For Lalitpur, Nepal
Figure 2-2 A probabilistic seismic hazard map showing U.S. for the peak acceleration (%g) with %10 probability of exceedance in 50 years (USGS 2003). One of the recent discussions related to the probabilistic approach was on the selection of the proper ground motion parameter in calculations and representation of the maps. As can be seen form the Figure 2 the title of the map is a bit complex in style. For representations of the maps the ground motion parameters are obtained in acceleration, velocity and displacement. The first practices were mostly in favour of acceleration values. Then, velocity values were suggested for use as well. Regarding to these discussions, E.H. Field (2001) suggested using the response spectral acceleration, which is another parameter that can be derived from acceleration values. Traditionally, peak ground acceleration (PGA) has been used to quantify ground motion in probabilistic seismic hazard assessment. It is used in liquefaction analyses and to define building codes. PGA has been an important parameter since the earthquake and civil engineers were using this value for creating the building codes. On the other hand, it is suggested that Response Spectral Acceleration (SA), should be used. SA gives the maximum acceleration experienced by a damped, single-degreeof-freedom oscillator (a crude representation of building response) (Field 2001). Sensitivity Analysis Of Soil Site Response Modelling In Seismic Microzonation For Lalitpur, Nepal 19
Page 1 and 2: Sensitivity Analysis of Soil Site R
Page 3 and 4: Disclaimer This document describes
Page 5 and 6: Abstract For a proper design of ear
Page 7 and 8: 6.4. Sensitivity for Unit Weight ..
Page 9 and 10: Figure 3-7 The display of results f
Page 11 and 12: List of Tables Table 1-1 Investigat
Page 13 and 14: 1. Introduction 1.1. Scope of the s
Page 15 and 16: Figure 1-2 The seismic hazard map o
Page 17 and 18: 1.3. Research Objectives Sensitivit
Page 19 and 20: Methodology A) Literature Review B)
Page 21 and 22: • Array method using ambient vibr
Page 23 and 24: Shear wave velocity Just like the o
Page 25 and 26: • Hard copy maps of the engineeri
Page 27 and 28: 6. Chapter six the assessment of th
Page 29: place where the ground responses we
Page 33 and 34: Figure 2-4 The deterministic seismi
Page 35 and 36: create stronger shaking and make lo
Page 37 and 38: agreed on the method’s functional
Page 39 and 40: n = - e trans / e longitudinal Stra
Page 41 and 42: Several other studies have looked t
Page 43 and 44: the two approaches are not going to
Page 45 and 46: presence of heavy structures or sti
Page 47 and 48: other parameters are kept constant.
Page 49 and 50: Sensitivity Analysis Of Soil Site R
Page 51 and 52: In addition to the above-mentioned
Page 53 and 54: As mentioned by Ordonez (2002), the
Page 55 and 56: In the first option the dynamic soi
Page 57 and 58: The third option lets you to choose
Page 59: SHAKE 2000 METHODOLOGY MAIN MENU Cr
Page 62 and 63: Lalitpur is on the south of Kathman
Page 64 and 65: solidated sediments of the valley c
Page 66 and 67: 4.3. Seismicity Nepal is within the
Page 68 and 69: Figure 4-6 Map showing, seismic dat
Page 70 and 71: m. The numbers of blows are counted
Page 72 and 73: Figure 5-1 Map showing borehole loc
Page 74 and 75: For the other input parameter, stro
Page 76 and 77: and the third one is from real reco
Page 78 and 79: Scenario 1 Scenario 2 Scenario 3 PG
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7). Though the magnitude is great a
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B 23 - Analysis No. 1 - Profile No.
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used is Los Angeles, Magnitude: 6.2
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Soil Profile No. 1 - Analysis No. 1
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The soil profile is divided into fo
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the input data, all spatial calcula
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Table 5-10 The relations between th
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Methodology 2 Input and Output Rela
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Figure 5-16 The natural frequency m
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tween the inputs and outputs of the
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R 2 = 1- SSE SST SSE= ∑ (Yi-Ỳi
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6.3. Sensitivity to Input Motions T
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When the response spectra are consi
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Unit Weight (Kcf) 0,35 0,3 0,25 PGA
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PGA Values for Differing Depth Valu
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In order to give some range of valu
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Avouac, personal communication) and
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Based on the results of the sensiti
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• Using similar earthquake signal
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• IRIS, I. R. I. f. S. (2003). Se
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108 Sensitivity Analysis Of Soil Si
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Los Angeles Simulated strong ground
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Appendix B: Soil Profile Informatio
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medium to coarse Sand 2 5 16.4 18 1
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Clay 1 1 3.3 16 102 0.10 300 984 60
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6188 118 Sensitivity Analysis Of So
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26 0.29 1.15 1.85 1.31 0.93 27 0.2
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Sensitivity Analysis of Soil Site Response Modelling in Seismic ... - ITC

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