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CEE125-SPR08-HW5

# CEE125-SPR08-HW5 - Problem 5-3(5 points The strong motion...

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CEE 125 R. Nigbor Earthquake Engineering Spring 2008 Assignment No. 5 DUE WEDNESDAY MAY 28, 2008 Problem 5-1 (3 points) Use the data from Homework 4, Problem 1 to create two models of the soil column at the Arleta strong motion station. One model should be a multi-layer model based on the soil layers from the geological log. The other should be a two-layer model, with one soil layer over an elastic rock layer (“engineering rock”). For each model, get average Vp and Vs and estimate the density for each layer. Display your results graphically per Text Figure 7.9. These are interpreted models, so there are many “correct” answers. Use your engineering judgment here. Problem 5-2 (2 points ) For your simple two-layer model in Problem 4-1, calculate and plot the amplification (transfer function) versus frequency for the Arleta site. Use the appropriate text equation for soil over elastic rock. Repeat for 3%, 5%, and 10% damping, plotting the three curves on the same plot.
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Unformatted text preview: Problem 5-3 (5 points) The strong motion station at Arleta is inside a fire station. Assume you are designing a replacement 2-story, steel-moment-frame fire station building for that site. The building will be approximately the same size as the existing building (use Google Earth to estimate the area of the existing building if needed). Assume 5% damping. Assume that there are no horizontal irregularities. Develop the CBC (IBC2006) design spectrum for the building . List your assumptions & calculations needed to develop the design spectrum. Plot your design spectrum along with the earthquake motions measured during the 1994 Northridge Earthquake. Discuss the differences, especially at the estimated period of the new building. Assuming a repeat of the 1994 Northridge ground motions, how do you think your new building would perform?...
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