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Influence of earthquake ground motion incoherency on multi-support structures |
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| Authors: | Qingshan Yang M Saiid Saiidi Wang Hang Ahmad Itani |
| Institution: | 1. School of Civil Engineering and Architecture, Northern .Jiaotong University, Beijing, 100044, China 2. Department of Civil Engineering, University of Nevada, Reno, NV, 89557, USA 3. Beijing General Municipal Engineering Design and Research Institute, China 4. Department of Civil Engineering, University ofNevada, Reno, NV, 89557, USA |
| Abstract: | A linear response history analysis method is used to determine the influence of three factors: geometric incoherency, wave-passage, and local site characteristics on the response of multi-support structures subjected to differential ground motions. A one-span frame and a reduced model of a 24-span bridge, located in Las Vegas, Nevada are studied, in which the influence of each of the three factors and their combinations are analyzed. It is revealed that the incoherency of earthquake ground motion can have a dramatic influence on structural response by modifying the dynamics response to uniform excitation and inducing pseudo-static response, which does not exist in structures subjected to uniform excitation. The total response when all three sources of ground motion incoherency are included is generally larger than that of uniform excitation. |
| Keywords: | earthquake bridges ground motion incoherency wave passage local site characteristics multi-support structures |
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