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| Study on the random seismic response of large symmetric multi-span structures to wave-passage effect |
| ZHAO Bo1 WANG Yuan-qing2 CHEN Zhi-hua1 SHI Yong-jiu2 |
1.School of Civil Engineering, Tianjin University, Tianjin 300072
2. Key Laboratory of Structural Engineering and Vibration of Education Ministry, Department of Civil Engineering, Tsinghua University, Beijing 100084, China |
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Abstract This paper aimed at studying the influence mechanism of the seismic response of large multi-span structures to wave-passage effect. A simplified two span structural model is firstly used as the research object and the relative displacement of columns are used as the calculated response. The response power spectrum density formulae are derived by the multi-support pseudo excitation method. The changing law of the structural seismic peak response with wave-passage frequency is also calculated. These procedures are extended to multi-span structures to study the influence of different amounts of spans and different supporting forms to the structural seismic response. The result shows that: due to the pseudo static response, the relative displacement of the middle columns is larger than the corner columns that should be paid more attention in structural seismic design; the peak response does not increase a lot with the increasing amount of spans, however, different supporting forms may lead to distinct response. It is necessary to calculate the structural response to multi-support excitations according a specific supporting form.
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Received: 03 August 2015
Published: 15 October 2016
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