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http://dx.doi.org/10.9798/KOSHAM.2011.11.1.007

Peak Factors for Bridges Subjected to Asynchronous Multiple Earthquake Support Excitations  

Yoon, Chong-Yul (Dept. of Civil Eng. Hongik University)
Park, Joon-Seok (Dept. of Civil Eng. Hongik University)
Publication Information
Journal of the Korean Society of Hazard Mitigation / v.11, no.1, 2011 , pp. 7-13 More about this Journal
Abstract
Accurate response analysis of long span bridges subjected to seismic excitation is important for earthquake hazard mitigation. In this paper, the performance of a typical four span continuous reinforced concrete bridge model subjected to asynchronous multiple seismic excitations at the supports is investigated in both the time and frequency domains and the results are compared with that from a relevant uniform support excitations. In the time domain analysis, a linear modal superposition approach is used to compute the peak response values. In the frequency domain analysis, linear random vibration theory is used to determine the root mean square response values where the cross correlation effects between the modal and the support excitations on the seismic response of the bridge model are included. From the two sets of results, a practical range of peak factors which are defined to be the ratio of peak and the root mean square responses are suggested for displacements and forces in members. With reliable practical values of peak factors, the frequency domain analysis is preferred for the performance based design of bridges because of the computational advantage and the generality of the results as the time domain analysis only yields results for the specific excitation input.
Keywords
Structural analysis; Dynamic nonlinearity; Peak factor ranges; Bridges; Earthquake;
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