Seismic spatial effects on dynamic response of long-span bridges in stationary inhomogeneous random fields |
| |
Authors: | Jiahao Lin Yahui Zhang Yan Zhao |
| |
Institution: | State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China;State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China;State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116023, China |
| |
Abstract: | The seismic analysis of long-span bridges subjected to multiple ground excitations is an important problem. The conventional
response spectrum method neglects the spatial effects of ground motion, and therefore may result in questionable conclusions.
The random vibration approach has been regarded as more reliable. Unfortunately, so far, computational difficulties have not
yet been satisfactorily resolved. In this paper, an accurate and efficient random vibration approach — pseudo excitation method
(PEM), by which the above difficulties are overcome, is presented. It has been successfully used in the three dimensional
seismic analysis of a number of long-span bridges with thousands of degrees of freedom and dozens of supports. The numerical
results of a typical bridge show that the seismic spatial effects, particularly the wave passage effect, are sometimes quite
important in evaluating the safety of long-span bridges.
Supported by: NSFC (No. 10472023) and Doctoral Research Fund of the Chinese Ministry of Education |
| |
Keywords: | seismic response random vibration multiple excitation long-span bridge |
本文献已被 维普 万方数据 SpringerLink 等数据库收录! |
|