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Large span single tower suspension bridge seismic response analysis and seismic isolation Measures

Author: ChenGuoYang
Tutor: YangMengGang
School: Central South University
Course: Bridge and Tunnel Engineering
Keywords: Single-tower suspension bridge Earthquake Response Viscous dampers LRB Less isolation
CLC: U442.55
Type: Master's thesis
Year: 2010
Downloads: 93
Quote: 1
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Abstract


In recent years , as China's economic strength and traffic development, self-anchored suspension developed very rapidly . But for this structure seismic theory and analysis and improvement is still not deep enough , in order to ensure the bridge structure under seismic safety and prolong the service life of the bridge , on the large-span suspension bridge for seismic research is a very necessary and meaningful topic. Based on the geometric nonlinear finite element theory, Foshan Ping Sheng bridge engineering background , for large span single tower self-anchored suspension and reduce the seismic response of isolation measures were analyzed and studied . The main contents and results are as follows : 1. Applied large general-purpose finite element software MIDAS / Civil, established a flat wins Bridge real bridge dynamic finite element model and the vertical seismic isolation device with dynamic finite element model . Dynamic characteristic analysis showed that the seismic isolation devices to join the original floating structure system change the dynamic characteristics , so that the first -order longitudinal drift modes disappear , greatly improving the bridge longitudinal stiffness . 2 Use the response spectrum method and time history analysis method to analyze the level of the original floating bridge architecture wins in the longitudinal and vertical seismic waves seismic waves under the seismic response . The results showed that the main beam and the longitudinal displacement of the larger tower , vertical seismic response on vertical structural system was less affected . 3 orthogonal design parameters for viscous dampers are optimized for parameter optimization after viscous dampers less isolated effects were analyzed. The results showed that the vertical bridge to earthquake, the viscous damper damping system reduces the longitudinal displacement of the top of 43.52% , tower longitudinal displacement of the beam connection reduces 75.45% , reduced longitudinal displacement of the beam end up 72.43% . 4 using orthogonal design LRB parameters were optimized parameters determined for the reduction LRB isolated effects were analyzed. The results showed that the vertical bridge to earthquake, the LRB damping system reduces the longitudinal displacement of the top of 35.18% , tower longitudinal displacement of the beam connection reduces 63.8% , longitudinal displacement of the beam end is reduced 64.68 % .

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CLC: > Transportation > Road transport > Bridges and Culverts > Investigation, design and calculation > Bridge Design > Damage Analysis and Seismic Design
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