Seismic performance of mediumspan continuous beam bridges in highintensity mountainous areas based on different seismic structural systems(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2021年2期
- Page:
- 125-134
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Seismic performance of mediumspan continuous beam bridges in highintensity mountainous areas based on different seismic structural systems
- Author(s):
- SUN Wuyun1; 2; FAN Xinrong1; WANG Xiaoming3; LI Lifeng2; WU Zhaohua2
- (1. Yunnan Wutangxun Expressway Co., Ltd, Kunming 651500, Yunnan, China; 2. School of CivilEngineering, Hunan University, Changsha 410082, Hunan, China; 3. Yunnan CommunicationsInvestment Group Highway Construction Co., Ltd., Kunming 651500, Yunnan, China)
- Keywords:
- bridge engineering; reasonable seismic system; vulnerability; bearing; high intensity mountainous; steelconcrete composite bridge
- PACS:
- -
- DOI:
- -
- Abstract:
- Aiming at the seismic problem of bridges in highintensity mountainous areas, Yunnan Tiansheng Bridge, a middlespan steelconcrete composite beam bridge in a highintensity mountainous area, was taken as the research object to explore the reasonable seismic structure arrangement. The seismic evaluation and analysis process of mountainous bridges was proposed, six seismic basic systems were proposed, and then, a series of refined nonlinear dynamic models taking nonlinear proprieties into consideration were established by OpenSees. Considering the uncertainty of seismic wave, 100 seismic waves with wide intensity range based the PEER database were selected for the whole process nonlinear time history analysis of the engineering bridge and a lot of results of nonlinear analysis were obtained. According to these results, the theory of seismic vulnerability analysis was adopted, the vulnerability curves of components and systems were established by using the nonlinear dynamic method. Based on the damage probability, the seismic performance and dangerous components of the bridge were evaluated. The results show that the bearing and the block are the key components of the seismic system and with the increase of damage degree, the vulnerability of bearing is gradually higher than other kinds of dangerous components, and the damage probability of block is also higher, which are the key components of seismic system. Setting high damping rubber bearing and block can effectively reduce the damage probability of bridge components and improve the seismic performance of the system, which is beneficial to seismic. Considering the component failure and system failure comprehensively, it is recommended to adopt the seismic measures of high damping rubber bearing and doublelayer block as the final seismic system of the supporting project. The concept of reasonable seismic system of bridge and the corresponding seismic evaluation and analysis process can be used as a reference for seismic design of high intensity mountainous bridges. 3 tabs, 11 figs, 38 refs.
Last Update: 2021-04-02