Seismic Response Analysis and Performance Evaluation of Long-span Cable-stayed Bridge Based on ANSYS(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年04期
- Page:
- 19-26
- Research Field:
- Publishing date:
Info
- Title:
- Seismic Response Analysis and Performance Evaluation of Long-span Cable-stayed Bridge Based on ANSYS
- Author(s):
- ZHAO Ren-da; XU Zhi-qiang; ZOU Jian-bo; JIA Yi; LI Fu-hai
- School of Civil Engineering, Southwest Jiaotong University
- Keywords:
- cable-stayed bridge; seismic response analysis; nonlinear time-history analysis method; dynamic characteristic; moment curvature; capacity demand ratio
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to study the seismic response characteristics of the long-span cable-stayed bridge in the western high-intensity area, a long-span cable-stayed bridge with span of 177 m+360 m+177 m on Lanzhou south bypass expressway was taken as study object. The spatial dynamic model was established by finite element software ANSYS, the dynamic characteristics of the bridge were analyzed. The nonlinear seismic time-history analysis was used to calculate the seismic response of bridge structure under the 50-year probability of over 10% and over 2%. Besides, the seismic performance of the bridge was evaluated by the capacity demand ratio method. The results show that the longitudinal vibration of the main girder is not coupled with the lateral vibration under the earthquake. The vertical displacement of the main girder is greatly influenced by the longitudinal seismic action. Due to the asymmetry of the structure, the tower top displacement and the bottom bending moment of the tower 5 (south bridge tower) are all larger than those of the tower 4(north bridge tower). Under the two kinds of horizontal earthquakes of E1 and E2, the minimum capacity demand ratios of the key sections of piers and towers and the cables are greater than 1, and the seismic performance requirements are met. The longitudinal capacity demand ratio of piers is smaller than transverse ratio, while the longitudinal capacity demand ratio of bridge tower is larger that transverse ratio. It is recommended to install the antiseismic device on the transition pier and the auxiliary piers to strengthen the longitudinal bridge seismic performance.
Last Update: 2018-07-18