Suspension Bridge Vulnerability Analysis and Simplified Model(PDF)
《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]
- Issue:
- 2018年05期
- Page:
- 93-100
- Research Field:
- Publishing date:
Info
- Title:
- Suspension Bridge Vulnerability Analysis and Simplified Model
- Author(s):
- HUANG Yong; CHE Ze-xin; XIE Guang-ming
- Key Laboratory of Earthquake Engineering and Engineering Vibration of China Earthquake Administration, Institute of Engineering Mechanics ，CEA
- Keywords:
- suspension bridge; seismic fragility curve; nonlinear analysis; sensitivity analysis; simplified model
- PACS:
- -
- DOI:
- -
- Abstract:
- The statistical analysis of suspension bridges of vehicles that had been built and under construction in China was carried out, and the classification characteristics were summarized. The relationship between the main parameters of the bridges in the statistical sense was obtained, and the trend fitting formula was obtained by linear fitting. Three typical suspension bridges (double tower anchored parallel double cable plane bridge, double tower self-anchored parallel double cable plane bridge, single tower self-anchored space cable bridge) were selected to establish the finite element model, and the main parameters affecting the suspension bridge vibration sensitivity analysis was carried out. The damage index of different grades was determined by the bending moment curve of the tower bottom. The seismic response demand value was obtained by incremental dynamic analysis (IDA) method. The vulnerability of the suspension bridge was analyzed by calculating the capacity demand ratio of different damage indicators. Aiming at the need for rapid assessment of post-earthquake disasters, a simplified model of single tower was established to calculate the vulnerability curve. The results show that, for the bridges in the example, the main tower stiffness has great influence on the self-anchored parallel cablestayed suspension bridge, and the main cable stiffness has great influence on the groundanchored parallel cable-stayed suspension bridge. The stiffness of the main tower has great influence on the three types of bridges; the ground anchored suspension bridge is more vulnerable than the self-anchored suspension bridge, and the seismic performance of the double tower parallel cable bridge in the selfanchored suspension bridge is better than that of the single tower space cable bridge. The model can meet the needs of rapid assessment to a certain extent, and the error is basically acceptable in engineering.
Last Update: 2018-09-03