Damper parameter optimization of steel box girder cablestayedbridge with UHPC pavement under earthquake(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:
- 89-101
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Damper parameter optimization of steel box girder cablestayedbridge with UHPC pavement under earthquake
- Author(s):
- ZHOU Mi1; 2; LIU Yang1; 2; ZHAO Wei3
- (1. School of Highway, Changan University, Xian 710064, Shaanxi, China; 2. Key Laboratory for OldBridge Detection and Reinforcement Technology of the Ministry of Transportation, ChanganUniversity, Xian 710064, Shaanxi, China; 3. CCCC Second Highway Survey andDesign Institute Co., Ltd., Wuhan 430056, Hubei, China)
- Keywords:
- bridge engineering; seismic; damper parameter; sensitivity analysis; UHPC pavement; restraint system
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to explore the influence of increasing dead weight of longspan steel box girder cablestayed bridge with UHPC pavement on seismic response, and further select reasonable restraint system and optimize the parameters of shock absorption and isolation device, the Rongjiang Bridge in the Ⅷ degree area was taking as the research object, the full bridge finite element analysis model was established by using the CSI Bridge finite element analysis software, and the comparative analysis of the bridge structure seismic response under different restraint systems was carried out. The parameter optimization of the restraint system with the longitudinal viscous dampers was carried out, the nonlinear relationship between the seismic response of the key section of the structure under the earthquake action and the damper parameters was established, and the reasonable values of the damper parameters were determined based on the sensitivity analysis. The results show that the steel box girder cablestayed bridge with UHPC pavement has better response values of bending moment, shear force and displacement at the key sections of the tower and pier under the action of earthquake than that of asphalt paving, and the negative influence of the weight of steelUHPC composite deck structure on the seismic performance of the bridge can be effectively reduced by installing dampers between the towers and beams. By analyzing the influence of damper parameters on the internal force response and displacement response of bridge structure under earthquake, it can be seen that the influence of damping constant is dominant, and the velocity index is relatively weak, by comparing the seismic response of the bridge structure under different damper parameters, the viscous damper parameters of the bridge structure are selected as follows, damping constant C=3 000, velocity index α=0.3, it can provide a reference for the selection of restraint system and the optimization of damper parameters of similar bridge structures in high intensity seismic region. 5 tabs, 26 figs, 30 refs.
Last Update: 2021-04-02