Analysis on the seismic responses of isolated skew bridges considering the ambient temperature effect and lead core heating of LRB under near-fault ground motions
ZHANG Zhanhong1,2,SHI Yan2,QIN Hongguo2
1.Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu 610207, China;
2.School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract:Low temperature environment and lead core heating can cause the change of mechanical properties of lead rubber bearings(LRBs). In order to explore its influence on the mechanical properties of bearings, the performance of the bearing was modified from the aspects of lead and rubber material characteristics to consider the influence of low temperature on the mechanical properties of the bearings. The strength degradation model was used to consider the influence of lead core heating on the mechanical properties of LRB. Based on OpenSees seismic analysis platform, a dynamic analysis model was established to study the relationship between seismic response and ambient temperature, lead core heating and skew under near fault ground motion. The results showed that the rotation of the beam and the displacement of the bearing are significantly reduced under the low temperature environment, while the seismic response of the pier is significantly increased. The lead core heating has little influence on the seismic response of piers and bearings. When the ambient temperature and lead core heating combined action, the shear force and torque of the pier are significantly amplified, and the low temperature environment plays a leading role in its seismic response. At the same low temperature, the amplification degree of longitudinal shear force and torque at the bottom of pier increases with the increase of skew. At -30℃, the longitudinal shear force and torque of the pier of skew bridge with the skewness of sixty are amplified by 20% and 39% respectively.
Key words:Skew bridge; Lead rubber bearing(LRB); Ambient temperature; Lead core heating; Seismic response; Skew angle
张展宏1,2,石岩2,秦洪果2. 考虑LRB环境温度效应及铅芯发热的隔震斜交桥近断层地震反应分析[J]. 振动与冲击, 2022, 41(14): 172-180.
ZHANG Zhanhong1,2,SHI Yan2,QIN Hongguo2. Analysis on the seismic responses of isolated skew bridges considering the ambient temperature effect and lead core heating of LRB under near-fault ground motions. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(14): 172-180.
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