Study on transverse seismic design of small and medium span bridges with elastomeric bearing pads
Li Jianzhong1 Tang Hu1,2
1. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China;
2. Shanghai Municipal Engineering Design Institute (Group) Co., Ltd., Shanghai 200092, China
Abstract：In order to improve the transverse seismic performance of small and medium span girder bridges with elastomeric bearing pads under strong earthquake excitations, the existing problems associated with this kind of bridge system in China were summarized based on the damage characteristics of this kind of girder bridges in Wenchuan earthquake and the comparison of different seismic design strategies in various Chinese and foreign seismic specifications of bridges. Furthermore, a new transverse seismic design method as a quasi-isolation approach was proposed by allowing the sacrifice of connections in superstructure and substructure. The design idea in the seismic design method was introduced, and the requirements for performance objective of various structural components under two levels of seismic fortification were described. The application of the proposed seismic design method to seismic design of girder bridges with elastomeric bearing pads was evaluated using finite element simulation. The results show that in the proposed seismic design method, the sliding effect of elastomeric bearing pads and damage or sacrifice of transverse restrainers can be utilized during a strong earthquake, so that the inertia force of girder transmitted between superstructure and substructure can be controlled, the substructures of piers and foundations can be protected from severe damage, and the relative displacement between girder and pier can be effectively controlled to avoid traffic interruption or even girder unseating caused by excessive girder displacement.
李建中 汤虎. 中小跨径板式橡胶支座梁桥横向抗震设计研究[J]. 土木工程学报, 2016, 49(11): 69-78.
Li Jianzhong Tang Hu. Study on transverse seismic design of small and medium span bridges with elastomeric bearing pads. 土木工程学报, 2016, 49(11): 69-78.
