外置耗能壳板的钢框架桥墩抗震性能数值研究  

Numerical studies on seismic performance of steel frame pier with external energy dissipation shell plates

作　　者：孙钰苗 王源 布占宇[1] 孙利民[2] 谢文[1] SUN Yumiao;WANG Yuan;BU Zhanyu;SUN Limin;XIE Wen(School of Civil and Environmental Engineering,Ningbo University,Ningbo 315211,China;State Key Laboratory for Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]宁波大学土木与环境工程学院,浙江宁波315211 [2]同济大学土木工程防灾国家重点实验室,上海200092

出　　处：《自然灾害学报》2020年第2期128-137,共10页Journal of Natural Disasters

基　　金：国家自然科学基金项目(51608282,91515101-5)。

摘　　要：将结构震后功能可恢复和耗能构件可更换引入钢框架桥墩:在墩柱塑性铰区外置低屈服耗能壳板来保护墩柱主体结构,且外置耗能壳板易于震后修复或更换。采用数值模拟方法比较研究了钢框架桥墩与外置耗能壳板的钢框架桥墩的滞回曲线、耗能能力、等效黏滞阻尼比、刚度和强度等抗震性能,探讨了外置耗能壳板参数(如材料屈服应力、安装高度和厚度等)对钢框架桥墩抗震性能的影响及其规律。结果表明:外置耗能壳板的钢框架桥墩抗震性能优于钢框架桥墩,且外置耗能壳板先于墩柱屈服,可有效保护墩柱主体免遭地震损伤;外置耗能壳板安装高度和厚度明显影响钢框架桥墩的抗震性能,而外置耗能壳板屈服应力对钢框架桥墩抗震性能的影响可忽略。In this paper,the seismic design concept on the structural earthquake resilience and replaceable energy dissipation component is introduced to the steel frame pier.Namely,the easily repairable or replaceable energy dissipation shell plates are installed at the plastic hinge regions of the columns to enable the steel frame pier to remain elastic.The numerical simulations were conducted to investigate the seismic performance of the steel frame pier with/without the external energy dissipation shell plates,such as hysteretic curve,energy dissipation capacity,equivalent viscous damping ratio,stiffness and strength.Then the influences of the various parameters of the external energy dissipation shell plates,such as the yield stress,installed height and thickness,on the seismic performance of the steel frame pier were studied.The simulation results show that the seismic performance of the proposed steel frame pier with external energy dissipation shell plates is superior to that of the steel frame pier without the external energy dissipation shell plates.The yield displacement of the external energy dissipation shell plates is significantly less than that of the columns.Therefore,the external energy dissipation shell plates could effectively protect the column from the seismic damage.Moreover,the installed height and thickness of the external energy dissipation shell plates has an obvious influence on the seismic performance of the steel frame pier,while the yield stress of the external energy dissipation shell plates has no significant impact on the seismic performance of the steel frame pier.

关 键 词：震后功能可恢复 钢框架桥墩 低屈服耗能壳板 累积滞回耗能 等效黏滞阻尼比 

分 类 号：U442.55[建筑科学—桥梁与隧道工程] TU37[交通运输工程—道路与铁道工程]