内嵌耗能壳板高强钢圆钢管桥墩抗震性能  

Seismic performance of high-strength steel circular tubular bridge pier with embedded energy-dissipating shell plates

作　　者：李海锋[1,2] 洪依萍 骆杰鑫 陈赛剑 舒智 LI Haifeng;HONG Yiping;LUO Jiexin;CHEN Saijian;SHU Zhi(College of Civil Engineering,Huaqiao University,Xiamen,Fujian 361021,China;Key Laboratory for Intelligent Infrastructure and Monitoring of Fujian Province,Huaqiao University,Xiamen,Fujian 361021,China)

机构地区：[1]华侨大学土木工程学院,福建厦门361021 [2]华侨大学福建省智慧基础设施与监测重点实验室,福建厦门361021

出　　处：《中国矿业大学学报》2022年第4期769-778,共10页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51778248);福建省自然科学基金项目(2018J01075)。

摘　　要：基于损伤控制原理,提出根部设置可更换耗能墩柱的圆钢管桥墩.为提高圆钢管桥墩的强度,根部耗能墩柱采用高强钢圆钢管,并内嵌可为外部钢管壁板提供屈曲约束支撑作用的耗能壳板.为探讨此类内嵌耗能壳板高强钢圆钢管桥墩的抗震性能,共开展了2组7根此类圆钢管桥墩的拟静力试验研究.对比分析了桥墩试件的荷载位移滞回曲线、骨架曲线、承载能力、强度退化、刚度退化及耗能能力,获得了内嵌耗能壳板、轴压比等因素对此类高强钢圆钢管桥墩滞回性能和破坏机理的影响规律.试验结果表明:根部设置内嵌耗能壳板对高强钢圆钢管桥墩的承载力影响较小,但可使试件的变形能力和耗能能力增大.内嵌耗能壳板高强钢圆钢管桥墩的强度退化较为平缓,且最终残余变形减小.在柱顶轴向压力和水平往复荷载作用下,此类桥墩的初始刚度和耗能能力随轴压比的增大而增大.在偏心压力和水平往复荷载作用下,轴压比对此类高强钢圆钢管桥墩的破坏形态、刚度退化和耗能能力具有较大的影响,而对其承载力的影响较小.Based on the principle of damage control, a method to install replaceable energy-dissipating pier at the root of circular tubular bridge pier was proposed. The energy-dissipating pier adopted the high-strength steel as the wall plate of the pier, which can provide higher strength of the bridge pier. Furthermore, the embedded energy-dissipating shell plates were set in the inside of the wall plate of the pier as the anti-buckling constraint of the wall plate. To study seismic behavior of this type of bridge pier, a total of seven specimens of high-strength steel circular tubular bridge pier in two groups were designed. The hysteresis curves and the skeleton curves were obtained from the test results. The performance indexes of bearing capacity, strength degradation, stiffness degradation and energy-dissipating capacity were also compared and analyzed. The effects of setting embedded-dissipating shell plates and axial compression ratio on hysteretic behavior and failure modes of the pier were discussed. The results show that the embedded energy-dissipating shell plates have a little effect on bearing capacity of the pier. However, both deformation capacity and energy-dissipating capacity are increased. In addition, its strength degradation becomes smoother and residual deformation is significantly reduced. Under the action of axial pressure and horizontal reciprocating load on the top of the pier, both the initial stiffness and energy-dissipating capacity of the bridge pier with embedded energy-dissipating shell plates are increased gradually with the increase of axial pressure ration. Under the action of eccentric pressure and horizontal reciprocating load, the axial pressure ratio has great influence on the failure form, stiffness degradation and energy-dissipating capacity of the piers of this type high strength steel round steel tube while it has little influence on its bearing capacity.

关 键 词：高强钢 圆钢管桥墩 拟静力试验 抗震性能 

分 类 号：TD391[矿业工程—矿井建设]