双向压弯作用下矩形空心桥墩抗震性能试验研究  

Experimental Study on Seismic Performance of Rectangular Hollow Bridge Piers under Axial Load and Biaxial Bending

作　　者：赵彦[1,2] 韩强[1] 杜修力[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124 [2]防灾科技学院,河北三河065201

出　　处：《工程抗震与加固改造》2013年第5期11-18,10,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(50908005;50938006);NSFC-JST国际合作资助项目(51021140003)

摘　　要：针对高墩大跨桥梁中广泛采用的钢筋混凝土空心截面桥墩,制作了5根较大比例的桥墩模型,进行恒定轴力下的双向加载拟静力试验,评价其整体抗震性能,研究了纵筋配筋率、轴压比、箍筋间距对桥墩承载能力、延性、刚度、耗能能力等抗震性能的影响。结果表明:双向压弯作用下,各矩形空心截面试件的破坏形态为墩柱根部形成塑性铰的弯曲破坏。由于水平两向的相互耦合作用,构件两水平向的抗震性能相互影响,其抗震性能差异较大。这种横向配筋构型的钢筋混凝土矩形空心桥墩在双向水平地震作用下具有良好的抗震性能。Reinforced concrete hollow bridge piers are widely used in tall-column and long-span bridges. 5 reinforced concrete hollow bridge pier models with large ratio are built and tested under axial load and biaxial bending. The aim is to evaluate seismic performances of all the five models. The effects of longitudinal reinforcement ratio, axial compression ratio and stirrup spacing, on the seismic performance of hollow bridge columns are studied, such as load-carrying capacity, ductility, stiffness and energy dissipation ability. The results show that, under axial load and biaxial bending, these specimens are flexural failure model, and ultimate performance is dominated by flexural capacity due to the rupture /buckling of tensile longitudinal rebars at the bottom of the bridge columns. Because of mutual coupling effect, the seismic performance of two horizontal direction interact each other, and it have great difference. Reinforced concrete rectangular hollow bridge columns with configurations of lateral reinforcement subjected to bi-directional earthquake components have excellent earthquake resistance.

关 键 词：空心桥墩 双向弯曲 试验研究 抗震性能 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]