高强钢筋高强混凝土空间梁柱组合体抗震性能试验与恢复力模型研究  

Experimental study on seismic behavior and restoring force model of spatial beam-column subassemblies with high strength reinforcements and high strength concrete

作　　者：魏春明[1] 温志坡 鞠彦忠[1] 王德弘[1] WEI Chunming;WEN Zhipo;JU Yanzhong;WANG Dehong(School of Civil Engineering and Architecture,Northeast Electric Power University,Jilin 132012,China;Shandong Electric Power Engineering Consulting Institute Corp.,Ltd.,Jinan 250013,China)

机构地区：[1]东北电力大学建筑工程学院,吉林吉林132012 [2]山东电力工程咨询院有限公司,山东济南250013

出　　处：《建筑结构学报》2021年第11期145-154,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51478094)。

摘　　要：为研究高强钢筋高强混凝土(HRC)空间梁柱组合体的抗震性能,对8根足尺的HRC空间梁柱组合体进行了多维低周反复加载试验研究,主要设计变化参数为轴压比、并筋根数和加载规则等。研究了空间梁柱组合体的破坏形态、滞回曲线、骨架曲线、刚度退化、延性和耗能能力等,并基于试验建立了HRC空间梁柱组合体的恢复力模型。试验研究结果表明:按照现行规范设计的空间梁柱组合体在空间荷载作用下均出现了节点剪切破坏;提高轴压比能够增大梁端的峰值荷载,但同时组合体的延性降低,耗能能力减弱,刚度退化加重;三种加载规则中,加载规则1(主梁端和直交梁端同步加载)下试件的破坏特征与地震作用下节点的破坏特征吻合最好,但其承载能力和延性也最差;相对于单筋布置方式,并筋布置方式的组合体延性显著降低。依据试验研究结果,建立了考虑刚度退化、强度退化和捏缩效应的三折线定点指向型恢复力模型,该模型计算结果与试验结果吻合较好,模型可为实际工程结构进行弹塑性地震反应分析提供参考。To investigate the seismic behavior of spatial beam-column subassemblies with high strength reinforcements and high strength concrete(HRC), multi-dimensional low cyclic loading tests on eight full-scale spatial beam-column subassemblies with HRC were conducted. The effects of axial compression ratio, the bundle condition of bars and the loading protocols were discussed. The failure modes, hysteretic curves, skeleton curves, stiffness degradation, ductility performance and energy dissipation capacity of the spatial beam-column subassemblies were studied. Based on the test results, a restoring force model of spatial beam-column subassemblies with HRC was established. The test results show that the shear failure occurrs in all the spatial joints designed in accordance with the current codes under spatial loads. The peak strength of the beam ends increases with the increasing axial compression ratio, but the ductility and energy dissipation capacity are decreased, and the stiffness degradation is more evident. The failure characteristics of the specimens under loading protocol 1(main beam end and orthogonal beam end are loaded synchronously) coincide best with those observed during actual earthquakes, where the bearing capacity and ductility are found to be the worst. Compared with the single bar beam-column subassemblie, the ductility behavior of beam-column subassemblies with bundle of bars is reduced significantly. Based on the experimental results, a tri-linear fixed-point restoring force model considering stiffness degradation, strength degradation and pinching effect was established. The model agrees well with the experimental results, which can provide reference for elasto-plastic seismic response analysis of practical engineering structures.

关 键 词：空间梁柱组合体 并筋 空间加载 抗震性能 恢复力模型 

分 类 号：TU375.4[建筑科学—结构工程] TU317.1