斜向水平荷载作用下高强钢筋混凝土柱的抗震性能  

Seismic behavior of high strength reinforced concrete columns under oblique horizontal load

作　　者：田甜[1] 侯瑶[1] 舒小悦 吴克凡 Tian Tian;Hou Yao;Shu Xiao-yue;Wu Ke-fan(Changchun University of Architecture&Civil Engineering,Changchun 130604,China;Jilin University,Changchun 130012,China)

机构地区：[1]长春建筑学院,吉林长春130604 [2]吉林大学,吉林长春130012

出　　处：《工程抗震与加固改造》2023年第4期24-33,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(50978168);吉林省自然科学基金(20170101252JC)。

摘　　要：为了提升斜向水平荷载作用下钢筋混凝土结构的抗震性能,共设计了7组矩形截面的钢筋混凝土柱,研究了加载方向、轴压比和约束方式对钢筋混凝土柱破坏形貌、滞回曲线、骨架曲线和刚度退化曲线的影响。结果表明,相对斜向加载NC-2试件,主轴加载NC-1试件的滞回曲线更为饱满、峰值荷载较大、强化退化更快,屈服荷载 F_(y)、极限荷载F_(u)和延性系数平均值μ_(ave)相对更大,表明斜向荷载作用下试件的承载能力和变形能力相对较低;轴压比越大试件的峰值荷载越高、到达峰值荷载后的斜率下降速率越大, F_(y)和F_(u)越大、μ_(ave)越小,表明轴压比更大的钢筋混凝土试件的承载能力越大,而变形能力有所减弱;局部区格约束试件C-3的滞回曲线与未约束试件NC-4差别较小,且峰值荷载相对未约束试件NC-4更小、到达峰值荷载后的斜率下降速率相对更快, F_(y)、F_(u)和μ_(ave)相对未约束试件NC-4更小;外包铁板网/碳纤维布约束的C-1/C-2试件的 F_(y)、F_(u)和μ_(ave)相对未约束试件NC-4增大,滞回曲线更加饱满、峰值荷载越大,表明外包铁板网/碳纤维布约束可以有效提升试件的承载能力和变形能力。In order to improve the seismic performance of reinforced concrete structures under oblique horizontal load,seven groups of reinforced concrete columns with rectangular section are designed.The effects of loading direction,axial compression ratio and restraint mode on the failure morphology,hysteretic curve,skeleton curve and stiffness degradation curve of reinforced concrete columns are studied.The results show that,compared with NC-2 specimen under oblique loading,the hysteretic curve of NC-1 specimen loaded by spindle is fuller,the peak load is larger,the strengthening degradation is faster,and F_(y),F_(u) andμ_(ave) are larger,indicating that the bearing capacity and deformation capacity of the specimen under oblique loading are relatively low;The greater the axial compression ratio,the higher the peak load of the specimen,the greater the slope decline rate after reaching the peak load,the greater F_(y)&F_(u) and the smallerμ_(ave),indicating that the greater the axial compression ratio,the greater the bearing capacity of the reinforced concrete specimen,and the weaker the deformation capacity;The hysteretic curve of local lattice constrained specimen C-3 is less different from that of unconstrained specimen NC-4,and the peak load is smaller than that of unconstrained specimen NC-4,the slope decline rate after reaching the peak load is relatively faster,and F_(y),F_(u)andμ_(ave) are smaller than that of unconstrained specimen NC-4;The F_(y),F_(u) andμ_(ave) of C-1/C-2 specimens constrained by iron mesh/carbon fiber cloth increase compared with NC-4 of unconstrained specimens,the fuller the hysteretic curve and the greater the peak load,indicating that the restraint of iron mesh/carbon fiber cloth can effectively improve the bearing capacity and deformation capacity of specimens.

关 键 词：斜向水平荷载 钢筋混凝土 影响因素 破坏形貌 抗震性能 

分 类 号：TU375[建筑科学—结构工程]