型钢高强混凝土柱破坏模式与变形特征研究  

Failure modes and deformation characteristics of steel reinforced high-strength concrete columns

作　　者：孙悦 朱伟庆[1] 贾金青 龙刚 SUN Yue;ZHU Weiqing;JIA Jinqing;LONG Gang(School of Highway,Chang'an University,Xi'an 710064,China;Faculty of Infrastructure Engineering,Dalian University of Technology,Liaoning Dalian 116024,China;Xi'an Huantong Municipal Engineering Project Management Co.,Ltd.,Xi'an 710038,China)

机构地区：[1]长安大学公路学院,西安710064 [2]大连理工大学建设工程学部,辽宁大连116024 [3]西安环通市政工程项目管理有限公司,西安710038

出　　处：《内蒙古工业大学学报（自然科学版）》2024年第4期351-359,共9页Journal of Inner Mongolia University of Technology：Natural Science Edition

基　　金：陕西省高校科协青年人才托举计划(20180409);陕西省自然科学基础研究计划项目(2019JM-172);长安大学中央高校基本科研业务费专项资金项目(300102212912)。

摘　　要：开展了4根不同轴压比和箍筋间距的型钢高强混凝土(SRHC)柱的拟静力试验,分析了不同设计参数时SRHC柱的破坏模式的差异。采用有限元软件建立了SRHC柱的有限元模型,在此基础上分析了不同破坏模式时SRHC柱的变形特征以及各设计参数的影响。研究结果表明:剪跨比为3.0的SRHC柱在往复加载初期均表现为以弯曲破坏为主,但轴压比较大或箍筋间距较大的SRHC柱最终发生弯剪破坏。发生弯曲破坏的SRHC柱的滞回曲线更加饱满,骨架曲线下降段更平缓,位移延性系数和极限弹塑性位移角更大,变形能力更强。对于发生弯剪破坏的SRHC柱,轴力更大或箍筋间距更大时,滞回曲线的耗能面积更小,强度和刚度退化更明显,骨架曲线下降段更陡峭,位移延性系数和极限弹塑性位移角更小,变形能力更差。当破坏模式不同时,弯曲变形和剪切变形占总变形的比例也有所不同,发生弯剪破坏的SRHC柱的剪切变形占比较发生弯曲破坏时更大。The proposed static tests of four steel-reinforced high-strength concrete(SRHC)columns with different axial compression ratios and hoop spacing were carried out to analyze the differences in the damage modes of SRHC columns with different design parameters.The finite element model of SRHC columns was established by using finite element software,based on which the deformation characteristics of SRHC columns with different damage modes and the effects of each design parameter were analyzed.The results show that the SRHC columns with a shear-to-span ratio of 3.0 were mainly damaged in bending at the beginning of reciprocal loading,but the SRHC columns with larger axial compression ratios or larger spacing of the hoop reinforcement eventually suffered bending-shear damage.The SRHC columns with bending damage had fuller hysteresis curves,smoother descending sections of the skeleton curves,larger displacement ductility coefficients and ultimate elastic-plastic displacement angles,and stronger deformation capacities.For SRHC columns with bending-shear damage,the energy dissipation area of the hysteresis curve is smaller,the strength and stiffness degradation are more obvious,the descending section of the skeleton curve is steadier,the displacement ductility coefficients and ultimate elastic-plastic displacement angles are smaller,and the deformation capacity is poorer when the axial force is larger or the hoop spacing is larger.When the failure modes are different,the proportions of bending deformation and shear deformation in the total deformation are also different.The shear deformation of SRHC columns that experience combined bending-shear failure is greater compared to when bending failure occurs.

关 键 词：型钢高强混凝土柱 破坏模式 变形特征 拟静力试验 有限元模型 

分 类 号：TU398.9[建筑科学—结构工程] U443.2[建筑科学—桥梁与隧道工程]