轴压比对内置新型钢骨混凝土柱抗震性能的影响  

nfluence of axial compression ratio on seismic performance of built-in new steel reinforced concrete columns

作　　者：刘奕 唐从荣 吴志刚 LIU Yi;TANG Congrong;WU Zhigang(Nanjing Branch of Jiangsu Union Technical Institute,Nanjing 210003,China;Jiangsu Xilinghui Construction Engineering Co.Ltd.,Nanjing 210006,China;Jiangsu Xincheng Construction Co.Ltd.,Nanjing 210015,China)

机构地区：[1]江苏联合职业技术学院南京分院,江苏南京210003 [2]江苏禧令辉建设工程有限公司,江苏南京210006 [3]江苏辛成建设有限公司,江苏南京210015

出　　处：《新型建筑材料》2023年第11期156-159,共4页New Building Materials

摘　　要：为研究轴压比对带T形钢内置钢管混凝土柱抗震性能的影响,使用ABAQUS软件对已有试验进行建模分析,通过滞回曲线、骨架曲线、极限承载力等指标验证模型可靠性,并进行不同轴压比的拓展分析。结果表明:模型试件的滞回曲线加载和卸载刚度与试验结果基本一致,骨架曲线基本吻合,延性系数、正负向水平荷载的误差在5%以内,所模拟的试件在柱脚出现了与试验一致的应力集中和混凝土压溃损伤;应力分析和机理分析表明,纵筋和受压/拉侧T形钢对核心混凝土约束较大,内部钢骨主要提供抗侧刚度;随轴压比的增大,试件由受弯破坏转变为压剪破坏,抗剪承载力最大退化了10%左右,而延性系数最大退化了51.9%。试件的临界轴压比为0.7~0.8,建议在0.7以下进行设计。In order to study the impact of axial compression ratio on the seismic performance of embedded steel tube concrete columns with T-shaped steel,ABAQUS finite element analysis software was used to model and analyze existing experiments.The reliability of the model was verified through indicators such as hysteresis curve,skeleton curve,and ultimate bearing capacity.Expansion analysis of different axial compression ratios was conducted on the basis of the verified model.The results show that the loading and unloading stiffness of the hysteresis curve of the model specimen are basically consistent with the experimental results,the skeleton curve is basically consistent,and the error of the ductility coefficient and positive and negative horizontal loads is within 5%.The simulated specimen exhibits stress concentration and concrete crushing damage at the column foot that is consistent with the experimental results;Stress analysis and mechanism analysis indicate that longitudinal reinforcement and compression/tension side T-shaped steel have significant constraints on the core concrete,while internal steel ribs mainly provide lateral stiffness.As the axial compression ratio increases,the specimen undergoes a transition from flexural failure to compressive shear failure,with a maximum degradation of about 10%in shear capacity and 51.9%in ductility.The critical axial compression ratio of the specimen is between 0.7 and 0.8,so it is recommended to design below 0.7.

关 键 词：新型钢骨 轴压比 抗震性能 有限元分析 

分 类 号：TU375.3[建筑科学—结构工程]