内置非贯通型钢的钢管约束RC柱抗震性能研究  

Seismic behaviors of steel tubed RC columns with built-in non through section steel

作　　者：赵航 王秋维[1,3] 史庆轩[1,3] 王璐[1] ZHAO Hang;WANG Qiuwei;SHI Qingxuan;WANG Lu(College of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;College of Civil Engineering,Shaanxi Polytechnic Institute,Xianyang 712000,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,西安710055 [2]陕西工业职业技术学院土木工程学院,陕西咸阳712000 [3]西安建筑科技大学结构工程与抗震教育部重点实验室,西安710055

出　　处：《振动与冲击》2022年第22期51-59,136,共10页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51878543,51878540);陕西省教育厅科学研究计划项目(20JS078)。

摘　　要：提出采用内置型钢增强钢管约束钢筋混凝土(steel tubed reinforced concrete, STRC)柱节点的构造方案,为明确节点中内置非贯通型钢STRC柱的受力性能,设计6个不同型钢内置长度STRC柱及2个无型钢柱对比试件,通过低周反复荷载试验及有限元模拟,分析了试件的破坏特征、滞回曲线、骨架曲线、钢管和型钢应变,探讨了型钢内置长度和轴压比对柱抗震性能的影响。结果表明:STRC柱根区域均发生压弯破坏,内置型钢长度对混凝土损伤程度及裂缝开展范围有显著影响,所有试件在加载后期仍具有稳定的承载力;内置型钢对STRC柱承载力及变形能力有不同程度的增强,当内置长度较短时,抗弯性能不易发挥,增大内置长度可提高型钢受弯程度,明显提升试件抗震性能,当内置长度超过一定值后,型钢受弯较充分,性能则趋于稳定;柱根部钢管主要提供横向约束作用,中部钢管主要参与截面抗弯,可占截面总弯矩30%以上;随轴压比的增加,试件承载力提高但延性降低。结合试验数据进行扩参分析,给出了满足组合柱承载力和变形要求的内置非贯通型钢长度建议值。A construction scheme of steel tubed reinforced concrete(STRC) column joints strengthened by built-in section steel was proposed. To clarify the mechanical properties of internal non-through section steel STRC columns in the joints, six STRC columns with different internal length of the section steel and two columns with no section steel were designed. By low cyclic load tests and finite element simulation, the failure characteristics, hysteresis curve, skeleton curve, and the strain of the steel tube and section steel were analyzed, and the effects of the internal length and axial compression ratio of the section steel on the seismic performance of the column were discussed. The results show that bending failure occurs in the root of the STRC column. The length of section steel has a significant influence on the damage degree and crack development range of the concrete. All specimens still have stable bearing capacity at the late loading stage. The bearing capacity and deformation capacity of STRC columns with built-in section steel have been enhanced in various degree. When the built-in length is lesser, the resistant bending effect is not easy to play, but increasing the built-in length can enlarge the bending range of the section steel and significantly improve the seismic resistance of the specimen. When the built-in length exceeds a certain value, the section steel is more fully bent and the performance tends to be stable. The main steel tube mainly provides the lateral constraint effect, while the middle tube is mainly involved in bending resistance of the section, and offers more than 30% of the total bending resistance. With the increases of axial pressure ratio, the bearing capacity of the specimen increases, but the ductility reduces. Combined with the test data, the parameter expansion analysis was carried out, and the suggested value of built-in non-penetrating steel length which meets the requirements of bearing capacity and deformation of composite columns was given.

关 键 词：非贯通型钢 钢管约束钢筋混凝土(STRC)柱 轴压比 低周反复荷载试验 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程]