格构式钢骨-钢管混凝土构件轴压性能试验研究  

Experimental Study on Axial Compression Behaviour of Concrete-filled Steel Tubular Members with Reinforcing Lattice Angles

作　　者：王先铁[1] 李博凡 侯新宇 韩军科 朱彬荣 WANG Xiantie;LI Bofan;HOU Xinyu;HAN Junke;ZHU Binrong(School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;China Electric Power Research Institute,Beijing 100055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]中国电力科学研究院有限公司,北京100055

出　　处：《湖南大学学报（自然科学版）》2022年第1期57-66,共10页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51678474)。

摘　　要：以是否配置纵向加劲肋和格构式钢骨为主要变化参数,对4组共8个不同内部构造形式的钢管混凝土试件进行了轴心受压试验,对比分析了格构式钢骨-钢管混凝土构件和普通钢管混凝土构件的轴压性能.结果表明:与普通钢管混凝土试件相比,内配纵向加劲肋试件的极限承载力提高了4.65%,内配格构式钢骨试件的极限承载力提高了10.53%,同时配置纵向加劲肋和格构式钢骨试件的极限承载力提高了21.12%.各组轴压试件的破坏形态基本一致,以整体失稳变形为主,伴随外钢管不同程度的鼓曲变形.格构式钢骨和内填混凝土在构件中形成小的“核心柱”,“核心柱”可延缓或抑制核心混凝土的裂缝发展,明显提高构件的承载能力和延性.利用有限元软件ABAQUS对格构式钢骨-钢管混凝土构件进行了轴心受压全过程数值模拟分析,明确了各部件的应力发展过程.提出了格构式钢骨-钢管混凝土构件的轴压承载力计算公式,公式计算结果与试验结果吻合较好且总体偏于安全.The axial compression tests of 4 sets of concrete-filled steel tubular(CFST)specimens with different internal details of the longitudinal stiffeners and lattice steels were carried out.The axial compression behaviour of the CFST specimen with reinforcing lattice angles and the ordinary CFST specimen are compared and analyzed.The results show that the ultimate load bearing capacity of the specimen with longitudinal stiffeners,reinforcing lattice angles,and combined longitudinal stiffeners and reinforcing lattice angles is increased by 4.65%,10.53%and 21.12%,respectively,compared with the ordinary CFST specimen.The failure pattern of each specimen is consistent,which is the overall instability accompanied by various local buckling of the steel tube.The small“core column”is composed of the reinforcing lattice angle and infilled concrete,which can delay or inhibit the development of con⁃crete cracks,and significantly improve the load bearing capacity and the ductility of members.The numerical simula⁃tion analysis on the whole process of lattice steel reinforced CFST members under axial compression is conducted.The stress development process of each component of the member is obtained.A formula for calculating the axial bearing capacity of the lattice steel reinforced CFST member is proposed.The calculation results of the formula are in good agreement with the test results,and give a conservative estimation.

关 键 词：钢管混凝土 格构式钢骨 轴压试验 有限元分析 计算公式 

分 类 号：TU392.3[建筑科学—结构工程]