预应力型钢混凝土梁-钢管混凝土叠合柱框架节点抗震性能试验研究  

Test on hysteretic behavior of prestressed steel reinforced concrete beam to steel-tube reinforced concrete column joints

作　　者：王琨[1,2] 智海祥 曹大富 史高林[1] WANG Kun;ZHI Haixiang;CAO DafuI;SHI Gaolin(College of Civil Science and Engineering,Yangzhou University,Yangzhou 225127,China;Hunan Province Engineering Laboratory of Bridge Structure,Changsha University of Science ＆ Technology,Changsha 410015,China)

机构地区：[1]扬州大学建筑科学与工程学院,江苏扬州225127 [2]长沙理工大学桥梁结构安全控制湖南省工程实验室,湖南长沙410015

出　　处：《建筑结构学报》2018年第12期29-38,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51508495,51578478);长沙理工大学桥梁结构安全控制湖南省工程实验室开放基金资助项目(16KD01);扬州大学优秀青年骨干教师资助项目(2016)

摘　　要：为研究预应力型钢混凝土梁-钢管混凝土叠合柱框架节点的抗震性能和破坏机理,开展了3个施加预应力及1个未施加预应力型钢混凝土梁-钢管混凝土叠合柱组合框架节点在柱顶水平荷载下的低周往复加载试验,考察了组合框架节点在不同预应力水平和轴压比下的破坏过程及破坏形态,研究了节点的承载力、刚度、延性、耗能能力及变形性能,分析了节点核心区箍筋和钢管、梁端纵筋和型钢翼缘、以及柱端纵筋和钢管的应变变化规律。研究结果表明：预应力节点试件均发生梁端先受弯破坏、核心区后剪切破坏的混合破坏模式,而非预应力节点试件仅发生了梁端弯曲破坏;组合框架节点水平荷载-位移滞回曲线饱满,具有良好的耗能能力和延性;预应力水平的增加能延缓梁受拉区裂缝的产生,并提高了节点试件的水平承载力;轴压比对节点试件水平承载力的影响有限,但会在一定程度上降低节点试件的延性和耗能能力;预应力水平和轴压比的增加均降低了节点核心区的剪切变形。研究结果可为此类新型结构在地震区的推广应用提供技术支撑。In order to investigate the seismic performance and failure mechanism of prestressed steel reinforced concrete beam to steel-tube reinforced concrete column joints, three prestressed and one non-prestressed steel reinforced concrete beam to steel-tube reinforced concrete column joints were tested under low cyclic lateral loading. The testing process and failure mode were observed under different prestressing level and axial compressive ratio, and the bearing capacities, stiffness, ductility, energy dissipation capacity as well as deformation performance were studied. In addition, the stress variations of steel tube and stirrups in the panel zone, the longitudinal bars and I-shaped steel at the end of beams, and the longitudinal bars and steel tube at the end of columns were analyzed. The test results indicate that, for the three prestressed specimens, a mixed failure pattern of bending failure at the end of beam occurs first, followed by the shear failure in the panel zone. However, the non-prestressed joint failed at the beam ends. The lateral load-displacement hysteretic curves of the tested specimens show a plump shape with good energy dissipation capacities and ductilities. The cracks in the tensile zone at the ends of the beams could be delayed and the lateral load capacity could be increased with the increase of prestressing level. The increase of axial compression ratio lead to only a small change in the lateral load capacity, but could lead to significant decreases of the ductility and energy dissipation capacity. The increase of the prestressing level and the axial compression ratio decreases the shear deformation of panel zone. The research can provide technical support for the application of the new type of struction in seismic area.

关 键 词：预应力型钢混凝土梁 钢管混凝土叠合柱 节点 低周往复试验 抗震性能 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1