T形截面钢管混凝土异形柱-钢梁框架节点地震损伤试验研究  

Experimental study on seismic damage of joints with T-shaped CFST columns and steel beams

作　　者：薛建阳[1,2] 李贺超 陈茜 屠光续 路鑫 钟瑞宝 XUE Jianyang;LI Hechao;CHEN Xi;TU Guangxu;LU Xin;ZHONG Ruibao(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structure and Earthquake Resistance of the Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China;School of Civil Engineering,Henan University of Science and Technology,Luoyang 471000,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]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]河南科技大学土木工程学院,河南洛阳471000

出　　处：《建筑结构学报》2023年第2期129-141,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(51808195);陕西省科技创新团队项目(2019TD-029)。

摘　　要：为研究T形截面钢管混凝土异形柱-钢梁框架节点在不同形式的水平荷载作用下的损伤演化规律,设计并制作了11个缩尺比为1/2的框架节点,设计参数为加载模式(低周往复加载、低周往复-单调混合加载、位移等幅循环加载、单调重复加载)、肢高肢厚比(2、3)和轴压比(0.2、0.3、0.4)。分析了节点的破坏形态、荷载-位移曲线和滞回耗能等特性。结果表明:T形截面钢管混凝土异形柱-钢梁框架节点核心区主要发生剪切斜压破坏,滞回曲线饱满,无明显捏缩效应,破坏时的等效黏滞阻尼系数为0.317~0.396,耗能能力较好;节点耗能能力随轴压比的增大逐渐降低;随着累积耗能和变形的增加,节点的延性逐渐降低;进行位移等幅循环加载时,加载幅值越大,节点的累积损伤发展得越快,破坏时经历的循环次数越少;增加肢高肢厚比可以有效提高节点的承载力和极限变形能力,延缓节点核心区累积损伤的发展。基于试验结果,考虑塑性变形、加载路径和滞回耗能对节点地震损伤的影响,提出了改进的双参数损伤模型,给出了节点在各特征状态下的损伤指数。结果表明,改进模型计算结果与试验结果吻合较好,该模型能较准确地评估T形截面钢管混凝土异形柱-钢梁框架节点的地震损伤。To investigate the seismic damage rule of T-shaped concrete-filled steel tubular(CFST) columns-steel beams joints under different lateral loadings, 11 specimens with the scale ratio of 1/2 were designed and fabricated. The design parameters of the tests were the loading mode(cyclic reversed loading, cyclic reversed and monotonic hybrid loading, cyclic reversed loading with constant amplitude, and monotonic repeated loading), depth to width ratio(2, 3), and axial compression ratio(0.2, 0.3 and 0.4). The failure pattern, load-displacement curves and hysteretic energy dissipation were analyzed. The results reveal that the failure pattern of the joint core area is mainly the shear failure and diagonal compression failure. The hysteretic curves of the joints are plump without a obvious pinch effect, and the joints have good energy dissipation capacity with the equivalent viscous damping coefficient of 0.317~0.396 at the failure point. The energy dissipation capacity of the joints decreases with the increased axial compression ratio. With the increase of hysteretic energy dissipation and deformation, the ductility of the joints decreases gradually. Under cyclic loading with constant amplitude, the larger the amplitude is, the faster the seismic damage of the joints develops, and the fewer loading cycles the joints experience when the specimens fail. Increasing the depth to width ratio can effectively improve the bearing capacity and ultimate deformation of the joints and delay the seismic damage development of the joints gradually. Based on the experimental results, considering the influence of plastic deformation, loading path and hysteretic energy dissipation on the joint seismic damage, a modified two-parameter seismic damage model was proposed and the damage indexes of the joints at the characteristic points were given. It reveals that the calculated results are in good agreement with the experimental results, and the seismic damage of the T-shaped CFST columns-steel beams joints can be accurately evaluated by the

关 键 词：框架节点 钢管混凝土 T形截面柱 拟静力试验 地震损伤 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1