改进型钢管混凝土柱-H型钢梁槽形端板节点抗震性能研究
Seismic Performance of Improved Conrete-Filled Steel Tubular Column to H-Shaped Steel Beam Groove End-Plate Joint
为研究方钢管混凝土柱与H型钢梁槽形端板连接节点的抗震性能,对3个槽形端板连接节点和1个普通端板连接节点进行了低周往复加载试验,研究了节点的破坏机理与特征、承载能力、节点区应力分布以及抗震性能等,分析了节点构造参数不同对其抗震性能的影响。在试验研究基础上,采用ABAQUS有限元软件进行了有限元适应性验证和参数分析,对比了槽形端板连接节点和普通端板连接节点承载力、延性和初始转动刚度的差异性。试验研究表明:试件均在端板和梁翼缘连接处出现对接焊缝撕裂以及焊缝附近母材断裂现象,普通端板发生了明显翘曲,与柱翼缘之间出现明显缝隙;试件滞回曲线均呈现梭形,没有明显的捏缩现象,说明具有良好的耗能能力;相较于普通端板连接节点,槽形端板连接节点的极限承载力和初始转动刚度分别平均提高了6.5%和29.7%、延性和耗能能力分别平均下降了16.7%和14.5%,表明采用槽形端板对节点初始转动刚度的影响最显著。建议设计中槽形端板侧面伸出长度取柱宽的一半即可满足要求。
In order to study the seismic performance of concrete-filled square steel tubular column and H-shaped steel beam groove end-plate connection joints, low cyclic loading tests were conducted on three groove end-plate connection joints and one ordinary end-plate connection joint. The failure mechanism and characteristics, bearing capacity, stress distribution and seismic performance of the joints were studied, the influences of different structural parameters on the seismic performance of the joints were analyzed. On the basis of experimental research, the finite element adaptability verification and parametric analyses were carried out using ABAQUS finite element software, and the differences of bearing capacity, ductility and rotational stiffness between groove end-plate connection joints and ordinary end-plate connection joints were compared. Test study showed that the butt weld tore and the base metal near the weld fractured at the connection between the end-plates and beam flanges. The ordinary end-plate warped and exhibited an obvious gap between the end-plate and the column flange. The hysteretic curves of the specimens exhibited spindle-shape without obvious pinching phenomenon, indicating the specimens have good energy dissipation capacity. Compared with the ordinary end-plate connection, the bearing capacity and rotational stiffness of the groove end-plate connection increased by 6.9% and 29.7%, respectively, and the ductility and energy dissipation capacity decreased by 16.7% and 14.5%, respectively. These results indicate that the groove end-plate has the most significant effect on the rotational stiffness of the connection. It is suggested that the side extension length of the groove end-plate should be half of the column width to meet the design requirements.
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国家自然科学基金(51768056)
内蒙古自然科学基金(2019MS05038)
内蒙古自治区高校青年科技英才项目(NJYT22068)
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