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为研究隔板贯通方钢管柱-H型钢梁异型节点强震灾变机理和延性节点构造,对常规异型节点进行了低周往复循环加载试验和基于结构钢椭球面断裂模型及偶联的椭球面屈服模型的断裂分析.结果显示,常规异型节点在大截面梁翼缘对接焊缝边缘开裂,节点的塑性转角约为0.015rad,达不到FEMA要求的0.03rad.提出隔板圆弧扩大头节点构造并进行数值分析,结果表明,扩大头构造消除了对接焊缝沿梁翼缘宽度的几何突变,降低了对接焊缝的应力集中程度和脆断风险,塑性转角均达到了0.03rad,承载力较常规异型节点提高15.9%~39%.
In order to study the mechanism of catastrophic failure and the structure of ductile joints of square steel tubular columns with H-beam at the base of pierced square bulkhead, low-cycle reciprocating cyclic loading tests and ellipsoid-based fracturing models of conventional shaped nodes were carried out. Fracture Analysis of Spherical Yield Model The results show that the conventional shaped joints are cracked on the edge of the butt weld of the flange of the large section beam with the plastic hinge angle of about 0.015 rad which can not meet the requirement of FEMA of 0.03 rad. The numerical results show that the enlarged head structure eliminates the geometric variation of the width of the butt weld along the beam flange, reduces the stress concentration and the risk of brittle fracture of the butt weld, and the plastic rotation angle reaches 0.03 rad, Node increased by 15.9% to 39%.