【摘要】 钢框架刚性节点在加腋后可以有效地改善其抗震性能。通过建立钢框架加腋节点的有限元模型,分析了地震荷载作用下的应力分布规律,提出了新的钢框架加腋节点简化计算模型,并与有限元分析结果和以往模型进行了对比,在此基础上用解析方法阐释了钢框架加腋节点的作用机理,结果表明:所提简化模型简单有效,且具有较高的精度,梁的跨高比对加腋节点性能具有重要影响,加腋并非对所有钢框架刚性节点都有效,文中给出了加腋节点的适用范围,只有适用范围内的钢节点才能通过加腋使塑性铰从节点外移,避开梁柱连接面的焊缝,从而提高其抗震性能。适用范围外的节点即使加腋仍可能发生节点焊缝的脆性破坏,但是破坏的位置从梁柱连接面的梁下翼缘焊缝转移到梁上翼缘焊缝处,此处是加腋后的薄弱部位。更多还原

【Abstract】 The seismic performance of the steel moment connection with welded haunch(SMCWH) can be much improved compared with the connection without welded haunch.Firstly,a finite element model of SMCWH is established and the stress distribution is analysed for the SMCWH subjected to ground motions.A new simplified model is developed to calculate the SMCWH.The result of new model is compared with the finite element analysis results and past model results.The load carrying mechanism of SMCWH is discussed based on the new simplified model.It can be concluded that the simplified model is simply and reliable to use in practice.The span-depth ratio has an important effect on the seismic perfomance of SMCWH.the welded haunch is not applicable for all moment connections.In this paper,the applicable range is provided.The welded haunch can improve the seismic performance of steel connections by moving plastic hinge away from the groove weld between the beam flanges and the column flange only for SMCWH within the range.For SMCWH out of the range,the welded haunch can not prevent brittle fracture in or around the groove weld between the beam flanges and the column flanges,though the position of brittle fracture changed to the groove weld of beam top flange.更多还原