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为了研究中等强度钢材框架梁柱组合节点在地震作用下节点受力性能,在4个足尺试件低周往复荷载作用下的破坏试验中,通过合理的应变片布置和位移测量,得到节点各部位的应力分布情况,包括钢梁下翼缘处、组合梁截面应力发展、预埋钢筋以及钢梁与混凝土的滑移等。从试验结果中可以清楚地看到组合节点钢梁下翼缘焊接孔处存在不同程度的应力集中,截面的应变分布基本满足平截面假定,越接近梁柱截面中轴线的钢筋应变越大,同时塑性发展越明显,继而对其地震作用下的表现有了定性的认识,为组合节点抗震设计以及抗震性能的进一步研究提供了必要的试验基础。
In order to study the mechanical behavior of joints of medium-strength steel frame beam-column joints subjected to earthquake, in the failure test of 4 full-scale specimens under low-cycle reciprocating loads, through reasonable strain gauge arrangement and displacement measurement, The stress distribution of the part, including the lower flange of the steel beam, the stress development of the cross-section of the composite beam, the embedded steel bar and the slip between the steel beam and the concrete. From the test results, it can be clearly seen that there are different degrees of stress concentration at the welded hole of the lower flange of the composite node. The strain distribution in the section basically meets the assumption of the flat section. The greater the strain of the rebars closer to the central axis of the beam column, The more obvious plasticity develops, and then a qualitative understanding of its performance under seismic action provides the necessary experimental foundation for the further study on seismic design of composite joints and seismic performance.