一种新型装配式钢结构节点的力学性能研究

Study on mechanical performances of a new prefabricated steel structure node

Con XL节点是一种施工快速、标准化制造、绿色环保的新型装配式节点。根据国内《钢结构设计规范》(GB 50017—2003),对节点的螺栓间距和位置进行重新布置,利用ABAQUS进行非线性有限元分析,考察改进后装配式节点在低周反复荷载作用下的力学性能及柱壁厚度、翼缘套板厚度、翼缘连接板厚度和梁端圆弧削弱深度这4个参数对该新型梁柱装配式节点受力性能的影响。研究结果表明,新型装配式节点具备良好的抗震性能和耗能能力。根据有限元分析结果对该新型节点的设计给出建议:柱壁厚度的增加能较明显改善节点受力状况,方钢管柱截面高厚比取22~25较为合适;翼缘套板厚度与钢梁翼缘厚度比值不应大于3.4;梁端圆弧削弱深度与钢梁翼缘宽度比值应控制在0.20~0.22之间。

ConXL node is a kind of new prefabricated node with rapid construction, standardized manufacturing and environmental protection. According to the Code for design of steel structures （ GB 50017-2003 ） , the bolt spacing and location of nodes were rearranged, and ABAQUS was used to conduct nonlinear finite element analysis to examine the mechanical performances of the improved fabricated nodes under low cyclic loading, as well as the influences of column thickness, flange plate thickness, flange connection plate thickness and the weaken are depth of beam end on the mechanical performances of the new beam-column prefabricated node. Research results show that the new prefabricated node has good seismic performance and energy dissipation ability. According to the results of finite element analysis, suggestions were given for the design of the new node： increase of column wall thickness can obviously improve the mechanical state of the node, and the height-thickness ratio of square steel pipe column section should be 22 - 25 ; the thickness of the flange plate should be no more than 3. 4 times of the thickness of the steel beam flange; the ratio of weaken arc depth of beam end and flange width of beam should be controlled between 0.20 to 0.22.