平板型铝合金格栅结构支座节点的承载性能  

Load-bearing behavior of bearing joint of flat aluminum alloy lattice structures

作　　者：陈伟刚[1,2] 邓华[1,2] 白光波[1,2] 董石麟[1,2] 朱忠义[3] 

机构地区：[1]浙江大学空间结构研究中心,浙江杭州310058 [2]浙江省空间结构重点实验室,浙江杭州310058 [3]北京市建筑设计研究院有限公司,北京100045

出　　处：《浙江大学学报（工学版）》2016年第5期831-840,共10页Journal of Zhejiang University：Engineering Science

摘　　要：通过有限元分析与足尺试验考察平板型铝合金格栅结构支座节点的承载性能.加载试验揭示了支座节点的位移、应变发展特点及破坏模式.有限元分析给出了支座节点中的杆件、环槽铆钉及盖板的应力分布状况.研究表明:支座节点的破坏为位于工字铝受拉翼缘的最外排铆钉孔处发生断裂;与受拉翼缘连接的下盖板存在传递路径明显的高应力区,但由于分布区域较窄并未导致盖板破坏,而上盖板的应力要低很多;受拉翼缘断裂截面处的环槽铆钉处于最不利的拉弯受力状态,但并未发生破坏;当杆件断裂时,承受的极限弯矩约为纯弯状态下强度设计值的0.9倍,剪弯比可达0.3;节点的有限元结果与试验结果吻合较好,反映了数值模拟方法的有效性.The load-bearing behaviors of bearing joint of flat aluminum alloy lattice structures were investigated by means of finite element analysis and full-scale experiment.The loading test revealed the characteristics of displacement and strain developments of the bearing joint as well as its damage modes.By adopting the finite element analysis,the stress distributions respectively in members,lockbolts and cover plates of the bearing joint were presented.Results show that the outermost row of bolt holes on the tensile flange of aluminum alloy I-beams ruptures and causes the damage of the bearing joint.An obvious high-stress zone exists on the lower cover plate connected with the tensile flange though it is too narrow to induce the fracture of cover plates,while stresses on the upper cover plate are much smaller.The lockbolts in the fracture section of the tensile flange lie in the most unfavorable tensile-bending state,but no damage happens.When the fracture appears in the I-beam,the corresponding ultimate moment is approximately 0.9times the design strength of aluminum I-beams under pure bending,and the moment-shear ratio reaches0.3.The results of numerical analysis well coincide with those of the loading test,indicating the validity of the suggested numerical simulation method.

关 键 词：铝合金结构 平板格栅 支座节点 断裂破坏 有限元分析 

分 类 号：TU395[建筑科学—结构工程]