法兰连接方钢管柱-桁架焊接节点抗震性能试验研究  

Tests for aseismic performance of welded joints between flange-connected square steel tube column and truss

作　　者：刘学春[1,2] 王玥 张爱林[1] LIU Xuechun;WANG Yue;ZHANG Ailin(Beijing Municipal Engineering Technology Research Center for High-rise and Long-span Prestressed Steel Structures,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Earthquake Engineering and Structural Retrofit of Beijing,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124 [2]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124

出　　处：《振动与冲击》2021年第19期200-211,260,共13页Journal of Vibration and Shock

基　　金：国家自然科学基金(51678010)。

摘　　要：对桁架梁截面尺寸不同的6个足尺寸法兰连接方钢管柱-桁架焊接连接节点进行了低周反复荷载试验研究和有限元分析(FEA)。该节点通过法兰和高强螺栓将上下柱及柱座在现场连接,柱座与桁架梁通过竖向连接板、法兰和腋板在工厂焊接;该节点应用于装配式多高层钢结构中,实现现场螺栓全装配。试验结果表明:桁架梁截面尺寸对节点的破坏模式影响较小,加腋板节点均由于反复加载导致桁架弦杆发生板材的撕裂而破坏,断裂前发展了良好的塑性变形,未加腋板节点根部焊缝发生断裂;加腋板节点的延性、极限承载力及耗能能力较好,塑性转动能力均大于抗震规范0.03 rad的最低要求。桁架梁截面尺寸对该节点各项力学性能影响显著,弦杆截面尺寸越大,极限承载力越高;腹杆截面尺寸对极限承载力影响较小,腹杆截面尺寸越大,节点延性越好,耗能能力越强;通过有限元软件提取了柱法兰处螺栓拉力的变化,柱柱法兰连接可近似为刚接;推导了节点的屈服荷载和极限荷载的简化计算公式。Here,six full-size welded joints between flange-connected square steel tube column and truss with different beam cross-section sizes were studied through low cycle repeated load tests and finite element analysis(FEA).Upper and lower steel tube columns and column base were connected onsite with flanges and high-strength bolts,and the column base and truss beam were welded in factory with vertical connection plates,flanges and axillary plates to form welded joints.This kind joints could be applied in prefabricated multi-story and high-rise steel structures to realize onsite full assembly with bolts.The test results showed that the cross-section size of truss beam has little influence on the failure mode of joints,the joints with axillary plates are all failed due to repeated loading causing tearing of truss chord members,there are good plastic deformations developed before failure,and the root weld of joints without axillary plate is fractured;joints with axillary plate have better ductility,ultimate load-bearing capacity and energy-dissipation capacity,and their plastic rotating capacity is larger than the minimum requirement of 0.03 rad in aseismic code;truss beam cross-section size significantly affects joints’mechanical performances,the larger the chord section size,the higher the ultimate load-bearing capacity;the section size of web member has little influence on the ultimate load-bearing capacity,the larger the web section size,the better the ductility of joints and the stronger the energy dissipation capacity of joints;the change of bolt tension at column flange is extracted using finite element software,the column-column flange connection can be approximately rigid;the simplified calculation formulas of joints’yield load and ultimate load are derived.

关 键 词：装配式钢结构 法兰连接 抗震性能 桁架梁截面尺寸 极限承载能力 

分 类 号：TU398.9[建筑科学—结构工程]