【作者】 邵永波；

【Author】 SHAO YONG-BO School of Civil Engineering,Yantai University,Yantai,Shandong Province,264005,China

【机构】 烟台大学土木工程学院；

【摘要】 空心钢管由于在径向的刚度一般远小于轴向刚度,所以当主管承受支管轴向方向传递来的作用力时,在主管表面靠近焊缝部位容易发生局部屈曲。在动力作用下,主管表面的反复屈曲会造成焊缝处萌生裂纹,随着裂纹的不断扩展导致节点发生破坏。通过将节点部位主管管壁厚度增大的方法,可以将主管表面的屈曲破坏转换为主管不同厚度连接处的剪切破坏,从而将原来的脆性破坏转换为塑性破坏。基于建立的有限元模型,分析了未加固和加固的T型方钢管节点在反复荷载作用下的滞洄性能,通过比较两者的滞洄曲线发现采用主管管壁加厚的方钢管节点的滞洄曲线更饱满,滞洄环包围的面积明显增大,说明加固后的方钢管节点能够更好地抵抗动力荷载,如地震等,为方钢管的抗震设计提供参考方法。更多还原

【Abstract】 Due to the fact that the radius stiffness of a hollow section tube is generally much smaller than its stiffness in axial direction,the outer surface of the chord near the weld is easily buckling when it is subjected to the load along the axial direction of the brace.Under dynamic loading,the cyclic buckling of the chord surface may cause the initiation and propagation of crack.The tubular joint then becomes to fail with the development of the crack.Through reinforcing the chord tube-thickness,it is possible to change the buckling failure to shear yielding failure,and thus ductile failure can replace brittle failure.Based on the finite element model,the un-strengthened and strengthened squared T-joints models are analyzed.The hysteretic behaivour of these models are then obtained.From the finite element results,it is found that the area of the hysteretic curves of the strengthened tubular joints is much bigger than the area of the hysteretic curves of the un-strengthened models. Thus,the joints reinforced with tube-thickness are advantageous in resisting dynamic loading,such as earthquake loading.The presented results can provide design methods for seismic resistance of tubular structures.更多还原