矩形钢管柱与矩形钢管桁架螺栓连接节点力学性能分析

MECHANICAL PROPERTIES ANALYSIS OF RECTANGULAR STEEL TUBULAR COLUMN AND RECTANGULAR STEEL TUBULAR TRUSS BOLTED JOINT

为了研究未在柱上设置加劲肋的矩形钢管柱与矩形钢管桁架螺栓连接节点的静力性能以及影响因素,采用通用有限元分析软件ANSYS,针对3种柱截面高度及两种连接板厚度组合出的6组节点进行非线性分析。结果表明,此类节点通过在柱上局部外包加厚钢板,能有效得桁架上荷载传递到矩形钢管柱上,桁架下弦与矩形钢管柱连接处未出现明显局部失稳的现象,在充分加载后出现的两种主要破坏模式为下弦连接板平面外失稳及矩形钢管柱形成塑性铰,当下弦连接板厚度较薄而矩形钢管柱截面高度较大时,出现的破坏模式为下弦连接板平面外失稳,而当下弦连接板较厚而矩形钢管柱高度较小时,出现的破坏模式为矩管柱出现塑性铰。

To investigate the static performance and influence factors of the rectangular steel pipe column and the rectangular steel pipe truss bolt joint without stiffened rib on column,the nonlinear analysis of 3 types of column section height and 6 groups of joints with two connection plate thicknesses was carried out by using the finite element analysis software ANSYS. The results showed that the loads on the truss could be effectively transferred to the column after the steel plate was locally arranged on the column. The phenomenon of local instability of the connection between the lower string of the truss and the column was not obvious under loads. The main damage modes were the out-of-plane buckling of the lower string connection plate or the plastic hinge formed on the column. When the thickness of the lower string connection plate was thinner and the height of the column section was greater,the destructive mode was the out-of-plane buckling of the lower string connection plate. When the string connection plate was thicker and the height of the column section was smaller,the damage mode was the plastic hinge formed on the column.