间隙与支座类型对开孔三重钢管防屈曲耗能支撑性能的影响

Effects of gaps and bearing types on performance of perforated triple-steel tube buckling-restrained brace

利用ABAQUS有限元分析软件对开孔三重钢管防屈曲耗能支撑进行拉压循环荷载作用下的滞回性能、支撑的承载力及核心管的应力和变形进行模拟分析,研究了核心管与内外约束管之间的间隙和支撑的支座类型对支撑性能的影响。研究结果表明：当间隙为0 mm时,防屈曲耗能支撑在加载过程中出现套箍效应和整体屈曲现象;当间隙为1-2 mm时,加载过程中不出现套箍效应和屈曲现象;当间隙大于3 mm时,三钢管出现明显的弯曲,建议支撑的间隙控制在1-2 mm之间;当支座类型为铰接时,支撑还没屈服就已经屈曲;当支座类型为半刚接时,加载到38 mm时支撑发生屈曲;当支座类型为刚接时,支撑在加载的过程中不出现屈曲现象,在设计的过程中按铰接考虑是偏于安全的。

In this paper,based on the ABAQUS software,the authors carry out the finite element analysis consisting of hysteretic performance under pseudo static cyclic load,bearing capacity,stress and deformation of the core of perforated triple-steel tube buckling-restrained brace.The influences of gaps between the core and inner or outer tube and bearing types on the performance of the perforated triple-steel tube buckling-restrained brace are studied.The results show that when the gas is 0 mm,the ＂confinement effect＂ and complete buckling appear in the perforated triple-steel tube buckling-restrained brace during the loading process.When the gas is 1-2mm,the ＂confinement effect＂ and complete buckling do not appear during the loading process.When the gas is more than 3mm,obvious bends of three tubes appear.The authors suggest that the gaps would be 1-2mm.When the bearing type is pin connection,the BRB would be buckled before yielding.When the bearing is semi-rigid joint,the core would be buckled when the displacement reaches 38mm.When the bearing is rigid joint,the core would not be buckled during the loading process.In the process of the design,bearing considered to be pin connection is safe.