支撑自复位能力对框架节点受力性能的影响

Influence of self-centering ability of brace on mechanical performance of frame connections

自复位防屈曲支撑是一种新型耗能装置,可以有效减小结构的残余变形。通过研究支撑复位系统影响因素,确定复位参数,建立支撑框架节点有限元模型,分析支撑复位程度对支撑、节点板和梁柱受力性能的影响规律,获得支撑框架节点的作用机制。结果表明,支撑复位率为0≤α≤1.0时,结构最大层间位移角由1/60逐渐减小至1/2413,支撑的复位能力明显增大;梁柱节点处塑性损伤最大提高了20.06%;节点板应力变化显著,其应力先迅速增长8.12%,后又缓慢提高4.02%,总体呈上升趋势。

This paper aims to research a new energy dissipation device named self-centering buckling-restrained brace,which could reduce the residual deformation of structure effectively.The study involves investigating the influence factors of the braced reset system,determining the reset parameters,establishing the finite element model of braced frame connection,analyzing the influence law of braced reset degree on the mechanical properties of braced,gusset plate,beam and column,and obtaining the action mechanism of braced frame node.The results show that the bracing reset ability increases obviously along with decreases of the maximum interlayer displacement angle from 1/60 to 1/2413,while bracing reset ratio is 0≤α≤1.0;the maximum plastic damage at the beam-column connection increases by 20.06%;the obvious changes from stress of gusset plate show an upward trend overall,with a initial rapid increase in stress by 8.12%,and a subsequent slow increase by 4.02%.