基于ABAQUS对自复位防屈曲支撑简化模型的验证与参数分析

Verification and Parameter Analysis of a Simplified Model for Self Resetting Buckling Restrained Brace Based on ABAQUS

防屈曲支撑在大震下不易屈曲且耗能能力优秀,现广泛用于高烈度地区结构。但其耗能机制导致支撑震后残余变形过大,不利于震后修复工作的开展。故对防屈曲支撑增设自复位系统,以大幅度降低其残余变形。但是,自复位防屈曲支撑独特的“旗形”滞回模型导致其模型复杂且计算量过大,不便应用于实际工程中。针对以上问题,首先通过杆单元和非线性弹簧叠加建立了自复位防屈曲支撑简化模型并验证了该简化模型的可行性。在此基础上,通过参数分析得到了各类实际参数取值对自复位防屈曲支撑承载力、自复位能力的影响效果。

Buckling restrained brace is not prone to buckling under strong earthquakes and have excellent energy dissipation capabilities.They are now widely used in structures in high-intensity areas.However,its energy dissipation mechanism leads to excessive residual deformation of the support after the earthquake,which is not conducive to the development of post earthquake repair work.Therefore,a self resetting system is added to buckling restrained brace to significantly reduce its residual deformation.Due to the unique"flag shaped"hysteresis model of self resetting buckling restrained brace,its model is complex and computationally intensive,making it inconvenient to apply to practical engineering problems.This article addresses the above issues by first establishing a simplified model of self resetting buckling restrained brace through the superposition of rod elements and nonlinear springs,and verifying the feasibility of the simplified model.On this basis,this article obtained the influence of various actual parameter values on the bearing capacity and self resetting ability of self resetting buckling restrained brace through parameter analysis.