非切削防屈曲支撑破坏机理分析

Analysis of failure mechanism of non-cutting buckling-restrained braces

为检验非切削防屈曲支撑(NBRB)的构造和抗震性能,本文对非切削构造进行了ANSYS有限元塑性静力分析,并与切削构造进行力学性能对比,明确了其受力特点及薄弱环节;在有限元分析的基础上,对所设计的试件进行了低周反复加载静力试验。结果表明:由于焊缝的存在,非切削防屈曲支撑更容易在该截面发生强度或失稳破坏,对焊接质量提出更高的要求;试件荷载-位移滞回曲线稳定、饱满、对称;非切削防屈曲支撑构造合理,具有良好的耗能性能和抗低周疲劳性能,是一种新型的耗能支撑。

To test the construction and seismic performance of the non-cutting buckling-restrained braces（NBRB）,the ANSYS finite element elastoplastic static analysis was made for the non-cutting structure,the non-cutting structure was compared with cutting structure in terms of mechanics properties,and stress characteristics and weakness of the NBRB were verified;On the basis of the finite element analysis,a low-cycle loading static test for the designed parts was conducted repeatedly.The result showed that,because of the existence of weld seam,strength failure and stability loss of NBRB occur more easily at this section,thus higher requirement is put forward for the welding quality;The load-displacement curve of NBRB is stable,energetic and symmetrical.This NBRB is a new type of energy dissipation brace,which has a reliable construction with high energy dissipation ability and low-cycle fatigue resistance performance.