分级屈服型防屈曲支撑框架结构抗震性能

Seismic performance of graded yielding buckling-restrained braced frame structure

为了解决普通防屈曲支撑(buckling-restrained brace,BRB)在多遇地震下不耗能的问题,提出了一种分级屈服型防屈曲支撑(double-stage yielding buckling-restrained brace,DYBRB)。首先介绍了DYBRB的构造与原理,并对其进行了理论分析;然后采用ABAQUS有限元软件对DYBRB进行了性能分析;最后建立了分级屈服型防屈曲支撑框架(double-stage yielding buck-ling-restrained braced frame,DYBRBF)结构与普通防屈曲支撑框架(buckling-restrained braced frame,BRBF)结构的有限元模型,对二者在多遇及罕遇地震下的抗震性能进行了对比分析。结果表明:本文推导的理论公式精确度较高,可用于DYBRB的初步设计;DYBRB滞回曲线饱满,分级屈服特征明显,其延性与等效黏滞阻尼比较大,耗能能力优良;在多遇及罕遇地震作用下,DYBRBF结构最大层间位移角相较于BRBF结构均减小,DYBRB的滞回曲线较BRB更饱满,耗能能力更优。

In order to solve the problem that ordinary buckling-restrained brace(BRB)cannot dissipate energy under frequent earthquakes,a double-stage yielding buckling-restrained brace(DYBRB)was proposed.Firstly,the configuration and principle of DYBRB were explained,and the theories of DYBRB were investigated.Secondly,the performances of DYBRB were analyzed by ABAQUS.Finally,the finite element models of the double-stage yielding buckling-restrained braced frame(DYBRBF)struc-ture and the buckling-restrained braced frame(BRBF)structure were established,and the seismic performances of them were compared under frequent and rare earthquakes.The results indicate that the theoretical formulas are accurate and they can be used in the preliminary design of DYBRB.The hysteretic curves of DYBRB have a full shape with obvious double-stage yielding char-acteristic.The ductility and equivalent viscous damping ratio of DYBRB are large,and the energy dissipation capacity of DYBRB is good.Under frequent and rare earthquakes,the maximum inter-story drift angles of DYBRBF structure are smaller than those of BRBF structure.The hysteretic curves of DYBRB are fuller than those of BRB and the energy dissipation capacity are better.