应变硬化率对屈曲约束支撑框架残余变形影响的概率评估

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英文篇名：Probabilistic Assessment of Strain Hardening Ratio Effect on Residual Deformation Demands of Buckling-Restrained Braced Frames 中文刊名：钢结构 英文刊名：Steel Construction 中文关键词：BRBFs ; 应变硬化率 ; PSDA ; 残余侧移 ; 地震需求 英文关键词：BRBFs ; Strain hardening ratio ; PSDA ; Residual drift ; Seismic demand 出版日期：2015-01-22 年：2015 期：01 出版单位：钢结构

摘要

采用概率地震需求分析(PSDA)方法,评估核心型钢应变硬化率对屈曲约束支撑框架(BRBFs)残余侧移的影响。结果表明,应变硬化率变化仅为1%时,框架低层和中间层的残余侧移显著增加,BRBFs的恢复能力显著减小。另一方面,最大侧移与应变硬化率近似相互独立。震后出现较大永久侧移会对结构的性能带来严重影响,因此,准确的材料试验对结构安全十分重要。
In this study the effect of steel core strain hardening ratio of Buckling-Restrained Braces(BRBs)on residual drift demands of Buckling-Restrained Braced Frames(BRBFs)was assessed by using Probabilistic Seismic Demand Analysis(PSDA)methodology.Results show that by mere 1% change in strain hardening ratio,the residual drift demands of low and medium-rise studied frames experienced significant increment and restoring ability of BRBFs reduced meaningfully.On the other hand,maximum drift demands were approximately independent from strain hardening ratio.Given that,the large permanent drifts can make serious serviceability issues after earthquakes,accurate material tests play an important role in structural safety.

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