循环荷载作用下铝合金耗能支撑本构关系

Constitutive Relation of Aluminium Alloy Energy Dissipation Braces at Cyclic Loading

基于国产铝合金材料研制防屈曲耗能支撑构件,并进行了拟静力试验.试验结果表明构件滞回曲线稳定饱满,具有较好的耗能能力,相对于钢材而言铝合金材料的应变强化现象十分明显.基于Chaboche循环塑性本构模型,通过试验数据标定了相关材料参数并应用于构件有限元分析,分析结果与试验结果吻合较好.利用Abaqus软件平台二次开发了能够应用于梁单元进行减震结构弹塑性分析的单轴双面模型,通过与Chaboche模型的对比分析,验证了单轴双面模型的准确性.研究结果可为准确分析铝合金构件在地震作用下的受力性能提供相应依据.

The innovative buckling-restrained braces（BRBs）were fabricated with Chinese aluminium alloy,and a series of quasi-static tests were conducted to address the energy dissipation behavior of the aluminum alloy BRBs（ALBRBs）.The experimental results show that the strain hardening of the aluminium alloy was more obvious than structural steel and the hysteretic curves were very full and stable,showing that the energy dissipation capacity was good.Based on the Chaboche plastic constitutive model,the material parameters of aluminium alloy constitutive model were obtained from experimental data calibrated which can be used for finite element analysis.The results of analysis were exactly similar to the results of the experiment,and could accurately calculate the response of structures in earthquakes.By using the Abaqus software platform,a user-defined material program,the uniaxial two-surface model program（UTSMP）,was developed for analyzing the elastic-plastic process of passive energy dissipation structures by using beam elements.The UTSMP was verified by comparing the analysis results with the Chaboche model.The results may provide corresponding basis for aluminum alloy components seismic behavior analysis.