L形带肋钢管再生混凝土轴压短柱力学性能有限元分析

Finite element analysis on mechanical performance of recycled aggregate concrete filled stiffened L-shaped steel tubular stub columns under axial compression

为研究L形带肋钢管再生混凝土短柱的轴压力学性能,在验证模型有效性的基础上,使用有限元软件对带肋钢管再生混凝土短柱与无肋钢管再生混凝土短柱轴压下的受力过程、破坏模式进行对比分析。研究了再生混凝土取代率、柱长径比、钢材强度、钢板厚度等参数对L形带肋钢管再生混凝土力学性能的影响。结果表明:再生混凝土取代率和柱长径比对短柱影响显著,随着取代率、长径比的增加,构件的承载力降低,变形能力增大;随着钢材强度提高,短柱的承载力增大;钢板厚度的增加,有利于承载力及变形能力的提高。

In order to investigate the mechanical performance of recycled aggregate concrete filled stiffened L-shaped steel tubular stub columns under axial compression,the loading process and failure modes were conducted analysis between unribbed and ribbed short columns under axial compression by finite element software,the accuracy of which is verified with related test results. The effects of recycled coarse aggregate replacement rate,length-diameter ration,steel strength,steel thickness on the mechanical response of recycled aggregate concrete filled stiffened L-shaped steel tubular were studied. The results indicate that the recycled coarse aggregate replacement rate and length-diameter ration are significant factors in the mechanical behavior. Increasing the replacement rate or length-diameter ration,the bearing capacity was decreased,but deformation ability was improved; The ultimate bearing capacity was improved with the increase of steel strength; Increment in steel thickness has positive effects on bearing capacity and deformation ability.