论文部分内容阅读
为了研究型钢再生混凝土(SRRAC)柱火灾后的轴压力学性能,利用ABAQUS有限元分析软件建立了ISO-834标准火灾作用后型钢再生混凝土轴压短柱的有限元分析模型,对截面温度场及剩余承载力进行分析,并与已有相关试验数据进行对比验证。分析了受火时间、再生粗骨料取代率、混凝土强度、型钢屈服强度、截面含钢率等参数对剩余承载力的影响。结果表明:型钢再生混凝土轴压短柱经历火灾作用后承载力显著降低,但再生粗骨料取代率大于50%的型钢再生混凝土轴压构件,在受火时间超过60min时,剩余承载力下降幅度不大甚至略有提高;随着再生混凝土强度的增大,剩余承载力影响系数逐渐降低,再生粗骨料取代率为30%时剩余承载力系数略低,型钢屈服强度和截面含钢率对剩余承载力系数的影响并不明显。
In order to study the axial compressive properties of post-fire SRRC columns, a finite element analysis model of the axial compression stub columns of SRC columns after the ISO-834 standard fire was established by using ABAQUS finite element analysis software. Residual capacity analysis, and with the existing test data for comparison and verification. The influence of the time of fire exposure, the replacement rate of recycled coarse aggregate, the strength of concrete, the yield strength of section steel and the steel content in section on the remaining bearing capacity were analyzed. The results show that the bearing capacity of SRC columns after the fire is significantly reduced. However, when the recycled aggregate concrete axial compressive members with replacement ratio of recycled coarse aggregate exceed 50%, the residual capacity decreases With the increase of strength of recycled concrete, the influence coefficient of residual bearing capacity gradually decreases, the coefficient of residual bearing capacity is slightly lower when the replacement ratio of recycled coarse aggregate is 30%, the yield strength of steel and the steel content in section The effect of residual bearing capacity coefficient is not obvious.