套筒灌浆钢筋高温抗拉性能数值模拟

Numerical Simulation of High Temperature Tensile Properties of Sleeve Grouting Steel Bar

为研究装配式建筑结构中钢筋套筒灌浆连接节点在火灾条件下的抗拉性能,采用有限元分析软件ANSYS计算出在ISO-834标准升温曲线作用下的钢筋套筒灌浆节点不同时刻的温度场分布。在此温度分布下对套筒内钢筋的端部施加一系列的拉力载荷,利用ANSYS进行温度场-结构耦合分析,计算出钢筋套筒灌浆节点不同拉力载荷作用下的耐火时间,以确定耐火时间-荷载关系曲线。ANSYS模拟出的常温下钢筋套筒灌浆连接节点的极限承载力与实际情况相吻合,破坏时套筒内钢筋端部屈服,极限承载力接近钢筋的屈服极限。

In this paper the tensile property of the steel sleeve grouting connection joints in the assembly building structure was analyzed. The temperature distribution of grouting joints of steel bars were calculated by finite element analysis software ANSYS at different time under ISO- 834 standard. End of steel bar applied to a series of tensile load carry on structural coupling analysis of temperature field by ANSYS. the fire resistant time about steel sleeve grouting joint under different tensile load determine the relation curve of refractory time load was calculated. The ultimate bearing capacity of the steel sleeve grouting connection joints in the normal temperature is consistent with the actual situation. Failure occurs at the end of the sleeve when the steel bars yield. The ultimate bearing capacity is close to the yield limit of the steel bar.