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利用ANSYS有限元对梁柱三面受火无侧移单层单跨箱形钢柱组合框架受火后的性能进行数值模拟分析,得出了组合梁和钢柱温度场变化规律及框架受火后的变形和内力情况。分析表明:梁、柱沿截面高度、宽度方向均存在变化的温度场,温度梯度随受火时间的增加先逐渐增大后逐渐减小,且升温速度越快其最大值出现越早;三面受火的单层单跨箱形钢柱组合框架典型破坏模式为钢柱平面内对称屈曲破坏,破坏位置位于节点下部1.0~1.2倍钢梁高处;约束轴力是影响组合梁弯矩变化的关键因素。
By using ANSYS finite element method, the numerical simulation of the behavior of single-span and single-span box-girder composite frame subjected to fire with no lateral movement on three sides of beams and columns was carried out. The variation law of the temperature field of composite beams and steel columns and the deformation And internal conditions. The analysis shows that there are some temperature fields along the height and width of the beam and column. The temperature gradient increases first and then decreases with the increase of fire time, and the higher the temperature rise, the earlier the maximum appears. The typical failure mode of fire single-span box-column composite frame is symmetric buckling failure in the plane of steel column, the damage location is located at the height of 1.0 ~ 1.2 times of the steel beam in the lower part of the node. The restrained axial force is the key factor that affects the bending moment change of the composite beam factor.