不同温度下约束钢梁的落锤冲击响应分析

研究不同温度和冲击荷载作用下约束钢梁的动力响应问题。利用通用非线性有限元分析程序ANSYS/LS-DYNA,分别模拟了两端固支、一端固支一端轴向弹簧约束的钢梁在不同温度下受到落锤冲击时的动力响应。在温度荷载和冲击荷载联合作用下,分析了位移响应、撞击力时程曲线及冲量等的温度效应。通过撞击力时程曲线分析得出最大撞击力随温度的变化趋势与欧洲规范EC3给出的不同温度下的钢材的屈服强度折减系数的变化趋势相似,钢梁跨中的横向位移随着温度的升高而增加。还分析了高温和冲击荷载联合作用下落锤的撞击速度、不同的质量—速度组合、横向加劲肋对钢梁的变形的影响。

Impact Response of Restrained Steel Beams at Different Temperatures

This paper mainly studies the dynamic impact response of restrained steel beams at different temperatures. Using the general nonlinear finite element analysis program ANSYS/LS-DYNA, the response behavior of steel beams with different end restrained conditions, including fixed-fixed and fixed-axial spring combinations, at different temperatures is simulated respectively. Under the combined action of temperature and impact, the temperature effects on displacement response, impact force-time history and impulse are analyzed. According to the analysis of the impact force-time history curve, the variation trend of the maximum contact force with temperature is similar to the variation trend of the yield strength reduction coefficient of steel with temperature given by EC3. The mid-span transversal deflection increases with the rise of temperature. Furthermore, the effects of impact velocity, mass-velocity combination and transverse stiffener on the deformation of the beam under the combination action of temperature and impact load are also presented.