落石冲击作用下钢筋混凝土棚洞结构的动力系数研究

Study on the Dynamic Coefficient of Rock Shed Under Rock-fall Impact

以钢筋混凝土棚洞为原型,通过ANSYS/LS-DYNA有限元分析软件,考虑在不同能量的落石冲击不同位置的情况下,分析了钢筋混凝土棚洞的动静力响应及其冲击动力系数,得到了弹塑性状态下棚洞冲击动力系数的变化规律。据此,棚洞结构的动力冲击设计可转化为落石的静力荷载作用下的设计,即通过钢筋混凝土棚洞结构在落石静力荷载作用下的最大响应乘以考虑了能量因素的冲击动力系数可以确定落石冲击作用下钢筋混凝土棚洞结构最大动力响应。

By using finite element software ANSYS/LS-DYNA, the dynamic response, dynamic impact coefficient and its trend during elastic-plastic state are analyzed. The dynamic impact design of rock shed can be transformed into rock-fall static design. The maximum dynamic response can be determined by the maximum static response of rock shed multiplied by the dynamic impact coefficient which considers energy factor.