多自由度结构受冲击时的动力响应

Dynamic response of multi-freedom structure under shock loads

根据有限单元法的基本原理,将工程结构离散化,成为多自由度结构,采用子空间迭代法分析其自振特性,用Wilson-θ法可以计算其动力响应.文中以龙潭河大桥为例,计算了该桥拱顶受横向冲击时的动力响应,并与该桥受横向地震作用时的计算结果进行了比较,两者的变化规律不一致.

Based on the FEM method basic principles, an engineering structure can discret a multi-freedom structure system model. The characteristics of free-vibration of the model can be solved by sub-space iteration method and its dynamic response can be calculated by Wilson- θ method. Longtanhe River Bridge, as an example in this paper, its dynamic response of transverse shock on arch rib top is calculated and compared with the results of transverse seismic response, the changing law of them is unlike.