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本文根据地下防护结构在平面压缩波作用下的受力特点,在考虑行波荷载影响的基础上,提出考虑结构—介质相互作用的动力分析方法。主要是采用粘—弹性体模型来描述介质对结构的作用;用一维波理论近似处理结构变形速度对动荷载特性的影响。同时,将结构视为有限自由度体系(由N根杆件组成的绞结机动链),利用虚位移原理建立t时刻的运动微分方程。引进线性加速度假设,以逐步积分法进行求解。文中还给出算例,程序设计框图。最后,对有关问题进行了初步讨论。
In this paper, based on the force characteristics of the underground protective structure under the action of plane compressional waves, a dynamic analysis method considering structure-medium interaction is proposed on the basis of considering the influence of traveling wave loads. The visco-elastomer model is mainly used to describe the effect of the medium on the structure; the influence of the structural deformation velocity on the dynamic load characteristics is approximated by the one-dimensional wave theory. At the same time, the structure is regarded as a finite degree of freedom system (knocking maneuvering chain composed of N rods), and the differential equation of motion at t is established by using the principle of virtual displacement. The linear acceleration hypothesis was introduced and solved by the step-by-step integration method. The text also gives an example, program design block diagram. Finally, a preliminary discussion of relevant issues was conducted.