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在结构物应力分析中,梁或杆的静力分析已很完善,受到冲击、爆破或地震等动载作用的情况也有较多研究,从现有资料看,这两类研究都只单独考虑静载或纯动载作用。实际工程中,许多结构物都是在承受自重等形成的较高静应力基础上,再承受诸如地震、爆破、冲击等的瞬态应力作用,这种情况在地下工程结构物,地下岩体开采中更为明显。静载与瞬变载荷同时作用下,结构物的应力分析是一个动态过程,而且涉及到介质动态响应特性、材料参数(E、v、fσ等)、及应力波在初应力介质中的传播特性等一系列较为复杂的问题,本文采用动态光弹性技术,成功地完成了静载与动载(冲击、爆破)的同时施加,讨论了梁杆等构件在混合载荷作用下的应力分布情况、应力波在初应力介质中的传播特性。
In the structural stress analysis, the static analysis of beams or rods has been perfected, and there are also many studies on the dynamic load impacts such as impact, blasting, or earthquake. From the available data, these two types of studies have only considered static alone. Load or pure dynamic load. In practical projects, many structures are subjected to transient stresses such as earthquakes, blasting, and impact on the basis of the higher static stresses formed by their own weight. This is the case in underground engineering structures where underground rock masses are mined. The more obvious. Under the simultaneous action of static load and transient load, the stress analysis of the structure is a dynamic process, and involves the dynamic response characteristics of the medium, the material parameters (E, v, fσ, etc.), and the propagation characteristics of the stress wave in the initial stress medium. For a series of more complicated problems, this paper adopts the dynamic photoelastic technology to successfully complete the simultaneous application of static load and dynamic load (impact and blasting), and discusses the stress distribution and stress of the beam and other components under the action of mixed loads. Wave Propagation in Initial Stress Media.