模型外载与自重并存变动外载的光弹性分析法

Varying External Loads Method on a Model in Photoelasticity Stress Analysis Under Its Own Weight Combination with External Loads

提出一个变动模型外载 ,分析大模型在外载与自重共同作用时的尤弹性法。它与用离心力模拟自重试验的传统方法完全不同 ,只要在大模型上变动外载 ,就可以获得上述两种载荷共同作用下应力分析结果 .此法避免了用离心力模拟自重受模型尺寸限制等诸多因素影响的缺点 ,为自重不可忽略的大型复杂空间工程结构模型试验应力分析提出了一条新的途径。

A new photoelastic method for stress analysis for large structure model under it s own weight and external loads is proposed. The new technique, based on varying external loads, is different from the method of gravitational loading to simula te the structure weight. By means of varying extemal loads, the total stress can be obrained as a sum of the stresses due to weight and external loading. It ove rcomes the restriction of gravitational loading experiment on the model size. I t is a new approach for stress analysis of the largescaled and complex engineeri ng structural model, which weight cannot be ignored. In this paper, the principl e and its verification of the new method, as well as the results of its enginee ring application, are presented.