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基于目前流行的气囊技术,设计了一种适用于梁构件的气囊均布加载拟静力试验装置。基于ABAQUS软件平台fluid cavity功能,建立了该实验装置的精细化有限元分析模型;计算分析了气囊的均布加载效果和传力特性,并将分析结果与传统四点弯加载和理想均布加载进行比较,验证了气囊均布加载的可行性。通过数值模型试验讨论了影响气囊加载试验方法的关键影响因素。结果表明,针对钢筋混凝土梁等非弹性构件进行全过程加载试验,传统四点弯加载方法误差较大,量测结果也不能通过简单的挠度修正系数进行修正。气囊加载技术能够较好地模拟构件全过程均布加载,但应通过数值试验确定适宜的气囊材料参数和约束边界。
Based on the current popular balloon technology, a uniform static loading device for the airbag of beam components is designed. Based on the fluid cavity function of ABAQUS software platform, the finite element analysis model of the experimental device was established. The uniform loading effect and force transfer characteristic of the airbag were calculated and analyzed. The results were compared with the traditional four-point bending and ideal uniform loading Compared to verify the feasibility of uniform airbag loading. The key influencing factors of airbag loading test method are discussed through numerical model test. The results show that the traditional four-point bending method has a large error and the measurement results can not be corrected by a simple deflection correction coefficient for the whole-process loading test of inelastic members such as reinforced concrete beams. The airbag loading technology can simulate the whole process of component loading evenly, but the appropriate airbag material parameters and constraint boundaries should be determined through numerical experiments.