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既有建筑、桥梁等混凝土结构的安全性能评估中,混凝土构件的受力状态是一个主要评价因素,通过对理想状态模型的数值分析不能精确计算出构件实际内力值。本文介绍了采用应力释放技术测试和识别构件内力的基本原理,并详细推导了各内力分量作用下截面的正应变和剪应变。证明了只要通过测试截面三个边中点处的应变就可以识别出钢筋混凝土构件截面内力。
In the assessment of the safety performance of the existing buildings, bridges and other concrete structures, the stress state of the concrete members is a major factor for evaluation. The numerical analysis of the ideal state model can not accurately calculate the actual internal force values of the members. This paper introduces the basic principle of using stress relief technology to test and identify the internal forces of members, and deduces the normal strain and shear strain of the cross-section under various internal force components in detail. It is proved that the cross-section internal forces of reinforced concrete members can be identified as long as the strain at the mid-point of the three sides of the test cross-section is tested.