Investigation into Computational Method of Self-Equilibrating Thermal Stresses in Concrete Bridges
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摘要: 为了更准确地计算混凝土桥梁结构的温度应力,提出了一种基于弹性理论求解温度自应力的新方法.该方法按平面应变问题求解横向温度应力,在此基础上用解析公式计算纵向温度应力.为了验证了该方法的正确性,给出了一个算例.算例表明,该方法与三维有限元法的计算结果基本相同,而基于结构力学的传统方法,计算误差最大可达30%以上.Abstract: An analysis was conducted to more accurately evaluate thermal stresses in structural members of concrete bridges.Based on theory of elasticity,a new method of evaluating self-equilibrating thermal stresses in concrete bridges was proposed.With this method,the transversal stresses are solved as a plane strain problem,and consequently the longitudinal stresses are calculated with an analytic formula.Finally,an example was given to verify the validity of the method.The example shows that calculated thermal stresses using the proposed method are almost the same as ones obtained by a 3D FEM(finite element method),while the conventional method based on structural mechanics can result an error over 30%.
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Key words:
- concrete bridge /
- self-equilibrating thermal stress /
- theory of elasticity
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