预应力高强混凝土T梁非线性结构行为研究

Nonlinear Structural Behavior of PreStressed High-Strength Concrete T-Beam

结合高强混凝土的特点,考虑材料非线性影响,计算了预应力高强混凝土T梁的极限承载力。在非线性有限元分析中,提出了合适的预应力钢筋建模方法。选择了适合于预应力高强混凝土梁非线性分析的一些基本理论,主要包括混凝土和钢筋的应力应变关系、整体式有限元模型、混凝土的破坏准则。计算结果表明:这些方法对预应力高强混凝土梁的非线性分析具有良好的适应性。基于上述理论,对影响预应力高强混凝土承载力的主要参数进行了对比分析,其结果可供工程设计参考使用。

In this paper, the ultimate carrying load capacity of pre - stressed high - strength concrete T - beam is computed with material nonlinear properties. In this study, some theories are proposed for the nonlinear finite element analysis for the pre-stressed high-strength concrete beam, including the relation of the stress and strain for the concrete and the steel, the integral FEM model, the failure criterion of the concrete. The results show that the recommendatory method of the paper can well describe the nonlinear analysis of the pre - stress concrete beam. Based on the above theory, the influence of main parameters of the pre - stressed high - strength concrete beam upon the ultimate carrying load capacity is analyzed . The result can provide reference to design and calculation.