二次预应力组合结构试验研究

为了解决预应力混凝土结构中反拱过大的问题，提出了二次预应力组合结构的新概念；基于线性徐变理论和变形协调原理，推导了二次预应力组合结构的内力重分布计算公式；在此基础上，进行了二次预应力组合结构和常规预应力梁的对比试验，并进行了大量的数值计算和分析，得到了结构内力重分布结果和变形结果。试验结果和理论分析均表明：二次预应力组合结构可大大改善反拱过大等问题，值得进一步推广。

Test Study of Double Prestressed Composite Structure

The conception of double prestressed composite structure was provided in order to solve the great inverted camber problems in prestressed concrete structure; based on the linear creep theory and deformation compatibility principle, the computing formulas about the redistribution of internal force of double prestressed composite structure were brought forward. Comparison test of common prestressed beam and double prestressed composite beam and numerical computation and analysis were provided; based on these facts, the redistribution results of internal force and deformations were gotten. Experiment results and theoretical analysis indicate that double prestressed composite structure can solve the great inverted camber problems, so it is worth popularizing.