体外预应力加固雁形板的承载力分析

Bearing Capacity of the External-Prestressed Bird-Shape Plates

通过两根 18m跨雁形板在用体外预应力筋加固前后的静载及破坏实验 ,分析研究了体外预应力加固雁形板后的承载力变化 ,并按比拟梁法对加固构件的承载力进行了计算。计算结果与试验结果表明 ,张拉体外预应力钢筋加固雁形板后 ,承载力有一定程度的提高 ,但由于雁形板的提前失稳破坏使极限承载力提高程度不大 ,而且 。

By means of static loading and destruction test on two 18 m span bird-shape plates before and after strengthening, the change of the bird-shape's bearing capacity is analyzed which is strengthened by external tendon. It is indicated by comparing the theoretic results with those of tests that the bird-shape's bearing capacity is raised to some extent after strengthening, the plate's stability confined the increment of bearing capacity, and reinforcement by the curved line-shape tendon is superior to that by the straight line-shape tendon.