部分预应力混凝土公路简支T梁可靠度优化设计研究

Reliability-optimization Design of PartiallY Prestressed Concrete Simply-supported T-beam inHighway Bridge

将结构可靠性理论与优化设计方法结合起来，对部分预应力混凝土公路简支Ｔ梁的可靠度优化设计进行研究，在建立了可靠度优化设计数学模型后，编制了功能齐全的综合程序（ＰＰ－ＣＯＰＴ），将广义拉格朗日乘子法与无约束非线性优化中的改进Ｐｏｗｅｌｌ直接搜索法结合起来进行约束非线性优化问题的计算，给出了算例，并分析比较计算结果。

Reliability-optimization design of partially prestressed concrete simply-sup-ported T-beam in highway bridge is studied in the paper by incorporating the structural reliability theory and optimum design method.First,the reliability-optimization model is estab-lished,and then the comprehensive program is worked out,in which the constrained nonlinear optimization is performd by augmented Lagrange Method coupled with Powell’s direct search method of unconstrained nonlinear optimization techniques ,finally ,an example is given and the calculated results are analysed.