U型渡槽环向无粘结预应力钢绞线束优化设置  

Optimization design of prestressing tendon without bond in U-shape aqueduct bridge

作　　者：陆晓敏[1] 赵引[1] 任青文[1] 李鹏[1] 

机构地区：[1]河海大学工程力学系,江苏南京210098

出　　处：《水利水运工程学报》2009年第2期55-60,共6页Hydro-Science and Engineering

摘　　要：构建了计算任意形状无粘结预应力钢绞线束由摩擦引起的内力沿程损失数值模型,并用于某渡槽环向钢绞线束的优化设置.通过作者编制的程序计算表明,随着钢绞线束分割单元数的增加,其内力计算结果趋于理论解,并有足够的精度;进而以槽壁若干截面的弯曲应力之和作为目标函数,以钢绞线在各截面内的位置为设计变量,应力作为约束条件,建立了预应力环向钢绞线束合理位置的优化模型,并利用复形法进行了求解.结果表明,本文的优化模型可以显著减小槽壁内的弯曲应力,使槽壁轴向趋于均匀受压.A numerical method to calculate internal force loss of pre-stressing tendon without bond duo to friction is established, and is used to design an aqueduct bridge. Its computational program written by the authors gives the results that the internal force is close to theoretical solution when the number of tendon elements increases. The numerical solution has enough precision. A optimization design mode of pre-stressing tendon without bond in the wall is presented, and is solved by Complex Method. Its destination function is defined by sum of absolute difference between internal and external circumferential stresses in the 5 sections of wall. The tendon coordinates in wall sections are chosen as the design variables. Allowable stresses are set as constrained conditions. The mode can make stress distribute uniformly in wall. The result shows that the method presented in the paper is feasible.

关 键 词：渡槽 预应力钢绞线束 优化设计 

分 类 号：TV672.3[水利工程—水利水电工程]