预应力拉索结构静力性能分析

Analysis of static performances on prestressed cable structure

结合在幕墙中的应用,系统研究了预应力拉索结构的静力性能。推导出预应力拉索索力解析表达式,提出了基于拉索初始预应力及名义拉力为变量的求解公式,建立起具有概念明确、表达简洁的预应力拉索解析表达方法,并对求解公式进行简化;根据预应力拉索在玻璃幕墙中的受荷情况,推导出常见荷载作用下的索力求解公式;求解出线性荷载作用下的拉索最大位移位置及最大位移与跨中位移的比值限值,便于工程应用;最后,通过算例对理论推导结果与有限元分析结果进行比较,验证理论分析结果的正确性。

Static performances of prestressed cable structure are studied systematically, combined with its application in curtain wall. Analytic solutions of prestressed cable structure’s force are derived, solution formulas are proposed based on initial prestress and cable norminal tension force induced by load only, furthermore, analytic expression method with clear concept and simple expression is established. Solution formulas of forces under common loads are derived combined with its application of prestressed cable in glass curtain wall, and then simplified solution formulas and ranges of application are given.The maximum displacement position and the ratio limitation between the maximum displacement and the displacement of middle span under linear load are derived, which is convenient for engineering application. Finally, results of analytic solution and finite element analysis are compared by examples to verify the correctness of the theoretical analysis results.