预应力混凝土曲线梁内力分析

基于能量法导出的空间薄壁曲线梁单元刚度矩阵和力法推导的空间等效结点荷载,对预应力曲线梁根据力学原理和微分几何基本公式推导了曲线梁预应力等效荷载的完整公式。在分析中考虑了曲线梁的翘曲作用和截面形心与剪心不重合对内力的影响,在预应力等代荷载的推导时直接计入了摩阻力的影响。在此基础上编制了计算程序并通过实例验证了程序的正确,并得出了曲线梁在水平荷载的作用下相当于拱的作用的结论。

STRESS ANALYSIS OF P.C CURVED THIN-WALLED GRIDERS

Based on the energy theory and curved grillage theory,the three dimensional curved thin-walled member stiffness matrix and the equivalent space nodal forces is presented,and the equivalent spatial loads in which the firction is directly considered for an arbitrarily acting prestressing tendon force are developed by mechanics theory.In the analysis,the effect of warp and the eccentricity between centroid and shear centre of section are taken into account. A computing program is developed and two example demonstrates the accuracy of the method.