【摘要】 将预应力钢梁看作梁与索的组合结构,充分考虑了梁与索之间的相互作用。基于梁与索的现实构形,分别推导了梁与索的几何非线性有限元方程。该方法简单,直观。采用有限元方程进行理论计算所获得的数据,如钢梁的跨中和1/4跨的挠度,底板应变和钢索的张力增量等均与预应力钢梁模型的试验结果符合良好,这表明了所推导的方程的有效性和正确性。更多还原

【Abstract】 A prestressed steel girder is regarded as composite structure of girder and tendons, and the interactions between them are fully considered. The geometrical nonlinear finite element formulations for both girder and tendon are proposed based on the present girder element. The formulations are simple and straightforward. The experimental results of deflections at the mid-span and quarter span, bottom plate strain of the steel girder, and the tension increment of tendons are in good agreement with the theoretical calculations. This confirms the validity of the present formulation.更多还原