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对变截面预应力梁进行有限元分析时,其预应力荷载最终要转化到单元节点上,因此有关变截面梁预应力效应的计算是解决此类问题的关键,根据有限元理论,引入变截面梁单元的形函数,推导了计算具有任意预应力筋曲线形状及沿预应力筋纵向具有任意分布的预应力所产生的变截面梁端等效荷载的积分表达式。从而为预应力混凝土变截面梁的计算提供了一种新的求解思路。
When the finite element analysis of prestressed beams with variable cross section is carried out, the prestressing load will eventually be transformed to the unit nodes. Therefore, the calculation of the prestressing effect of the beam with variable cross section is the key to solve these problems. According to the finite element theory, Beam element, the integral expression of the equivalent load of beam with variable cross section produced by calculating the shape of prestressed tendons and the prestress with arbitrary distribution in the longitudinal direction of prestressed tendons is derived. This provides a new idea for the calculation of prestressed concrete beams with variable section.