钢与高强混凝土预应力组合梁数值分析

Numerical analysis of prestressed steel composite beams with high-strength concrete

为在理论上对预应力组合梁力学性能有更进一步认识,以数值积分方法为基础,考虑材料非线性,提出钢与高强混凝土预应力组合梁由加载至破坏的全过程非线性分析模式,研制计算程序,对其进行全过程非线性分析,得到载荷与变形、载荷与预应力增量关系曲线。结果表明:组合梁的受力状态一般经历弹性、弹塑性及塑性三个阶段,并且在整个加载过程中,组合梁的刚度发生过变化,在局部区域出现塑性铰。通过预应力筋与钢梁的变形协调求出预应力筋的内力增量,计算结果与试验结果吻合良好。该成果为预应力组合梁设计提供理论分析手段。

In order to know the strength performance of composite beams further, on the basis of integration for finite element, nonlinear full-range analytical mode on the prestressed steel composite beams with high-strength concrete is presented. The program for calculating is worked out and the cure lines of the load deformation and load-prestress increment are obtained. The result indicates that the stressful condition of composite beams goes through elasticity, plasticity and elasticity-plastic stages. The rigidity of composite beam has changed in the entire process. Prestress increment is gotten using deformation coordination of steel beam and prestressed steel wire. The calculating results tally well with the experimental results. The paper offers the theory for nonlinear design methods.