预弯组合梁非线性全过程分析方法

Nonlinear Whole-Course Analysis Method of Preflex Composite Beam

采用材料非线性本构关系研究预弯组合梁的受力行为,建立预弯组合梁从预弯钢梁加荷到结构破坏的非线性全过程分析方法。利用该方法可以对结构的各受力阶段进行模拟计算,得出各阶段预弯钢梁、一期混凝土、二期混凝土的应力和结构变形,并能计算出预弯组合梁的开裂荷载和极限破坏荷载。该方法突破了日本学者提出的以弹性分析法为基础的预弯梁计算理论。利用该方法已完成了十余座预弯组合梁桥的设计分析,取得了良好的计算结果。

Nonlinear analysis method on the mechanical behavior of preflex composite beams was established with the nonlinear stress-strain curves of materials. With the method, each mechanical stage of this kind of structure could be simulated and calculated including crack moment, ultimate strength, stresses and deflections of all stages more precisely. Elastic analysis method of preflex composite beam proposed by Japanese was broken through. More than ten preflex composite beam bridges were designed and analyzed with this method, and excellent results were obtained.