钢管混凝土拱桥肋拱面内极限承载力全过程计算机模拟

COMPUTER SIMULATION OF THE WHOLE PROCESS FOR ULTIMATE LOAD OF STABILITY IN THE PLANE OF RIBBED ARCHES OF CONCRETE-FILLED STEEL TUBULAR ARCH BRIDGE

采用钢管混凝土统一理论和多线性随动强化模型 ,并引入等效紧箍力 ,研究钢管混凝土肋拱面内极限承载力 ,给出了模拟钢管混凝土肋拱面内受力全过程的物理模型、力学模型、数学模型。通过模拟全过程的位移变化和极限承载力 ,对各个阶段的定性和定量分析 ,并与两个模型试验的比较 ,说明了该模型的适用性和正确性 ,模拟结果表明与试验结果吻合良好 ,并探讨了弹性极限值、屈服极限与极限承载力的比例关系。

In this paper, the unified theory, multilinear kinematic hardening model and equivalent confined stress are used to study the ultimate load of stability in the plane of CFSTAB ribbed arches. The physical model, mechanical model and mathematic model developed to simulate the whole loading process of CFSTAB ribbed arches are presented.The displacement variation of the whole process and the ultimate load of stability are simulated for the qualitative and quantitative analysis at each stage.The solutions of simulation are compared with two experimental results.The agreement between the two solutions of the simulation and experiment is satisfactory, which illustrates that the models are applicable and correct.The proportional relations of elastic limit, yield limit and ultimate load of stability are also discussed in the paper.