钢板−CRRPC−TPO复合梁弯拉受力非线性分析

摘要

To solve major problems for long-span steel bridge such as fatigue cracking and damage on pavement, a STEEL?CRRPC?TPO composite deck paving system was presented. Based on the nonlinear stress?strain relations of steel, CRRPC and TPO, a whole process of bending simulation was made, and the cracking point, yield point of the steel and the failure point were obtained for the composite beam of the new paving system. The results show that the theoretical analysis can reflect the loading features and the deformation performances of the STEEL?CRRPC?TPO composite deck paving system. The errors of load at feature points are 3.2%?3.9%, and the errors of deflections are 5.7%?8.7%.The cracking load and failure load of the simulations are lower than those of the experiments, which means that the engineering design using the simulation process has higher security.%为解决大跨径钢桥面铺装面临的疲劳开裂和铺装易损等难题,提出钢桥面CRRPC?TPO超高性能轻型组合桥面铺装体系.考虑TPO,RPC及钢材的非线性本构关系,对新结构复合梁进行弯拉非线性仿真模拟,得到复合梁的初裂点、钢材屈服点以及复合梁破坏点的荷载和结构变形.研究结果表明:荷载?挠度曲线理论计算能够较好地反映钢板?CRRPC?TPO新型组合结构体系的受力特点及变形性能,特征点荷载误差为3.2%~3.9%,挠度误差为5.7%~8.7%;复合梁数值计算的初裂荷载及极限荷载均比试验结果略小,运用本文编制的数值计算程序进行工程设计偏于安全.