钢管拱面内非对称加载试验

进行了钢管拱面内非对称加载全过程试验.试验结果表明，钢管模型拱截面抗弯刚度小，受力过程弯曲变形较大.模型拱截面在受力全过程以弯矩作用为主，轴力较小，轴力与挠度交互作用的几何非线性影响较小.结构破坏属于以材料非线性影响为主的二类稳定问题.结构破坏时，塑性区域的分布较广，应力重分布现象明显，其极限承载力不能采用极限状态法.图6，表1，参6.

Test of steel tubularmodel arch under non-symmetric in-plane loads

The model experiment of a steel tubular arch under in-plane non-symmetric loads is reported. It shows that the displacements of the model developed rapidly for its small rigidity. Moments was the main forces in the model during the whole loading procedure and the geometric influence was distinctly. The collapse model of the steel tubular arch is of the second stability problem ,in which the material nonlinear influence is obvious. When the structure reached the ultimate loads, the plasticity was distributed in large zone. The redistribution of the stress is sharply, the ultimate strength can not be calculated by the ultimate state method.6figs,1tab.,6refs.