钢框架极限承载力的有限变形理论分析和试验研究

GEOMETRICAL AND MATERIAL NONLINEAR ANALYSIS OF THE ULTIMATE STREGTH OF STEEL FRMAES

本文为钢框架极限承载力的全过程分析提供了一种有效的方法。该法基于非线性连续介质力学理论,导出了结构的几何刚度矩阵,它不仅包含了轴力对结构刚度的影响,而且还包含了剪力和弯矩的影响。根据内力屈服面塑性流动理论,把经典的塑性铰概念加以推广,既考虑了塑铰性处内力之间的相互影响,也考虑了弹性卸载的影响。进行了四榀钢框架极限承载力的试验,试验与理论分析结果符合良好。

Experimental research and nonlinear theoretical analysis of the ultimate strength of steel frames are presented in this paper. 4 steel frames in which 2 are two-story onebay frame and other 2 are two-story two-bay frame were tested. A suitable nonlinear analysis method, which is based on nonlinear continuum mechanics, stress-resultant yield surface and displacement increment Newton-Raphson subincrementation scheme, is successfully applied to the large deformation elasto-plastic analysis of the ultimate strength of steel frames. The comparison of the theoretical predictions with the experimental results tested by the author verifies that the theoretical method derived in this paper has very high precision and efficiency.