阶形柱的极限承载力

本文采用数值分析方法首次计算了实腹式工字形截面阶形柱极限承载力和荷载-挠度全曲线。理论分析可计入各种初始缺陷的影响,并可考虑加载次序及截面纤维加、卸载效应的影响。经与试验结果比较,证明本文理论方法具有较高的精度。本文在大量参数运算的基础上,分析了规范实用计算方法的误差及其原因,提出了验算阶形柱上、下柱的建议方法,经计算比较,结果令人满意。

Ultimate Strength of Steel Stepped Column

A new and general method and a comprehensive computer program are developed for predicting the ultimate strength and the load-deflection curves of steel stepped columns with H sections. The influence of all initial imperfections and the effects of loading, unloading and reloading of yielded fibers are taken intoaccount. Experiments have been conducted to verify the theory. The experimentalresults have proved that the accuracy of the proposed method is quite satisfac-tory. On the basis of extensive parametric studies, errors of some prevailing spe-cifications about the ultimate strength of stepped columns are investigated andcauses of these errors are examined item by item. Finally, simplified methods forcalculating the stability of stepped columns are presented whose results show agood agreement with those of the theoretical method.