考虑钢筋混凝土框架整体二阶效应规律的改进η-l_0法

The Improved η-l_0 Method Considering the Whole Second Effect Laws of RC Frame

概括了各国设计规范用于钢筋混凝土框架柱二阶弯矩计算的 η- l0 法的发展过程和特色 ,说明了我国《混凝土结构设计规范》(GBJ10 - 89)采用的 η- l0 法的优势和不足。在重点指出框架结构二阶效应基本规律的同时 ,给出了能更准确反映框架结构整体二阶效应特征的使用 η极限曲率表达式的改进 η- l0 法 ,可供修订我国《混凝土结构设计规范》参考。

This paper summarized the development and feature about the η l 0 calculation method for second order moment of RC frame column in standards of various countries, and illustrated the advantage and disadvantage about η-l 0 method in China National Standard 'Code for Design of Concrete Structure'(GBJ10-89). As the indication of basic laws for the second order effect, the improved η l 0 method adoptingη ultimate curvature formula is developed. This method showed more accurately the second order effect of the whole frame structure character, it can be used as a reference in the revision of China National Standard.