(重庆大学土木工程系，重庆 400045)

［摘要］《混凝土结构设计规范》(GB50010—2002)第7.3.11条给出的用于计算有侧移钢筋混凝土框架柱偏心距增大系数η的柱计算长度l0表达式，是对根据弹性稳定理论确定有侧移框架柱计算长度的分离杆件法理论解的近似拟合公式，它适用于常规梁、柱尺寸的多层框架。在高层建筑框架部分的若干常见情况下，该式将给出误差过大的计算结果。为此，对分离杆件法理论解和规范式之间的误差变化规律做了系统分析，提出了两种与理论解符合程度有明显改善的修正拟合公式，供工程设计及今后修订规范参考。

［关键词］框架柱； P-Δ效应；柱计算长度

Opinions for modifying fitting formula of effective length based on member isolation method of sway columnLiu Yi, Zhu Zhanyou, Li Zhanping, Bai Shaoliang(Faculty of Civil Engineering, Chongqing University, Chongqing 400045, China)

Abstract:The column effective length l0 expression 7.3.11 in GB50010—2002 Code for Design of Concrete Structures used to calculate eccentricity augment coefficientηof column in sway concrete structures is approximately formula fitting theory solution from the member isolation method of sway column in elastic stability theory, which is adapt to multistory structures having general girder and column dimension. In some cases of frame portion of high buildings, large error will occur on this expression. The regularity of error between theory solution from the member isolation method and formula l0 in code are systematically analyzed, and two kinds of modifying fitting formula for engineering design and revising code are proposed.

Keywords:column; P-Δeffect; column effective length