（西北农林科技大学水利与建筑工程学院， 杨凌 712100）

［摘要］钢筋混凝土框架结构的抗倒塌能力与其破坏机制密切相关，最理想的机制是梁铰机制，即“强柱弱梁”型框架结构。研究表明，柱端弯矩增大系数（COF）对“强柱弱梁”型框架结构的形成有很大的影响，当COF大于2时，结构基本上只发生梁铰失效模式的破坏。采用现行《混凝土结构设计规范》（GB 50010—2010）提供的梁、柱受弯承载力计算公式，根据6组不同设防烈度下钢筋混凝土框架结构实配钢筋施工图，求出梁、柱节点的COF值。对不符合“强柱弱梁”要求的框架结构梁、柱实配配筋进行调整，COF最小值取1.1～1.2左右。可知在罕遇地震作用下，一级抗震等级框架结构基本上只发生梁铰失效模式的破坏。建议规范将二、三级抗震等级框架结构的COF按照梁端实配钢筋计算，确保框架结构最终施工图能够真正实现“强柱弱梁”的概念设计。

［关键词］强柱弱梁； 实配钢筋； 柱端弯矩增大系数； 施工图

中图分类号：TU375.4文献标识码：A文章编号：1002-848X(2016)02-0019-07

Formation factor analysis of strong column-weak beam typed real reinforced frame structure

Zhang Wenli

( College of Water Resources and Architecture Engineering， North West A & F University， Yangling 712100， China)

Abstract:Collapse capability of reinforced concrete frame structure is closely related to its failure mechanism and the most ideal mechanism is beam-hinge mechanism, namely strong column-weak beam typed frame structure. Research shows that Column Overdesign Factor（COF）has a great influence on the formation of strong column-weak beam typed frame structure. When COF is more than 2, the structure basically only produces beam-hinge failure mode. The beam and column flexural bearing capacity calculation formulas provided by the present Code for design of concrete structures (GB 50010—2010) were used to calculate COF values of the beam and column nodes according to the real reinforced construction drawings of 6 groups of reinforced concrete frame structures under different seismic fortification intensities. The real reinforced of  frame structure columns and beams were adjusted if they are inconsistent with the strong column-weak beam requirements, and the minimum value of COF is about 1.1～1.2. It is known that under the rare earthquake, basically only beam-hinge failure mode occurs in frame structure with first seismic level. It is suggested that COF of frame structures with second and third seismic levels should be calculated according to the real reinforced beam end conditions in concrete code, to ensure that the conceptual design of strong column and weak beam can be truly achieved in final construction drawings of frame structures.

Keywords:strong column-weak beam; real reinforced; Column Overdesign Factor (COF); construction drawing

作者简介：张文利，副研究员，Email：cszwl_yl@163.com。