RC框架结构产生“强梁弱柱”的震害分析

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英文篇名：The Earthquake Damage Analysis of RC Frame Structure with Strong Beam and Weak Column 中文刊名：建筑科学 英文刊名：Building Science 作者：毋剑平 ; 杨小卫 英文作者：WU Jian-ping ; YANG Xiao-wei(China Academy of Building Research ; Beijing 100013 ; China) 中文关键词：汶川地震 ; RC框架 ; 强梁弱柱 英文关键词：Wenchuan earthquake ; RC frame ; strong beam and weak column 出版日期：2011-01-20 机构：中国建筑科学研究院; 年：2011 期：01 出版单位：建筑科学

摘要

结合《建筑抗震设计规范(GB 50011-2001)》的相关规定,以汶川地震中映秀镇漩口中学食堂为例,采用常用的简化力学模型进行设计计算并与震害现象进行对比。得出RC框架结构中虽然设计计算考虑楼板对梁的刚度贡献,并由此梁端弯矩设计值进行梁端矩形截面配筋设计。但是由于没考虑板筋对梁端承载力的贡献,即使柱端增大了弯矩设计值,也在低烈度设防区形成"强梁弱柱"的结构。
The dinning room of Xuankou middle school in Wenchuan county is used as a simplified model in this paper.According to the code for seismic design of buildings(GB50011-2001),the calculation result based on the simplified model is compared to the earthquake damage.The comparison shows that the increasing of the beam stiffness caused by the stiffness of the slab is considered when the bending moment of two ends of the beam is calculated,and the beam reinforcement is calculated according to this moment.In the same time,the increasing of the bearing capacity of the beam caused by the reinforcement in the slab is ignored.The ignoring brings the RC frame structure with"strong beam and weak column"to the areas with low seismic fortification intensity.

引文

[1]国家标准GB 50011-2001.建筑抗震设计规范[S].
    [2]国家标准GB 50010-2002.混凝土结构设计规范[S].
    [3]王亚勇,王言诃.汶川大地震建筑震害启示[J].建筑结构,2008,38(7):1～6.