[1]白绍良,朱思其,王敏,等.抗震框架柱端弯矩增大系数的构成因素识别及量化评价[J].地震工程与工程振动,2017,01(05):077-86.[doi:10.13197/j.eeev.2017.05.77.baisl.009]
 BAI Shaoliang,ZHU Siqi,WANG Min,et al.Composition identification and quantitative evaluation of column moment amplification factors for RC frame members in Chinese seismic design code[J].EARTHQUAKE ENGINEERING AND ENGINEERING DYNAMICS,2017,01(05):077-86.[doi:10.13197/j.eeev.2017.05.77.baisl.009]
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抗震框架柱端弯矩增大系数的构成因素识别及量化评价
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《地震工程与工程振动》[ISSN:/CN:]

卷:
01
期数:
2017年05期
页码:
077-86
栏目:
论文
出版日期:
2017-10-01

文章信息/Info

Title:
Composition identification and quantitative evaluation of column moment amplification factors for RC frame members in Chinese seismic design code
作者:
白绍良1 朱思其1 王敏1 朱爱萍2
1. 重庆大学 土木工程学院, 重庆 400045;
2. 中国建筑科学研究院, 北京 100013
Author(s):
BAI Shaoliang1 ZHU Siqi1 WANG Min1 ZHU Aiping2
1. College of Civil Engineering, Chongqing University, Chongqing 400045, China;
2. China Academy of Building Rearch, Beijing 100013, China
关键词:
抗震钢筋混凝土框架抗震措施柱端弯矩增大系数影响因素识别
Keywords:
earthquake-resistant RC frameseismic measuresfactor ηccomposition factor evaluatoin
分类号:
TU375.4
DOI:
10.13197/j.eeev.2017.05.77.baisl.009
摘要:
钢筋混凝土柱端弯矩增大系数是减缓柱端在强地面运动下形成屈服区,改善结构性能的重要抗震措施。目前虽已见有对中国规范取值有效性的分析评价结果,但对影响其取值的主要因素与影响程度则未见有关文章发表。本文设计了不同抗震等级的3个典型空间框架结构,通过对其非弹性动力反应分析结果的逐时点量化识别以及梁端抗弯能力超强的考察,识别出"梁端抗弯能力超强"和"节点处柱端弯矩比例从多遇到罕遇地震作用的增长率"是决定ηc取值的两个主要因素,而柱轴力从多遇到罕遇地震作用的变化则对ηc取值无明显影响。在完成以上两个主要因素定量统计的基础上,对各抗震等级ηc的合理取值作了进一步评价。
Abstract:
Using column moment amplification factor ηc in seismic design is one of key earthquake resisting measures for reinforced concrete (RC) frame members,which can promote a good yield distribution pattern and good performance and safety of structures under strong earthquakes. So far, although the effectiveness evaluation results of the factor ηc in Chinese design specification has been published, little research has been conducted to analyze the composition factor and quantitative evaluation of the factor ηc.Therefore, three regular RC frame structures were strictly designed according to the current Chinese code,which respectively located in seismic region 7(0.15g),8(0.20 g) and 9(0.40 g). Nonlinear dynamic analysis under multiple sets of rare earthquakes was finished. Dynamic response analysis results throughout the whole time and "beam moment overstrength" were calculated to indentify the composition factor. The two main factors that determine the value demand of ηc are as the following:the "beam moment overstrength" and the "moments proportion growth rate that in the rare level earthquake relative to the frequent level earthquake of the upper or lower column ends", which was under the premise that the beam end has generally yielded in the rare level. While the axial force change of the column in the rare level relative to the frequent level is of no significant effect. Based on the above quantitative analysis results of the two main factors of the three typical frameworks, the reasonable values of ηc for different seismic grades are further evaluated.

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备注/Memo

备注/Memo:
收稿日期:2016-11-05;改回日期:2017-01-08。
基金项目:国家自然科学基金青年基金项目(51408575)
作者简介:白绍良(1935-),男,教授,博士,主要从事结构工程抗震分析及抗震性能研究.E-mail:shaoliangbai@126.com
更新日期/Last Update: 2017-10-25