华南理工大学学报(自然科学版) ›› 2016, Vol. 44 ›› Issue (2): 8-13.doi: 10.3969/j.issn.1000-565X.2016.02.002

• 土木建筑工程 • 上一篇    下一篇

对称撞击下钢筋混凝土框架结构的非线性响应

魏德敏1,2 刘德源1 李頔1   

  1. 1. 华南理工大学 土木与交通学院,广东 广州 510640; 2. 华南理工大学 亚热带建筑科学国家重点实验室, 广东 广州 510640
  • 收稿日期:2015-03-10 修回日期:2015-10-10 出版日期:2016-02-25 发布日期:2016-01-04
  • 通信作者: 魏德敏(1955-) ,女,教授,博士生导师,主要从事土木工程结构防灾减灾研究. E-mail:dmwei@scut.edu.cn
  • 作者简介:魏德敏(1955-) ,女,教授,博士生导师,主要从事土木工程结构防灾减灾研究.
  • 基金资助:
    国家自然科学基金资助项目( 51025829)

Nonlinear Response of Reinforced Concrete Frame Structures Under Symmetrical Impact

WEI De-min1,2 LIU De-yuan1 LI Di1   

  1. 1.School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2015-03-10 Revised:2015-10-10 Online:2016-02-25 Published:2016-01-04
  • Contact: 魏德敏(1955-) ,女,教授,博士生导师,主要从事土木工程结构防灾减灾研究. E-mail:dmwei@scut.edu.cn
  • About author:魏德敏(1955-) ,女,教授,博士生导师,主要从事土木工程结构防灾减灾研究.
  • Supported by:
    Supported by the National Nutural Science Foundation of China( 51025829)

摘要: 对钢筋混凝土框架结构在集中对称撞击荷载作用下的非线性动力响应进行理论分析. 分析中考虑了落锤初始撞击速度及梁柱线刚度比的影响,并通过非线性有限元分析得到撞击力随时间变化的规律、结构的位移响应和最终变形,确定了结构塑性变形的特性及耗能情况. 通过分析计算结果,提出估算框架结构受撞击处最终变形的简化分析模型,进行了简化计算结果与有限元分析结果的对比,发现: 相对于梁柱线刚度比,初始撞击速度对结构撞击响应的影响较大; 框架结构的塑性变形主要集中在框架梁两端及跨中,且框架梁的塑性变形随着初始撞击速度的提高明显增大; 框架柱有对称向外的水平位移,塑性变形相对较小.

关键词: 钢筋混凝土框架结构, 对称撞击, 初始撞击速度, 线刚度比, 非线性动力响应, 有限元分析

Abstract: Dealt with in this paper is the nonlinear dynamic response of reinforced concrete frame structures under symmetrical centralized impacts.In the investigation,first,two influencing factors,namely the initial impact velocity of the drop hammer and the beam-to-column linear stiffness ratio,are analyzed.Next,a nonlinear finite element analysis is performed to explore the variations of the impact force with time,the displacement response of the structure,the final deformation,the characteristics of the plastic deformation and the energy consumption of the structure.Then,the computational results are analyzed and a simplified model to estimate the final deformation of the impact point is put forward.Finally,a comparison is made between the results respectively obtained by the finite- element computation and the simplified model.It is found that ( 1) the influence of initial impact velocity on the structure's dynamic response is more evident than that of the beam-to-column linear stiffness ratio; ( 2) the plastic deformation of the frame structure mainly occurs at the two ends and in the midpoint of the beam,which greatly increases with the increase of the initial impact velocity; and ( 3) the horizontal displacement of the two frame columns is symmetrically outward and the plastic deformation of the column is relatively smaller than that of the beam.

Key words: reinforced concrete frame structure, symmetrical impact, initial impact velocity, linear stiffness ratio, nonlinear dynamic response, finite element analysis

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