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工程科学与技术:2022,54(6):212-221
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双向地震输入下配高强钢筋的框架结构非弹性地震反应
(1.华南理工大学 土木与交通学院,广东 广州 510640;2.福建省送变电工程有限公司,福建 福州 350013)
Inelastic Seismic Response of Concrete Frame Structures Reinforced with High Strength Steel Bars Under Bi-directional Earthquake Inputs
(1.School of Civil Eng. and Transportation, South China Univ. of Technol., Guangzhou 510640, China;2.Fujian Transmission and Transformation Eng. Co., Ltd., Fuzhou 350013, China)
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投稿时间:2021-08-09    修订日期:2021-11-15
中文摘要: 为了研究配置不同高强钢筋的混凝土框架结构的抗震性能,在3个抗震设防烈度区根据现行规范分别设计按等强代换原则配置3种不同高强钢筋的空间框架结构,利用OpenSEES软件对该结构进行了多组双向水平地震动输入下的非弹性地震反应分析;以HRB400钢筋为基础,按等面积代换原则,将8、9度区结构的柱纵筋分别替换为HRB500及HRB600钢筋,完成相应非弹性地震反应分析,考察此做法对结构屈服机制的控制效果。结果表明:在同一防烈度区,随配筋强度的增大,结构的整体和局部位移响应呈小幅增大,而杆端出铰率及转角延性需求都有所下降,结构抗震性能有所提高。8、9度区采用HRB400及HRB500钢筋的结构,在罕遇地震作用下,形成以柱铰为主或柱铰偏多的梁柱铰混合耗能机制,其地震反应相对不利;采用HRB600钢筋之后,柱铰数量明显减少,抗震性能明显改善,但其柱端最大转角及其最大延性需求仍大于梁端,未能充分发挥梁端的良好耗能作用;将柱纵筋按等面积代换原则,由HRB400钢筋替换为更高强度钢筋后,柱承载力得到实质性加强,柱铰数量显著减少,梁铰数量增加,结构形成了以梁铰为主或梁铰较多的混合耗能机构,其整体抗震性能明显提高。
Abstract:To study the seismic behavior of concrete frame structures reinforced with different high strength steel bars, spatial concrete frames (Group 1) reinforced with three types of rebars but keeping the same moment-strength at every critical section were designed in three seismic intensity zones according to current design codes. Inelastic seismic response analyses of the frames were performed under bi-directional horizontal ground motion inputs with OpenSEES software. Meanwhile, based on the frames reinforced with HRB400 rebars, the longitudinal bars in columns of frames in Zone 8 and Zone 9 (Group 2) were replaced by HRB500 and HRB600 rebars with the same area-ratio, and corresponding seismic response analyses were conducted to investigate the control effects on the structural yielding mechanism. The result of Group 1 showed that in the same seismic fortification zone, with the growth of the rebar strength, the whole displacements and local displacements of the frames increased slightly, but hinge ratios and rotation ductility demands decreased, which indicated better seismic performance in frames. The frames in Zone 8 and Zone 9 reinforced with HRB400 and HRB500 rebars demonstrated a column-hinge-dominated energy dissipation mechanism or one with more column hinges than beam hinges under rare-earthquake inputs, which implying an unfavorable seismic response. The counterpart frames reinforced with HRB600 rebar exhibited a notable improvement in seismic performance with significantly reduced column hinges, but maximum rotation and ductility demands of columns were larger than those of beams, which indicating failure in making full use of good energy dissipation of beams. The result of Group 2 showed that when the longitudinal bars of HRB400 in columns were replaced by higher-strength rebars with the same area ratio, the moment capacities of columns were enhanced substantially. Column hinges significantly reduced meanwhile beam hinges significantly increased, and the frames formed a beam-hinge-dominated energy dissipation mechanism, which indicating a noticeable improvement in the overall seismic performance of the structures.
文章编号:202100778     中图分类号:TU973.31;TU375    文献标志码:
基金项目:国家自然科学基金项目(51678252);广西科技攻关计划项目(桂科攻12100005)
作者简介:第一作者:韦锋(1970-),男,副教授,博士.研究方向:工程结构抗震.E-mail:ctfwei@scut.edu.cn
引用文本:
韦锋,张思帆,张伟,苏成.双向地震输入下配高强钢筋的框架结构非弹性地震反应[J].工程科学与技术,2022,54(6):212-221.
WEI Feng,ZHANG Sifan,ZHANG Wei,SU Cheng.Inelastic Seismic Response of Concrete Frame Structures Reinforced with High Strength Steel Bars Under Bi-directional Earthquake Inputs[J].Advanced Engineering Sciences,2022,54(6):212-221.