RC框架梁柱节点的静力非线性有限元分析
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摘要
汶川地震震后调查发现:RC框架结构出现了与"强柱弱梁"设计目标不相符的"强梁弱柱"破坏形式.国内外学者研究表明:造成该现象的主要原因之一是目前抗震设计对现浇楼板使梁端负弯矩承载力增强考虑不充分造成的,有必要研究该影响程度.目前常用的研究方法有实验和有限元数值仿真2种,后者相对于前者更方便和简洁,但正确性较难保证.本文以非线性有限元软件ABAQUS为平台、通过框架结构中节点有限元模型的建立详细论述了各个参数的定义;随后对中节点进行了单调荷载下数值模拟,得到梁端荷载-位移曲线并与低周反复荷载实验的骨架曲线进行对比,发现两者基本吻合,从而验证了模型的正确性,为进一步研究RC框架结构屈服机制提供了合理的技术手段.
The survey of Wenchuan earthquake found that RC frame had emerged"strong columnweak beam"yield mechanism,but not"strong beam-weak column"which was the design goals.Studies showed:inadequate consideration of floor slab on of beam negative moment capacity enhancement in seismic design was the one of main causes.Therefore it was necessary to study the influence of cast-in-place floor on the beam flexural capacity.Now research methods have two ways of test method and numerical simulation,and the latter is more convenient and simple,but more difficult to guarantee the correctness compared with the former.So in this paper,in the platform of nonlinear finite element software ABAQUS,through the creation of the frame joint model,the parameters are discussed in detail,then the frame joint under monotonic loading have simulated.The results are basically consistent with the skeleton curve of test,which verify the correctness of the model.It provides a reasonable ways to further study the mechanism of RC frame structure yield technical.
The survey of Wenchuan earthquake found that RC frame had emerged"strong columnweak beam"yield mechanism,but not"strong beam-weak column"which was the design goals.Studies showed:inadequate consideration of floor slab on of beam negative moment capacity enhancement in seismic design was the one of main causes.Therefore it was necessary to study the influence of cast-in-place floor on the beam flexural capacity.Now research methods have two ways of test method and numerical simulation,and the latter is more convenient and simple,but more difficult to guarantee the correctness compared with the former.So in this paper,in the platform of nonlinear finite element software ABAQUS,through the creation of the frame joint model,the parameters are discussed in detail,then the frame joint under monotonic loading have simulated.The results are basically consistent with the skeleton curve of test,which verify the correctness of the model.It provides a reasonable ways to further study the mechanism of RC frame structure yield technical.
引文
[1]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[2]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25.WANG Yayong.Lessons learnt from building damages in the Wenchuan earthquake—seismic concept design of buildings[J].Journal of Building Structures,2008,29(4):20-25.
[3]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.LI Hongnan,XIAO Shiyun,HUO Linsheng.Damage investigation and analysis of engineering structures in the Wenchuanearthquake[J].Journal of Building Structures,2008,29(4):10-19.
[4]管民生,杜宏彪.现浇楼板参与工作后框架结构的pushover分析研究[J].地震工程与工程振动,2005,25(5):117-123.GUAN Minsheng,DU Hongbiao.Pushover analysis of effect of casting slab on RC frame structure[J].Earthquake Engi-neering and Engineering Vibration,2005,25(5):117-123.
[5]马千里,叶列平,陆新征,等.现浇楼板对框架结构柱梁强度比的影响研究[C]∥汶川地震建筑震害调查与灾后重建分析报告,北京:中国建筑工业出版社,2008:263-271.
[6]蒋永生,陈忠范.整浇楼板框架节点自控实验研究[J].东南大学学报,1994,24(3):59-64.JIANG Yongsheng,CHEN Zhongfan.Experimental research on self-control of frame joint with casting Slab[J].Journalof Southeast University,1994,24(3):59-64.
[7]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,15(6):11-16.JIANG Yongsheng,CHEN Zhongfan,ZHOU Xuping,et al.Aseismic research on RC frame joint of monolithically castedslab[J].Journal of Building Structures,1994,15(6):11-16.
[8]LéGERON F,PAULTRE P.Uniaxial confinement model for normal and high-strength concrete columns[J].StructEng,2003,129(2):241-252.
[9]GB50010—2002钢筋混凝土设计规范[S].
[10]JGJ10196建筑抗震实验方法规程[S].
[2]王亚勇.汶川地震建筑震害启示—抗震概念设计[J].建筑结构学报,2008,29(4):20-25.WANG Yayong.Lessons learnt from building damages in the Wenchuan earthquake—seismic concept design of buildings[J].Journal of Building Structures,2008,29(4):20-25.
[3]李宏男,肖诗云,霍林生.汶川地震震害调查与启示[J].建筑结构学报,2008,29(4):10-19.LI Hongnan,XIAO Shiyun,HUO Linsheng.Damage investigation and analysis of engineering structures in the Wenchuanearthquake[J].Journal of Building Structures,2008,29(4):10-19.
[4]管民生,杜宏彪.现浇楼板参与工作后框架结构的pushover分析研究[J].地震工程与工程振动,2005,25(5):117-123.GUAN Minsheng,DU Hongbiao.Pushover analysis of effect of casting slab on RC frame structure[J].Earthquake Engi-neering and Engineering Vibration,2005,25(5):117-123.
[5]马千里,叶列平,陆新征,等.现浇楼板对框架结构柱梁强度比的影响研究[C]∥汶川地震建筑震害调查与灾后重建分析报告,北京:中国建筑工业出版社,2008:263-271.
[6]蒋永生,陈忠范.整浇楼板框架节点自控实验研究[J].东南大学学报,1994,24(3):59-64.JIANG Yongsheng,CHEN Zhongfan.Experimental research on self-control of frame joint with casting Slab[J].Journalof Southeast University,1994,24(3):59-64.
[7]蒋永生,陈忠范,周绪平,等.整浇梁板的框架节点抗震研究[J].建筑结构学报,1994,15(6):11-16.JIANG Yongsheng,CHEN Zhongfan,ZHOU Xuping,et al.Aseismic research on RC frame joint of monolithically castedslab[J].Journal of Building Structures,1994,15(6):11-16.
[8]LéGERON F,PAULTRE P.Uniaxial confinement model for normal and high-strength concrete columns[J].StructEng,2003,129(2):241-252.
[9]GB50010—2002钢筋混凝土设计规范[S].
[10]JGJ10196建筑抗震实验方法规程[S].
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