框架梁刚度放大系数对结构的影响及合理取值
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摘要
为了降低框架结构的梁配筋,间接考虑楼板对梁的承载力贡献,以实现"强柱弱梁"的设计理念。通过对一组4层3跨的钢筋混凝土框架结构进行Etabs建模有限元分析,考虑不同形式梁对楼板刚度贡献,分析了中梁刚度放大系数取值对框架结构分析结果的影响,以考虑楼板平面外刚度与放大梁刚度2种情况的框架结构弹性基本自振周期相等原则,近似确定楼板对框架梁弹性刚度的影响范围,求出理论计算值。分析结果表明:在现有条件下,框架梁刚度放大系数取值对梁配筋的敏感性要高于柱;可以对不同设防烈度框架结构采用不同的梁刚度放大系数,以提高经济性;给出梁刚度放大系数的建议值,提出了框架柱塑性铰区梁、板之间分缝的设计建议。
In order to reduce the beam reinforcement of the frame structure with the consideration of the contribution of floor to the bearing capacity of beams and achieve"strong-column and weak-beam"design,a four-story three-span reinforced concrete frame was used for the simulation by Etabs for finite element analysis,with the consideration of the contribution of different kinds of beams to the floor rigidity,to analyze the influence of amplification factor of frame beams on the frame structure.The equivalence of basic natural period of vibration theory invloving out-ofplane rigidity and amplication of beam rigidity was adopted for approximate determination of the influence range of floor on the frame elastic rigidity,and the theoretical value was deduced.The results show that the rigidity amplification factor of beams is more sensitive to the beam reinforcement than the column under current conditons;different rigidity amplification factors of beams should be applied to different seismic fortification intensities to improve the economy;the proposed value of rigidity amplification factor of beam is presented;and horizontal joints should be set in the beam's plastic hinge zone between the beam and slab.1tab,4figs,9refs.
In order to reduce the beam reinforcement of the frame structure with the consideration of the contribution of floor to the bearing capacity of beams and achieve"strong-column and weak-beam"design,a four-story three-span reinforced concrete frame was used for the simulation by Etabs for finite element analysis,with the consideration of the contribution of different kinds of beams to the floor rigidity,to analyze the influence of amplification factor of frame beams on the frame structure.The equivalence of basic natural period of vibration theory invloving out-ofplane rigidity and amplication of beam rigidity was adopted for approximate determination of the influence range of floor on the frame elastic rigidity,and the theoretical value was deduced.The results show that the rigidity amplification factor of beams is more sensitive to the beam reinforcement than the column under current conditons;different rigidity amplification factors of beams should be applied to different seismic fortification intensities to improve the economy;the proposed value of rigidity amplification factor of beam is presented;and horizontal joints should be set in the beam's plastic hinge zone between the beam and slab.1tab,4figs,9refs.
引文
[1]叶列平,曲哲,马千里,等.从汶川地震中框架结构震害谈“强柱弱梁”屈服机制的实现[J].建筑结构,2008,38(11):52-59.YE Lie-ping,QU Zhe,MA Qian-li,et al.Study on en-suring the strong column-weak beam mechanism forRC frames based on the damage analysis in the Wen-chuan earthquake[J].Building Structure,2008,38(11):52-59.(in Chinese)
[2]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,1994,12(3):11-15.JIANG Yong-sheng,CHEN Zhong-fan,ZHOU Xu-ping,et al.Aseismic research on RC frame joint ofmonolithically casted slab[J].Journal of BuildingStructures,1994,12(3),11-15.(in Chinese)
[3]JGJ3—2010,高层建筑混凝土结构技术规程[S].JGJ3—2010,Technical specification for concretestructures of tall building[S].(in Chinese)
[4]ACI committee 318,2002,Building code requirementsfor structural concrete(ACI 318-02)and commentary(ACI 318R-02)[S].
[5]王素裹,韩小雷,季静.现浇楼板对RC框架结构破坏形式的影响分析[J].土木建筑与环境工程,2009,31(1):66-71.WANG Su-guo,HAN Xiao-lei,JI Jing.The effect ofslabs on the failure mode of reinforced concrete framestructures[J].Journal of Civil,Architectural&Envi-ronmental Engineering,2009,31(1):66-71.(in Chi-nese)
[6]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.TANG Jiu-ru.Reinforced concrete frame joints aseis-mic[M].Nanjing:Southeast University Press,1989.(in Chinese)
[7]GB 50011—2001,建筑抗震设计规范(2010年版)[S].GB 50011—2001,Gode for seismic design of buildings(2010Edition)[S].(in Chinese)
[8]GB 50010—2002,混凝土结构设计规范[S].GB 50010—2002,Gode for design of concrete struc-tures[S].(in Chinese)
[9]GB 50010—2010,混凝土结构设计规范[S].GB 50010—2010,Gode for design of concrete struc-tures[S].(in Chinese)
[2]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,1994,12(3):11-15.JIANG Yong-sheng,CHEN Zhong-fan,ZHOU Xu-ping,et al.Aseismic research on RC frame joint ofmonolithically casted slab[J].Journal of BuildingStructures,1994,12(3),11-15.(in Chinese)
[3]JGJ3—2010,高层建筑混凝土结构技术规程[S].JGJ3—2010,Technical specification for concretestructures of tall building[S].(in Chinese)
[4]ACI committee 318,2002,Building code requirementsfor structural concrete(ACI 318-02)and commentary(ACI 318R-02)[S].
[5]王素裹,韩小雷,季静.现浇楼板对RC框架结构破坏形式的影响分析[J].土木建筑与环境工程,2009,31(1):66-71.WANG Su-guo,HAN Xiao-lei,JI Jing.The effect ofslabs on the failure mode of reinforced concrete framestructures[J].Journal of Civil,Architectural&Envi-ronmental Engineering,2009,31(1):66-71.(in Chi-nese)
[6]唐九如.钢筋混凝土框架节点抗震[M].南京:东南大学出版社,1989.TANG Jiu-ru.Reinforced concrete frame joints aseis-mic[M].Nanjing:Southeast University Press,1989.(in Chinese)
[7]GB 50011—2001,建筑抗震设计规范(2010年版)[S].GB 50011—2001,Gode for seismic design of buildings(2010Edition)[S].(in Chinese)
[8]GB 50010—2002,混凝土结构设计规范[S].GB 50010—2002,Gode for design of concrete struc-tures[S].(in Chinese)
[9]GB 50010—2010,混凝土结构设计规范[S].GB 50010—2010,Gode for design of concrete struc-tures[S].(in Chinese)
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