楼板参与作用对RC框架结构抗倒塌能力影响
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摘要
通过Pushover方法,评估了楼板参与作用对RC框架结构整体承载力和变形能力的影响。结果表明,由于楼板增加了梁柱线刚度比及梁的受压区面积,这一抗弯刚度贡献提高了结构的超强系数和延性系数。"超配"的板筋虽有利于提高结构的超强系数,但降低了结构的变形能力。因此,在进行框架梁设计时,应恰当地考虑楼板的刚度贡献及减小有效翼缘宽度内板筋的作用,以使结构获得更好的抗倒塌能力。
Pushover analysis was performed to investigate the effects of floor slab on the integrity strength and deformation capacity of RC frame structures.The results show that,owing to the contribution of floor slab to the beam bending stiffness including the augment of line stiffness ratio of beam and column and the flexural pressure areas of beam,over strength factor and ductility ratio of the structure are improved.Despite the fact that additional reinforcement in slab appreciably advances over strength factor of the structure,ductility of the structure gets worse.Consequently,while designing frame beam,the amplification of beam bending stiffness due to slab should be appropriately taken into account and the additional contribution of the distributed reinforcement along the beam in the effective width of slab should be reduced,so that the structure can attain better collapse-resistance capacity.
Pushover analysis was performed to investigate the effects of floor slab on the integrity strength and deformation capacity of RC frame structures.The results show that,owing to the contribution of floor slab to the beam bending stiffness including the augment of line stiffness ratio of beam and column and the flexural pressure areas of beam,over strength factor and ductility ratio of the structure are improved.Despite the fact that additional reinforcement in slab appreciably advances over strength factor of the structure,ductility of the structure gets worse.Consequently,while designing frame beam,the amplification of beam bending stiffness due to slab should be appropriately taken into account and the additional contribution of the distributed reinforcement along the beam in the effective width of slab should be reduced,so that the structure can attain better collapse-resistance capacity.
引文
[1]清华大学土木结构组,西南交通大学土木结构组,北京交通大学土木结构组.汶川地震建筑震害分析[J].建筑结构学报,2008,29(4):1-9.
[2]清华大学,西南交通大学,重庆大学,等.汶川地震建筑震害分析及设计对策[M].北京:中国建筑工业出版社,2009.
[3]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.
[4]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.
[5]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]吴勇,雷汲川,杨红,等.板筋参与梁端负弯矩承载力问题的探讨[J].重庆建筑大学学报,2002,24(3):33-37.
[7]ACI318—08Building code requirements for structural concrete and commentary[S].American Concrete Institute,2008.
[8]NZS3101Concrete structures standard[S].New Zealand Standard,2006.
[9]CSA A23.3—04Design of concrete structures[S].Canadian Standards Association,2004.
[10]BS EN1998-1Eurocode8:Design of structures for earthquake resistance[S].European Committee for Standardization,2004.
[11]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[12]WHITTAKER A,HART G,ROJAHN C.Seismic response modification factors[J].Journal of Structural Engineering,1999,125(4):438-444.
[13]陆新征,叶列平,缪志伟,等.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2009.
[14]MANDER J,PRIESTLEY J,PARK R.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826.
[15]LGERON F,PAULTRE P.Uniaxial confinement model for normal-and high-strength concrete columns[J].Journal of Structural Engineering,2003,129(2):241-252.
[2]清华大学,西南交通大学,重庆大学,等.汶川地震建筑震害分析及设计对策[M].北京:中国建筑工业出版社,2009.
[3]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.
[4]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.
[5]GB50011—2010建筑抗震设计规范[S].北京:中国建筑工业出版社,2010.
[6]吴勇,雷汲川,杨红,等.板筋参与梁端负弯矩承载力问题的探讨[J].重庆建筑大学学报,2002,24(3):33-37.
[7]ACI318—08Building code requirements for structural concrete and commentary[S].American Concrete Institute,2008.
[8]NZS3101Concrete structures standard[S].New Zealand Standard,2006.
[9]CSA A23.3—04Design of concrete structures[S].Canadian Standards Association,2004.
[10]BS EN1998-1Eurocode8:Design of structures for earthquake resistance[S].European Committee for Standardization,2004.
[11]GB50010—2010混凝土结构设计规范[S].北京:中国建筑工业出版社,2011.
[12]WHITTAKER A,HART G,ROJAHN C.Seismic response modification factors[J].Journal of Structural Engineering,1999,125(4):438-444.
[13]陆新征,叶列平,缪志伟,等.建筑抗震弹塑性分析[M].北京:中国建筑工业出版社,2009.
[14]MANDER J,PRIESTLEY J,PARK R.Theoretical stress-strain model for confined concrete[J].Journal of Structural Engineering,1988,114(8):1804-1826.
[15]LGERON F,PAULTRE P.Uniaxial confinement model for normal-and high-strength concrete columns[J].Journal of Structural Engineering,2003,129(2):241-252.
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