强震区轻骨料混凝土桥梁地震响应研究
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摘要
为研究轻骨料混凝土桥梁的地震响应,以一座强震区典型连续梁桥为研究对象,在考虑轻骨料混凝土材料特性基础上建立桥梁结构有限元分析模型,采用非线性动力时程分析法进行结构地震响应分析,研究轻骨料混凝土材料布设位置对桥梁结构动力特性和地震响应的影响,并从内力和位移响应方面与普通混凝土桥梁进行对比。结果表明:与普通混凝土桥梁相比,仅上部结构或仅下部结构采用轻骨料混凝土对降低桥墩内力并不明显,而全桥采用轻骨料混凝土能够显著降低桥墩内力。轻骨料混凝土桥梁与普通混凝土桥梁地震内力和位移响应变化趋势不同,桥墩塑性发展程度和时间存在差异。采用轻骨料混凝土桥梁方案时,应综合考虑结构质量、刚度分布及材料塑性特性与普通混凝土桥梁的不同,合理确定抗震设计方案。
In order to study the seismic response of the lightweight aggregate concrete bridges, a typical continuous beam bridge in the earthquake-prone area was selected as the research object. Based on the characteristics of lightweight aggregate concrete materials, the finite element model of the bridge structure was established. Nonlinear dynamic time-history analysis was used to study the influence of the location of the lightweight aggregate concrete material on the dynamic characteristics and seismic responses of the bridge structure, and its internal force and displacement responses were compared with those of the conventional concrete bridge. The results show that the use of lightweight aggregate concrete for only the superstructure or substructure can not reduce the internal force of the pier significantly, while its use for the entire bridge can. The trend of seismic internal force and displacement responses of the bridges and the plasticity development of the piers are different with those of the ordinary concrete bridges. When the lightweight aggregate concrete bridge scheme is adopted, the difference of the structural quality, stiffness distribution and material plasticity characteristics with the ordinary concrete bridges should be comprehensively considered, and a reasonable seismic design scheme should be applied.
In order to study the seismic response of the lightweight aggregate concrete bridges, a typical continuous beam bridge in the earthquake-prone area was selected as the research object. Based on the characteristics of lightweight aggregate concrete materials, the finite element model of the bridge structure was established. Nonlinear dynamic time-history analysis was used to study the influence of the location of the lightweight aggregate concrete material on the dynamic characteristics and seismic responses of the bridge structure, and its internal force and displacement responses were compared with those of the conventional concrete bridge. The results show that the use of lightweight aggregate concrete for only the superstructure or substructure can not reduce the internal force of the pier significantly, while its use for the entire bridge can. The trend of seismic internal force and displacement responses of the bridges and the plasticity development of the piers are different with those of the ordinary concrete bridges. When the lightweight aggregate concrete bridge scheme is adopted, the difference of the structural quality, stiffness distribution and material plasticity characteristics with the ordinary concrete bridges should be comprehensively considered, and a reasonable seismic design scheme should be applied.
引文
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[12] 高英力,龙杰,刘赫.粉煤灰高强轻骨料混凝土早期自收缩及抗裂性试验研究[J].硅酸盐通报,2013,32(6):1-6GAO Yingli,LONG Jie,LIU He.Experimental Study on early self-shrinkage and crack resistance of fly ash high strength lightweight aggregate concrete[J].Bulletin Bulletin,2013,32(6):1-6.(in Chinese)
[13] BAO Sheng Zhang,LI Juan Kong,YONG Ge.Influence of lightweight aggregate on durability of high performance concrete[J].Key Engineering Materials,2009,802(405).
[14] JIAN C.LIM,Togay Ozbakkaloglu.Stress–strain model for normal and light-weight concretes under uniaxial and triaxial compression[J].Construction and Building Materials,2014,71.
[15] 王振宇,丁建彤,郭玉顺.结构轻骨料混凝土的应力-应变全曲线[J].混凝土,2005(3):39-41+66.WANG Zhenyu,DING Jianwei,GUO Yushun.Stress-strain full curve of structural lightweight aggregate concrete[J].Concrete,2005(3):39-41+66 .(in Chinese)
[16] JTJ/T B02-01-2008.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTJ/T B02-01-2008.Seismic Design Rules for highway bridges [S].Beijing:China Communications Press,2008.(in Chinese)
[17] CJJ166-2011.城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ166-2011.Code for Seismic Design of Urban Bridges [S].Beijing:China Building Industry Press,2011.(in Chinese)
[2] M.Mouli,H.Khelafi.Strength of short composite rectangular hollow section columns filled with lightweight aggregate concrete[J].Engineering Structures,2006,29(8).
[3] 刘哲锋,苏志力,杨伟军.轻骨料混凝土与普通混凝土框架结构的抗震性能分析[J].建筑结构,2010,40(2):22-24+32.LIU Zhefeng,SU Zhili,YANG Weijun.Analysis of seismic behavior of lightweight aggregate concrete and conventional concrete Frame Structures[J].Building Structure,2010,40(2):22-24+32 .(in Chinese)
[4] 曹诚,王春阳,刘兰强.高强页岩粉煤灰陶粒混凝土在天津永定新河大桥中的应用[J].粉煤灰,2001(1):20-21.CAO Cheng,WANG Chunyang,LIU Lanqiang.Application of high strength shale fly ash ceramsite concrete in Tianjin Yongding Xinhe Bridge[J].Fly Ash,2001(1):20-21.(in Chinese)
[5] 董金道,徐峯.陶粒混凝土在上海卢浦大桥(引桥)工程中的应用[J].房材与应用,2004(6):4-5.DONG Jindao,XU Feng.Application of ceramsite concrete in Shanghai Lupu Bridge (Induced Bridge) project [J].Housing Materials and Applications,2004 (6):4-5 .(in Chinese)
[6] 黄盛楠,刘英奎,叶列平,等.预应力高强轻骨料混凝土连续刚构桥的试验研究[J].工程力学,2007(S1):134-140.HUANG Shengnan,LIU Yingkui,YE Liping,et al.Experimental study on prestressed high strength lightweight aggregate concrete continuous rigid frame bridge[J].Engineering Mechanics,2007(S1):134-140.(in Chinese)
[7] 刘伯权,刘喜,王旭辉,等.高强轻骨料混凝土框架抗震性能试验研究与数值模拟[J].世界地震工程,2015,31(1):8-15.LIU Boquan,LIU Xi,WANG Xuhui,et al.Experimental study and numerical simulation of seismic behavior of frame with high-strength lightweight aggregate concrete [J].World Earthquake Engineering,2015,31(1):8-15 .(in Chinese)
[8] 刘数华,阎培渝.高性能轻骨料混凝土在桥梁工程中应用的研究进展[J].公路,2006(8):176-180.LIU Shuhua,PEI Peiyu.Research progress of application of high performance lightweight aggregate concrete in bridge Engineering[J].Highway,2006(8):176-180 .(in Chinese)
[9] 沈永林,马芸仙.普通混凝土和轻质混凝土高墩桥抗震性能及经济性比较[J].公路,2009(3):48-51.SHEN Yonglin,MA Yuxian.Comparison of seismic performance and economic performance of ordinary concrete and lightweight concrete high pier bridges[J].Highway,2009(3):48-51.(in Chinese)
[10] JGJ 12—2006.轻骨料混凝土结构技术规程[S].北京:中国建筑工业出版社,2006JGJ 12—2006.Technical specification for lightweight aggregate concrete structures [S].Beijing:China Building Industry Press,2006.(in Chinese)
[11] 王建民,袁丽莉,汪能君,等.高温加热后轻骨料混凝土力学性能实验研究[J].自然灾害学报,2014,23(1):1-6WANG Jianmin,YUAN Lili,WANG Nengjun,et al.Experimental study on mechanical properties of lightweight aggregate concrete after high temperature heating[J].Journal of Natural Disasters,2014,23(1):1-6.(in Chinese)
[12] 高英力,龙杰,刘赫.粉煤灰高强轻骨料混凝土早期自收缩及抗裂性试验研究[J].硅酸盐通报,2013,32(6):1-6GAO Yingli,LONG Jie,LIU He.Experimental Study on early self-shrinkage and crack resistance of fly ash high strength lightweight aggregate concrete[J].Bulletin Bulletin,2013,32(6):1-6.(in Chinese)
[13] BAO Sheng Zhang,LI Juan Kong,YONG Ge.Influence of lightweight aggregate on durability of high performance concrete[J].Key Engineering Materials,2009,802(405).
[14] JIAN C.LIM,Togay Ozbakkaloglu.Stress–strain model for normal and light-weight concretes under uniaxial and triaxial compression[J].Construction and Building Materials,2014,71.
[15] 王振宇,丁建彤,郭玉顺.结构轻骨料混凝土的应力-应变全曲线[J].混凝土,2005(3):39-41+66.WANG Zhenyu,DING Jianwei,GUO Yushun.Stress-strain full curve of structural lightweight aggregate concrete[J].Concrete,2005(3):39-41+66 .(in Chinese)
[16] JTJ/T B02-01-2008.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTJ/T B02-01-2008.Seismic Design Rules for highway bridges [S].Beijing:China Communications Press,2008.(in Chinese)
[17] CJJ166-2011.城市桥梁抗震设计规范[S].北京:中国建筑工业出版社,2011.CJJ166-2011.Code for Seismic Design of Urban Bridges [S].Beijing:China Building Industry Press,2011.(in Chinese)
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