组合结构桥梁抗震潜力及性能研究
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摘要
针对钢-混凝土组合结构桥梁与普通混凝土桥梁在质量和刚度上的显著区别,以某四跨连续梁桥为研究背景,通过建立简化单自由度分析模型,利用反应谱法计算结构地震需求,讨论了不同场地条件下结构质量、墩身刚度等因素对地震作用下结构地震响应的影响,并通过比较混凝土主梁+实心墩、组合结构主梁+实心墩和组合结构主梁+空心墩三种方案的地震响应,全面分析了组合结构桥梁地震作用下的抗震潜能。研究表明:组合结构桥梁方案可以有效降低结构的地震力需求,具有优越的抗震潜力及性能。
For the significant differences in structural weight and stiffness between a steel-concrete composite bridge and a concrete bridge,a four-span continuous bridge was taken as an example,a simplified SDOF model was built and the seismic demands were calculated with response spectrum method.The effects of the factors on seismic response of the bridge such as the weight of a superstructure,the stiffness of a column section,etc.are investigated through a parametric study.The aseismic potential and performance for a composite bridge are investigated by the comparison of seismic responses among a concrete bridge with solid columns,a composite bridge with solid columns and a composite bridge with hollow columns.It is shown that composite bridges have lower seismic demands than concrete bridges;composite bridges have superior aseismic potential and performance.
For the significant differences in structural weight and stiffness between a steel-concrete composite bridge and a concrete bridge,a four-span continuous bridge was taken as an example,a simplified SDOF model was built and the seismic demands were calculated with response spectrum method.The effects of the factors on seismic response of the bridge such as the weight of a superstructure,the stiffness of a column section,etc.are investigated through a parametric study.The aseismic potential and performance for a composite bridge are investigated by the comparison of seismic responses among a concrete bridge with solid columns,a composite bridge with solid columns and a composite bridge with hollow columns.It is shown that composite bridges have lower seismic demands than concrete bridges;composite bridges have superior aseismic potential and performance.
引文
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[2]Brozzetti J.Design development of steel-concrete composite bridges in France[J].Journal of Constructional Steel Research,2000,55(1):229―243.
[3]Nielson B G,Desroches R.Seismic performance assessment of simply supported and continuous multispan concrete girder highway bridges[J].Journal of Bridge Engineering,2007,12(5):611―620.
[4]Hanswille G.Composite bridge recently built in Germany[C].Composite Bridges―State of the Art in Technology and Analysis,Proceedings of the3rd International Meeting.Madrid,2001:97―109.
[5]邵长宇.组合结构桥梁―国际发展与国内展望[C].第18届全国桥梁学术会议论文集.北京:人民交通出版社,2008:150―158.Shao Changyu.Composite bridge-international development and domestic outlook[C].Proceedings of the18th China Bridge Conference.Beijing:China Communications Press,2008:150―158.(in Chinese)
[6]JTG/TB02-01-2008,公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.JTG/TB02-01-2008,Seismic design guidelines for highway bridges[S].Beijing:China Communications Press,2008.(in Chinese)
[7]Gupta A K.Response spectrum method in seismic analysis and design of structures[M].Boca Raton,Fla.:CRC Press,1992.
[8]Sharpe R L.Seismic design guidelines for highway bridges[M].Berkeley,Calif.:Applied Technology Council,1981.
[9]范立础.桥梁抗震[M].上海:同济大学出版社,1997.Fan Lichu.Bridge seismic[M].Shanghai:Tongji University Press,1997.(in Chinese)
[10]Choi E,Kim H.Seismic performance of steel bridges with parameters[J].KSCE Journal of Civil Engineering,2002,6(4):457―467.
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