中低设防烈度地区全无缝桥梁抗震性能分析
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摘要
为了准确地模拟接线路面特性,对其荷载-变形和损伤进行了分析,提出了接线路面板集中弹簧简化模型.基于此,采用SAP2000建立了某座全无缝桥梁动力计算模型.对该桥进行了模态分析和地震时程分析,并与对应连续梁桥进行了对比分析;同时还进行了桥长和接线路面刚度敏感性分析.研究结果表明:中低设防烈度地区,全无缝桥梁的地震响应只有连续梁桥的24%～35%,主桥处于弹性无损状态.可见,全无缝桥梁能大幅提升中低烈度地区公路中小桥梁的抗震性能.
To accurately simulate the characteristics of continuously reinforced concrete approach pavement(CRCAP),a simplified concentrated spring model was proposed according to the force-deformation curve and the damage level of the CRCAP.Based on this,a dynamic finite element model of a semi-integral fully jointless bridge(SFJB)was established with SAP2000.The Modal analysis and Time History analysis were carried out on both the SFJB and the continuous girder bridge(CGB)for comparison.The sensitivity analysis of seismic performance was also investigated.The results indicate that the seismic response of the SFJB is only 24%～35%of the CGB in the low seismic fortification intensity zone,which can greatly enhance the seismic resistance of small and medium bridges.
To accurately simulate the characteristics of continuously reinforced concrete approach pavement(CRCAP),a simplified concentrated spring model was proposed according to the force-deformation curve and the damage level of the CRCAP.Based on this,a dynamic finite element model of a semi-integral fully jointless bridge(SFJB)was established with SAP2000.The Modal analysis and Time History analysis were carried out on both the SFJB and the continuous girder bridge(CGB)for comparison.The sensitivity analysis of seismic performance was also investigated.The results indicate that the seismic response of the SFJB is only 24%～35%of the CGB in the low seismic fortification intensity zone,which can greatly enhance the seismic resistance of small and medium bridges.
引文
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[2]AROCKIASAMY M,BUTRIENG N,SIVAKUMAR M.State-of-the-art of integral abutment bridges:design and prac-tice[J].Journal of Bridge Engineering,2004,9(5):497-506.
[3]RODOLFO F M,SAMER H P.Integral abutments and joint-less bridges(IAJB)2004survey summary[C]//FHWA Con-ference.Baltimore,USA:FHWA,2005:12-26.
[4]JIN Xiao-qin,SHAO Xu-dong.Experience of innovative inte-gral bridges in China[C]//Proceedings of 7th InternationalConference on Short&Medium Span Bridgesin,Canada.Washington,DC:TRB,2006.
[5]金晓勤,邵旭东.半整体式全无缝桥梁研究[J].土木工程学报,2009,42(9):68-73.JIN Xiao-qin,SHAO Xu-dong.A study of fully jointlessbridge-approach system with semi-integral abutment[J].Chi-na Civil Engineering Journal,2009,42(9):68-73.(In Chi-nese)
[6]MARTIN P,BURKE J.Integral bridges[J].TransportationResearch Record,1990,1275:53-61.
[7]SOLTANI A A,KUKRETI A R.Performance evaluation ofintegral abutment bridges[J].Transportation Research Re-cord,1992,1371:17-25.
[8]WASSERMAN E P,WALKER J H.Integral abutments forsteel bridges[M].Tennessee:American Iron and Steel Insti-tute,1996.
[9]邵旭东,占雪芳.带地梁的新型半整体式无缝桥梁温度效应研究[J].中国公路学报,2010,23(1):43-48.SHAO Xu-dong,ZHAN Xue-fang.Temperature effect of in-novative semi-integral abutment jointless bridge with groundbeam[J].China Journal of Highway and Transport,2010,23(1):43-48.(In Chinese)
[10]马永春,邵旭东,梁才.全无缝桥梁接线路面拉伸力学特性理论和实验研究[J].地震工程与工程振动,2012,32(4):30-37.MA Yong-chun,SHAO Xu-dong,LIANG Cai.Theoreticaland experimental study on tension-deformation mechanicalproperties of continuously reinforced concrete approach pave-ment of FJSBs[J].Journal of Earthquake Engineering and En-gineering Vibration,2012,32(4):30-37.(In Chinese)
[11]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 Guidelines for seismic design of high-way bridges[S].Beijing:The China Communications Press,2008.(In Chinese)
[12]JT/T4-2004公路桥梁板式橡胶支座[S].北京:人民交通出版社,2004.JT/T 4-2004 Plate Type elastomeric pad bearings for high-way bridges[S].Beijing:The China Communications Press,2004.(In Chinese)
[13]JTG D63-2007公路桥涵地基与基础设计规范[S].北京:人民交通出版社,2007.JTG D63-2007 Code for design of ground base and founda-tion of highway bridges and culverts[S].Beijing:China Com-munication Press,2007.(In Chinese)
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