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时间:2020-03-27
《大跨度连续梁桥的减隔震和延性抗震分析.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第28卷第8期公路交通科技V01.28No.82011年8月JournalofHighwayandTransportationResearchandDevelopmentAug.2011doi:10.3969/j.issn.1002—0268.2011.08.014大跨度连续梁桥的减隔震和延性抗震分析杨亮,肖杰,王文欣,杨立坡(天津市市政工程设计研究院,天津300051)摘要:采用加强固定盆式支座和墩柱强度的方法来强行保证大跨度连续梁桥在强震作用下的结构安全,固定墩会承受较大的地震力,由此导致设计的不经济性。针对上述现象。采用弹塑
2、性减震耗能装置方案对强震区大跨连续梁桥进行减隔震设计。计算表明,通过合理设置装置的屈服力以及后屈曲刚度比,弹塑性减震耗能装置可以起到明显减小固定墩所受地震力、提高结构抗震性能的效果。对墩柱进行延性抗震设计,并分析比较不同因素对结构延性的影响。结果表明,考虑墩柱的延性可以有效降低墩柱底部弯矩。配箍率和轴压比对墩柱的延性系数影响较明显,而纵向主筋的配筋率减低,屈服和极限曲率均会降低,对延性系数的影响较小。关键词:桥梁工程;大跨度连续梁桥;减隔震设计;延性抗震设计;非线性时程分析中图分类号:U425+5文献标识码:A文章编号:1002—
3、0268(2011)08—0073—06AnalysisofSeismicIsolationandDuctilityforLong-spanContinuousBridgesYANGHang,XIAOJie,WANGWenxin,YANG“p0(Ti删inMunicipalEngineeringDesignandResearchInstitute,Tianjin300051,China)Abstract:Ifthefixedpotbeatingandpieroflong-spancontinuousbridgearereinfor
4、cedtoensurethestructuresafetyunderstrongearthquake,thebridgepierwillsufferfromlargerseismicload,thusresultinuneconomicaldesign.Aimedattheabove-mentionedproblem,theelasticl—plasticisolationandenergydissipationdeviceWaSproposedtodotheseismicisolationdesignonthelong-span
5、continuousgirderbridgeinstrongearthquakeal'ea.Thecalculationshowsthatbysettingparametersaboutyieldforceandpost-yieldingstiffnessratio,theelastic—plasticisolationandenergydissipationdevicecansignificantlyreduceseismicforceexertedonthefixedpierandimprovetheseismicperfor
6、manceofthebridgestructure.Aductility·basedseismicdesignofthepiersWaSthenconducted,.andaparametricstudywasimplementedtoanalyzeandcomparetheeffectfactoroftheductility.Theresultsshowthat(1)thebendingmomentonthebottomoffixedpiercanbegreatlydecreasedbyconsideringitsductili
7、ty;(2)stirrupratioandaxialcompressionratiohavelargeinfluenceonductilecoefficient;(3)cross-sectionyieldandultimatecurvaturesdecrease∞longitudinalreinforcementratiodecreaSes,andtheimpactoflongitudinalreinforcementratioonductilityissmalLKeywords:bridgeengineering;long-sp
8、ancontinuousbridge;seismicisolationdesign;seismicductilitydesign;nonlineartimehistoryanalysiso引言车了霹薹霎三茹鬈嚣黑篇筹拳麓薹现行公路抗震细则⋯要求跨径
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