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1、第44卷第1期土木工程學(xué)報(bào)Vol.44No.12011年1月CHINACIVILENGINEERINGJOURNALJan.2011動(dòng)水壓力作用對(duì)深水橋墩地震響應(yīng)的影響1,21,2黃信李忠獻(xiàn)(1.天津大學(xué),天津300072;2.濱海土木工程結(jié)構(gòu)與安全教育部重點(diǎn)實(shí)驗(yàn)室,天津300072)摘要:地震激勵(lì)下水與橋墩的相互作用會(huì)對(duì)橋墩產(chǎn)生動(dòng)水壓力,本文研究動(dòng)水壓力作用對(duì)深水橋墩地震響應(yīng)的影響,對(duì)提高深水橋墩長大橋梁的抗震安全性尤為重要。分別采用Morison方程和輻射波浪理論,建立了動(dòng)水壓力計(jì)算方法,分析了動(dòng)水壓力作用對(duì)橋墩地震
2、響應(yīng)的影響,并比較了兩種方法計(jì)算的動(dòng)水壓力對(duì)橋墩地震響應(yīng)影響的差異;分析了考慮土2結(jié)構(gòu)相互作用時(shí)以及雙向地震作用下動(dòng)水壓力作用對(duì)樁基橋墩地震響應(yīng)的影響。研究表明:動(dòng)水壓力作用不僅會(huì)改變橋墩的動(dòng)力特性,而且會(huì)增大橋墩的地震響應(yīng),其影響隨相對(duì)水深的增大而增強(qiáng);當(dāng)橋墩迎水面寬度較大時(shí),采用Morison方程計(jì)算的動(dòng)水壓力對(duì)橋墩地震響應(yīng)的影響明顯大于采用輻射波浪理論計(jì)算動(dòng)水壓力的影響;考慮土2結(jié)構(gòu)相互作用會(huì)降低動(dòng)水壓力對(duì)橋墩地震響應(yīng)的影響,但其影響仍不容忽視;考慮雙向地震作用會(huì)加劇動(dòng)水壓力對(duì)橋墩地震響應(yīng)的影響。由此得出結(jié)論,在深
3、水橋墩長大橋梁的抗震分析中,需考慮動(dòng)水壓力作用對(duì)橋墩地震響應(yīng)的影響。關(guān)鍵詞:深水橋墩;地震響應(yīng);動(dòng)水壓力;Morison方程;輻射波浪理論;土2結(jié)構(gòu)相互作用;雙向地震作用中圖分類號(hào):U443.22文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):10002131X(2011)0120065209Influenceofhydrodynamicpressureonseismicresponseofbridgepiersindeepwater1,21,2HuangXinLiZhongxian(1.TianjinUniversity,Tianjin300
4、072,China;2.KeyLaboratoryofCoastCivilStructureSafety,MinistryofEducation,Tianjin300072,China)Abstract:Hydrodynamicpressureonbridgepierswouldoccurduringwater2pierinteractionunderearthquakes.Theinfluenceofhydrodynamicpressureontheseismicresponseofbridgepiersisstudi
5、ed.HydrodynamicpressureformulaisestablishedusingboththeMorisonequationmethodandtheradiationwavetheory.Theinfluenceofhydrodynamicpressureontheseismicresponseofbridgepiersisstudiedandthetwomethodsarecompared.Theinfluenceofhydrodynamicpressureontheseismicresponseofa
6、pierwithpilefoundationisanalyzedwithconsiderationofsoil2structureinteractionandbidirectionalearthquakeaction.Theresultsindicatethatthedynamiccharacteristicsofpierchangedandtheseismicresponseisaugmentedbecauseofthehydrodynamicpressureeffect,andthiseffectbecomesmor
7、esignificantwiththeincreaseoftherelativewaterdepth.Forpierswithwiderupstreamface,theinfluenceofhydrodynamicpressurefromtheMorisonequationisobviouslylargerthanthatfromtheradiationwavetheory.Theactionofhydrodynamicpressuredecreasesifthesoil2structureinteractionisco
8、nsidered,buttheinfluenceofhydrodynamicpressurecannotbeignored.Theinfluenceofhydrodynamicpressurewillbeenhancedunderbidirectionalearthquakeaction.Inconclusion,t
