資源描述：
《基于場(chǎng)地效應(yīng)的山區(qū)高墩橋梁隨機(jī)地震響應(yīng)分析.pdf》由會(huì)員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在行業(yè)資料-天天文庫(kù)。
1、第29卷第6期公路交通科技v01．29No．62012年6月JournalofHighwayandTransportationResearchandDevelopmentJun．2012d硝：10．3969／j．issn．1002-0268．2012．06．016基于場(chǎng)地效應(yīng)的山區(qū)高墩橋梁隨機(jī)地震響應(yīng)分析賈宏宇，鄭史雄(西南交通大學(xué)土木工程學(xué)院，四川成都610031)摘要：為研究場(chǎng)地效應(yīng)對(duì)高墩橋粱隨機(jī)地震響應(yīng)的影響規(guī)律，基于隨機(jī)振動(dòng)理論，研究了不同墩高和墩高差時(shí)場(chǎng)地效應(yīng)對(duì)山區(qū)高墩橋梁在強(qiáng)地震作用下多點(diǎn)激勵(lì)隨機(jī)響應(yīng)規(guī)律。對(duì)基于ANSY
2、S的隨機(jī)振動(dòng)計(jì)算理論進(jìn)行推導(dǎo)并建立三維數(shù)值有限元模型。對(duì)不同墩高和墩高差的山區(qū)高墩橋粱進(jìn)行不同場(chǎng)地條件下的多點(diǎn)激勵(lì)隨機(jī)地震分析。研究表明：場(chǎng)地效應(yīng)對(duì)高墩橋粱地震響應(yīng)影響顯著。軟場(chǎng)地條件下，橋墩位移和主粱軸力均較硬、中場(chǎng)地時(shí)大；隨著墩高的增加，硬、中、軟場(chǎng)地效應(yīng)對(duì)主梁軸力影響先增大后減·1、；隨著墩高差的增加，主粱軸力變化規(guī)律性不強(qiáng)，成波動(dòng)性變化；主梁橫橋向彎矩對(duì)場(chǎng)地效應(yīng)敏感，軟場(chǎng)地時(shí)響應(yīng)是硬、中場(chǎng)地時(shí)的5一12倍，靠近高墩處的邊跨反應(yīng)比矮墩處邊跨明顯；隨著墩高差的增加，軟場(chǎng)地對(duì)主梁彎矩響應(yīng)放大作用也隨之增加。關(guān)鍵詞：橋梁工程；高墩橋
3、粱；場(chǎng)地效應(yīng)；隨機(jī)振動(dòng)；多點(diǎn)激勵(lì)；強(qiáng)地震中圖分類(lèi)號(hào)：U442．5+5文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-0268(2012)06—0093一05AnalysisofRandomSeismicResponseofHigh-risePierBridgeinMountainAreaBasedonSiteEffectJIAHongyu，ZHENGShixiong(SchoolofCivilEngineering，SouthwestJiaotongUniversity，ChengduSiehuan610031，China)Abstract：In
4、ordertoinvestigatetheseismicresponseofhigh—risepierbridgeduetositeeffect，basedonFandomvibrationtheory，randomresponseofhish-risepierbridgeinmountainareasubjectedtomulti—pointexcitationofstrongearthquakecausedbylocalsiteeffectwithdifferentpierheights(PH)andheightdifferen
5、cesbetweenhighpierandlowpier(HDHL)Wasresearched．TheformulaofANSYSbasedrandomvibrationtheorywasderivedandthe3DfiniteelementmodelWasestablished．Suchrandomresponsesubjectedtomulti．pointexcitationunderdifferentcasecalculations，different10ealsiteeffects，anddifferentPHsandHD
6、HLs，wereconductedindetail．Theresultshowsthat(1)seismicresponseofhig}l-risepierbridgeWaSaffectedsignificantlybylocalsiteeffects，undersoftgroundcondition，thepierdisplacementandthemainbeamaxialforcewerelargerthanthoseunderothergroundconditions；(2)mainbeamaxialforcerespons
7、esfirstincreasedandthendecreasedwiththeheightincreaseofpiersinhard，mediumandsoftgroundeffect；(3)mainbeamaxialforceresponseroleswerenotclearwithHDHLincrease，onlyfluctuated；(4)lateralmomentofmainbeamWassensitivetolocalsiteeffect．theresponseundersoftgroundconditionWagthe5
8、—12timeslargerthanthatunderhard，mediumgroundconditions，theseismicresponseofsidespannearhiighpierWasstrongerthanthatof
