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《液化場(chǎng)地樁－土－橋梁結(jié)構(gòu)地震相互作用振動(dòng)臺(tái)試驗(yàn)數(shù)值模擬方法研究》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。
1、液化場(chǎng)地樁－土－橋梁結(jié)構(gòu)地震相互作用振動(dòng)臺(tái)試驗(yàn)數(shù)值模擬方法研究摘要：直接針對(duì)大型振動(dòng)臺(tái)模型試驗(yàn)，建立液化場(chǎng)地樁－土－橋梁結(jié)構(gòu)地震相互作用數(shù)值模擬的二維分析模型和計(jì)算方法。根據(jù)樁基平面應(yīng)變假定，將空間樁體轉(zhuǎn)換成平面板樁，并考慮樁的尺寸效應(yīng)；基于樁截面節(jié)點(diǎn)位移協(xié)調(diào)條件和平衡力系等效原理，建立四結(jié)點(diǎn)梁?jiǎn)卧獎(jiǎng)偠染仃嚽覍?duì)Timoshenko梁桿單元?jiǎng)偠染仃囘M(jìn)行增廣修正，以考慮樁的橫向尺寸影響樁周土位移場(chǎng)分布的尺寸效應(yīng)。根據(jù)有效應(yīng)力原理進(jìn)行土動(dòng)反應(yīng)分析，采用滿足Masing準(zhǔn)則的修正雙曲線模型描述土動(dòng)力變形的本構(gòu)關(guān)系，同時(shí)考慮因孔壓上升造成土體軟化而對(duì)土動(dòng)力性能的影響，由迭代法
2、處理土的動(dòng)力非線性。采用并聯(lián)彈簧－阻尼器模擬計(jì)算域人工邊界，以考慮邊界波的反射作用對(duì)體系動(dòng)力反應(yīng)的干擾和土粘滯阻尼的影響。采用逐步積分法計(jì)算體系的地震反應(yīng)。通過與試驗(yàn)結(jié)果的對(duì)比分析，評(píng)估數(shù)值模擬的建模途徑和計(jì)算方法的可靠性。關(guān)鍵詞：大型振動(dòng)臺(tái)模型試驗(yàn)；數(shù)值模擬；樁－土－橋梁結(jié)構(gòu)地震相互作用；液化場(chǎng)地。中圖分類號(hào)：U442.55文獻(xiàn)標(biāo)識(shí)碼：ANumericalSimulationMethodofShakingTableTestonEarthquakeIntractionofPile-Soil-BridgeStructureinLiquefactionSiteAbstr
3、act:Directlyaimingatlarge-scaleshakingtablemodeltest,thepaperwillestablishtwo-dimensionanalysismodelandnumerationmethodonnumericalsimulationmethodofearthquakeinteractionofpile-soil-bridgestructureinliquefactionsite.Basedontheassumptionofplanestrainofpilefoundationandconsideringscaleeff
4、ectofpile,specialpilebodiesaretransformedintoplanesheetpile.Accordingtothedisplacementharmonyconditionofpilesectionnodeandtheequivalentprincipleofforcesystem,theanalysismodelwillsetupfourcrunodeselementstiffnessmatrixofbeamcellandamendTimoshenkobeam-polestiffnessmatrixincreasinglyinord
5、ertoconsiderthedisplacementfielddistributionofsoilnearbythepileasaresultofdimensioneffectofpilelandscapeorientation.Dependonsoildynamicresponsebyeffectivestresstheory,theamendatoryhyperbolicmodelwhichaccordswithMasingruleisadoptedtodescribeconstitutiverelationofsoildynamicdeformationan
6、dtheeffectforsoilinteneratingcausedbyriseofporewaterpressureonsoildynamicperformanceistakenintoaccountthroughiterationmethodtodealwiththeproblemofsoilnonlinearmomentum.Parallelspring-counterbuffermodelisusedtosimulateartificialboundaryinthecomputationregiontoconsidertheeffectwhichderiv
7、edfromreflectionofboundarywaveontheinterferenceofsystemdynamicreactionandviscousdampingofsoilandthesuccessiveintegralmethodisintroducedintoseismicresponseofthecalculationsystem.Comparedwiththeresultfromthetest,thecalculationmethodandthepathofmodelbuildingfornumericalvaluesimulationar
