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《基于錨桿巖土體系統(tǒng)地震動(dòng)力響應(yīng)分析》由會(huì)員上傳分享,免費(fèi)在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫(kù)。
1、重慶大學(xué)碩士學(xué)位論文錨桿巖土體系統(tǒng)地震動(dòng)力響應(yīng)分析姓名:賈斌申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):巖土工程指導(dǎo)教師:陰可2010-04中文摘要摘要西南地區(qū)由于獨(dú)特的地理地形以及各種工程建設(shè)的需要,往往需要對(duì)很多高邊坡工程實(shí)施支護(hù)加固。錨桿支護(hù)結(jié)構(gòu)以其獨(dú)特優(yōu)越性在各行各業(yè)工程建設(shè)中得到廣泛應(yīng)用。尤其近年隨著西南地區(qū)交通建設(shè)的快速發(fā)展,錨桿支護(hù)結(jié)構(gòu)在公路鐵路高邊坡加固中取得了良好的錨固效果。但是5.12汶川地震也暴露出錨桿支護(hù)結(jié)構(gòu)在抗震設(shè)計(jì)上所存在的不足和問(wèn)題,大量的震害現(xiàn)象表明目前地震多發(fā)區(qū)或者強(qiáng)震區(qū)的錨桿支護(hù)結(jié)構(gòu)設(shè)計(jì)施工沒(méi)有充分考慮地震動(dòng)
2、力作用的影響。因此有必要對(duì)地震作用下錨桿支護(hù)結(jié)構(gòu)的地震響應(yīng)機(jī)理作相應(yīng)的分析和研究以對(duì)錨桿支護(hù)邊坡的抗震設(shè)防提供一定的參考和指導(dǎo)。本文研究過(guò)程主要由四個(gè)方面構(gòu)成:首先建立錨桿巖土體系統(tǒng)動(dòng)力分析模型,將地震時(shí)巖土體對(duì)于錨桿的作用簡(jiǎn)化為線彈簧和與速度相關(guān)的阻尼器,將面板對(duì)錨桿的慣性力簡(jiǎn)化為一個(gè)線性彈簧的作用加以分析。由此建立錨桿系統(tǒng)的諧振動(dòng)力平衡微分方程,并求解其在簡(jiǎn)諧動(dòng)力荷載作用下穩(wěn)態(tài)動(dòng)力響應(yīng)的解析解。其次通過(guò)大型有限元分析軟件ANSYS對(duì)此計(jì)算模型進(jìn)行了驗(yàn)證。然后,對(duì)錨桿巖土體系統(tǒng)進(jìn)行了參數(shù)影響分析,歸納了模型主要參數(shù)對(duì)錨桿巖
3、土體系統(tǒng)軸力峰值響應(yīng)的影響情況。最后結(jié)合理論分析和數(shù)值模擬結(jié)果對(duì)地震作用下錨桿支護(hù)邊坡失穩(wěn)破壞機(jī)理進(jìn)行了重新認(rèn)識(shí)。關(guān)鍵詞:錨桿,動(dòng)力模型,地震,動(dòng)力參數(shù),動(dòng)力響應(yīng)I英文摘要ABSTRACTDuetotheparticulargeographyandtherequirementofengineeringconstructionofsouthwestChina,weneedreinforcemanyhighslopeengineering.Thewidespreaduseofthesupportingstructurewitha
4、nchor-batinallkindsofprojectasaresultofitsuniqueadvantagements.Especially,nowadays,withtherapiddevelopmentoftrafficbuildingofsouthwestChina,thesupportingstructurewithanchor-batplayaimportantroleinhighslopedisposalofrailwayengineeringandhighwayengineering.ButinWench
5、uanearthquakethedefectsofanti-seismicmeasuresofthesupportingstructurewithanchor-bathadwereexposed.Alargenumberofearthquakedamagephenomenashowthedesignandbuildofthesupportingstructurewithanchor-batdidn’tconsidertheearthquakeactioncarefully.Consequently,relevantanaly
6、sisandresearchonseismicresponsemechanismofthesupportingstructurewithanchor-batarenecessaryforhighslopedisposal.Bymeansofthesemeasureswemayattainsomereferencesandguidancesforanti-seismicmeasuresofthesupportingstructurewithanchor-bat.Theresearchprocessofthisthesisare
7、madeupoffouraspects.Fristofall,adynamicanalysismodelofanchor-barandsurroundingrock-soilsystemisproposedinthepresentpaper.Theinteractionbetweenrock-soilandanchor-baristreatedaslinearspringanddampingsystemrelatedtovelocity.Theinertiaofthefacinguponanchor-barissimplif
8、iedasanlinearspringforanalysis.Adifferentialequationofvibrationunderhorizontalharmonicearthquakeareestablished,andtheanalyticalsolutionsareobtain