資源描述:
《橋梁抗震設(shè)計(jì)中幾個(gè)問題的研究(輸入地震動(dòng)·曲線橋地震反應(yīng)·梁橋隔震)》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。
1、西南交通太學(xué)博士學(xué)位論文摘要粱式橋譙橋梁工程中占絕大多數(shù),研究其地震反應(yīng)問題,具有藿大的經(jīng)濟(jì)意義髑社會(huì)慧義。本文根據(jù)漿式援地震反應(yīng)磺究現(xiàn)狀,從鰓決工程實(shí)臻閱鼷的角度出發(fā),主要進(jìn)行了下歹lj工作:l、針對(duì)當(dāng)前橋粱地震時(shí)程反應(yīng)分析中,只重視計(jì)算方法、計(jì)算模型豹研究,忽視輸入逢震動(dòng)靜情況,奉文研究了進(jìn)行融程分轎辯,確定輸入遺震動(dòng)酶原莉和方法。推襻了三種比較合理的方法來確定時(shí)程分析中所需的地震波。2、捂窶了蔫三麓綴數(shù)法合成入工逢震波對(duì),常戇合成方法譜掇合精廢不離的主袋原因。一般認(rèn)為,在反應(yīng)譜的中短周期段,譜擬合精度高。本文的研究表裴,這秘認(rèn)
2、識(shí)著不全囂。3、通過對(duì)場地地震反威的研究發(fā)現(xiàn),士呶麓動(dòng)強(qiáng)度不同,同樣的場地對(duì)地震動(dòng)的影魂也譽(yù)同。目前規(guī)范巾不同烈度下的設(shè)計(jì)反癍譜形狀一致,沒有考慮地震動(dòng)強(qiáng)弱對(duì)場地的影響。4、對(duì)振裂參與系數(shù)的概念進(jìn)行了推廣,研究了雙向水平地震動(dòng)的組合問題,討論了縫震波豹輸入主方囪,捂出了有關(guān)文獻(xiàn)中靜一些闖懲。5、計(jì)算比較了不同支承條件下,曲線橋自振周期、橋墩地震荷載等隨曲率半徑麓交純。討論了麓線掭零乎不霹方窩之蠲振動(dòng)懿藕合,捂密了鞠線耱撬震設(shè)計(jì)及計(jì)算時(shí)應(yīng)注意的問題。6、礤究了粱式耩豹橫囪地震反疲。發(fā)褒橫攜島蟋震夏應(yīng)籟按全揆摟型}}舞,國內(nèi)規(guī)范中的蓽墩
3、計(jì)算模型存在較大的誤差。7、首次分析了脯震支座延性率與隔震效果之間的關(guān)系,對(duì)隔震支座的設(shè)計(jì)參數(shù)進(jìn)行了研究,得掰了其食淫的取值范匿和選擇原潮。8、用多條具有棚同反應(yīng)譜、且時(shí)域內(nèi)強(qiáng)度包線形狀相似的地震波,對(duì)隔震耩粱避行了大藿菲線僚辯程葳應(yīng)努孝蓐,發(fā)現(xiàn)繇線毪繚禱箍震愛應(yīng)載離散性禳大,其最大響應(yīng)對(duì)地震動(dòng)的全過程十分敏感。9、黠溪麓援粱設(shè)詩射露瘸鶼5秘等效線爛純方浚避露了斃較磷爨,發(fā)瑤簇反應(yīng)譜法按等效線性模型計(jì)算時(shí),如果隔震贏座延性率不同,計(jì)算結(jié)果的安全概率巍不一櫸。關(guān)鍵測:結(jié)構(gòu)工程,橋梁,抗震,騙震,輸入地震動(dòng),曲線橋。墮墮壅望查堂墮主蘭魚
4、墮奎ResearchonCertainproblemsintheSeismiCDesignofBridges(InputGroundMotion‘CurvedBridgesSeismicResponse·GirderBridgesSeismicIsolation)AbstractThemajorityofbridgesareofthegirdertype.TheseismicresponsestudyofsuchbridgesisofgreateconomicandsocialsignificanceAccordingtothein
5、vestigationonthestate-of-the·artofgirderbridgeseismicresponse,andwiththeaimofsolvingpracticalengineeringproblems,thefollowingitemsofresearchworkhavebeendone:1.Sofarinbridgeseismicanalysis,muchattentionhasbeenpaidtothecalculatingmethodsandanalysismodels,butlittleattenti
6、ontothegroundmotionTheprinciplesofdetermininggroundmotionintimehistoryanalysishavebeenstudiedbytheauthor.Threereasonablemethodsaresuggestedfordeterminingearthquakegroundmotionintimehistoryanalysis.2Themaincausesoflowspectrum-compatibleprecisioninconventionalmethodsgene
7、ratingartificialgroundmotionwithtrigonometricfunctionshavebeenfound.Thestudyprovesthatthegeneralopinionthatspectrum·compatibleprecisionishighforshortperiodsisnotcorrec't3.Throu曲analysingsiteearthquakeresponses,ithas·beenfoundthattheinfluenceofthesamesiteongroundmotionm
8、ayvaryastheintensityofgroundmotionchanges.Incurrentstandards,thedesignresponsespectraarethesameunderdifferentintensit