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1、湖南大學(xué)碩士學(xué)位論文鋼筋混凝土梁的動(dòng)力損傷診斷研究姓名:劉玉明申請(qǐng)學(xué)位級(jí)別:碩士專業(yè):結(jié)構(gòu)工程指導(dǎo)教師:易偉建19990601P3186{l鋼筋混凝土梁的動(dòng)力損傷診斷研究?jī)?nèi)容提要本文對(duì)八根鋼筋混凝土粱的動(dòng)力損傷診斷問題進(jìn)行了研究,主要內(nèi)容包括:(1)對(duì)八根鋼筋混凝±粱迸行了靜力和振動(dòng)兩個(gè)方面的試驗(yàn),由靜力試驗(yàn)獲取了結(jié)構(gòu)損傷前后的靜力特性,由振動(dòng)試驗(yàn)獲取了結(jié)構(gòu)損傷前后的動(dòng)力特性,從而構(gòu)成損傷診斷的試驗(yàn)依據(jù)。(2)通過對(duì)振動(dòng)測(cè)試結(jié)果的分析,本文首先提出了兩端帶剛臂梁并考慮邊界條件的計(jì)算動(dòng)力模型;然后進(jìn)行計(jì)算動(dòng)力模型的特征值靈敏度分析:最后采用等式約束條件
2、下的優(yōu)化方法,根據(jù)粱在完好狀態(tài)下的動(dòng)力特性,對(duì)梁的初始計(jì)算動(dòng)力模型進(jìn)行修正和邊界條件識(shí)別,再采用等式約束和不等式約束條件下的優(yōu)化方法,對(duì)梁進(jìn)行損傷識(shí)別。荊用本文方法進(jìn)行損傷識(shí)別的優(yōu)點(diǎn)是只利用實(shí)鋇4頻率,不利用實(shí)測(cè)振型:、、—廠o(3)在鋼筋混凝土梁的動(dòng)力損傷診斷研究中,本文結(jié)合梁的動(dòng)力特性和靜力特性兩方面的數(shù)據(jù).首先建立了以靜力剛度致?lián)榛A(chǔ)的梁的動(dòng)力剛度統(tǒng)計(jì)公式:然后根據(jù)粱的靜力剛度損傷系數(shù)、動(dòng)力剛度損傷系數(shù)、固有頻率降低系數(shù)三項(xiàng)指標(biāo)對(duì)梁的損傷程度進(jìn)行了定性的評(píng)估D限后本文提出了評(píng)估結(jié)構(gòu)承載力的方法。并對(duì)八根試驗(yàn)梁的承載力進(jìn)行了評(píng)估,得到了較為滿意
3、的結(jié)果。.r一。\1關(guān)鍵詞動(dòng)力特性靜力特性損傷診斷特征值靈敏度分折承載力岡《度DynamicDamageDetectionofReinforcedConcreteBeamsAbstractResearchesondynamicdamagedetectionofreinforcedconcretebeamsarepresentedinthispaper.Themaincontentsconsistof.-(1)TbestaticandvibrationtestsofeightreinforcedCOncretebeamshavebeendoneinth
4、ispaper.Thestaticcharacteristicsofbeamsbeforeandafterthedamagehavebeenobtainedinstatictests,whilethedynamicchamcteristicsofbean3sbeforeandafterthedamagehavebeenobtainedinvibrationtests,andtheselaytheexperimentalfoundationfordynamicdamagedetectionofreinfofcedconcretebeams.(2)Bas
5、edonthestudyofthedynamicdata,thecomputationaldynamicmodelofbeamwithrigidarmsatbothends,inwhichboundariescomprisemas鞴sandspfirigs,isfirstdevelopedinthispaper.ThfoamethodwhichadoptseigenvalnesensitivityanalysisofthecomputationaldynamicmodelandoptimalitycriterionisintmI:lucedtoref
6、inetheoriginalmodelandidentifytheboundariesanddamage,usingthetestedfrequenciesofundamagedanddamagedhP..Jlmsonly,f3)IntheCOUPeofdamagedetectionofreinforcedconcretebe鯽眵,thestatisticalformulaofdynamicstiffnessbasedonthestaticstiffnessisfirstdevelopedinthe陽(yáng)per,usingbothstatic-chara
7、cteristicsanddynamic-characteristicsdata。Thenaqualitativeass螂mentoftheseverityofthedamagetothetestedbeamsi5obtained,usingthestatic-stiffnessdamagefactorandthedynamic-stiffnessdamagefactorendnaturalfrequenciesdescentfactor.拼nally·itmethodcapableofassessingtheI餅Id-ca叫鴨capacityisp
8、roposedandsatisfactoryresultsareachievedfromthetoad-ca