本文選題：基底隔震　切入點：橋墩　出處：《蘭州交通大學》2015年碩士論文　論文類型：學位論文

【摘要】：本文采用振動臺模型試驗與有限元數(shù)值模擬相結合的方法,研究了三種基底搖擺隔震橋墩的地震反應。通過振動臺試驗結果和有限元數(shù)值模擬結果的對比分析,總結出三種基底隔震橋墩地震反應的變化規(guī)律,并驗證已有數(shù)值計算模型的正確性,對基底隔震技術在橋梁抗震應用中的推廣具有積極的現(xiàn)實意義。本文主要研究內容如下:(1)從理論研究、振動臺試驗和工程實際應用三個方面介紹了基底隔震技術的國內外研究現(xiàn)狀,闡述了各國規(guī)范中基底隔震橋墩的設計和計算方法,并對典型減隔震裝置的力學性能和常用橋梁減隔震的分析方法做了總結。(2)在研究了模型結構動力試驗相似原理的基礎上,以設計時速160km/h的客貨共線24m簡支T梁橋矩形橋墩為原型,設計制作了三組動力相似比為1:40的基底搖擺隔震橋墩模型,分別代表自由搖擺基底隔震橋墩、沿墩底兩側加臺設置限位鋼筋和沿墩柱中心設置預應力防傾覆鋼筋的基底搖擺隔震橋墩。(3)通過振動臺模型試驗,分別測試三種模型在不同峰值加速度、不同類型地震波和不同軸壓比作用下的加速度、位移和應力反應,并對數(shù)據(jù)結果進行了對比分析。(4)通過對三種模型地震反應的數(shù)據(jù)進行對比分析,研究了地震波峰值加速度、地震波類型和軸壓比對三種基底隔震橋墩地震反應的影響。通過三種模型的比較,研究了限位耗能裝置對模型橋墩搖擺反應和耗能機制的影響。在總結基底隔震橋墩地震反應變化規(guī)律的基礎上,評價了三種結構抗震性能的優(yōu)缺點。(5)采用考慮提離效應、碰撞效應、預應力效應和限位效應的基底搖擺隔震橋墩數(shù)值計算模型模擬了三種模型的地震反應。并將振動臺試驗結果與有限元數(shù)值模擬結果進行了對比分析,結果表明數(shù)值計算模型可很好地模擬基底搖擺隔震橋墩的地震反應,且模型地震反應變化規(guī)律與試驗實測值變化規(guī)律一致,驗證了數(shù)值計算模型的正確性。
[Abstract]:In this paper, the seismic response of three base rocking isolated bridge piers is studied by using the method of shaking table model test and finite element numerical simulation. The results of shaking table test and finite element numerical simulation are compared and analyzed. The variation laws of seismic response of three kinds of base-isolated bridge piers are summarized, and the correctness of the existing numerical calculation models is verified. It has positive practical significance for the application of base isolation technology in the application of earthquake resistance of bridges. The main contents of this paper are as follows: 1) from the theoretical perspective, This paper introduces the research status of base isolation technology in China and abroad from three aspects of shaking table test and practical application of engineering, and expounds the design and calculation methods of base isolation bridge pier in national codes. The mechanical properties of typical isolation devices and the analysis methods of common bridge isolation are summarized. Based on the study of the similarity principle of dynamic test of model structures, Based on the rectangular pier of a passenger / freight common-line 24m simply supported T-beam bridge designed at 160 km / h per hour, three sets of base rocking isolated pier models with a dynamic similarity ratio of 1:40 are designed and manufactured, respectively, representing the free rocking base isolation pier. The foundation rocking isolated bridge piers with limited reinforcement along both sides of pier bottom and prestressed anti-overturning steel bar set along the center of pier column are tested by shaking table model test, and the three models with different peak accelerations are tested respectively. The acceleration, displacement and stress responses of different types of seismic waves and different axial compression ratios are compared and analyzed. The peak acceleration of seismic waves is studied by comparing and analyzing the seismic response data of three kinds of models. Effects of seismic wave types and axial pressure ratios on seismic responses of three base-isolated piers. The influence of limited energy dissipation device on the rocking response and energy dissipation mechanism of model pier is studied. Based on the conclusion of the variation law of seismic response of base isolated bridge pier, the advantages and disadvantages of seismic performance of three kinds of structures are evaluated. The seismic responses of three kinds of models are simulated by the numerical calculation model of base rocking isolated bridge pier with impact effect, prestress effect and limit effect, and the results of shaking table test and finite element numerical simulation are compared and analyzed. The results show that the numerical model can well simulate the seismic response of the rocking isolated bridge pier, and the variation law of the model seismic response is consistent with the experimental measured value, which verifies the correctness of the numerical calculation model.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U446;U443.22

【共引文獻】

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1 Angelo Di Egidio;Daniele Zulli;Alessandro Contento;;Comparison between the seismic response of 2D and 3D models of rigid blocks[J];Earthquake Engineering and Engineering Vibration;2014年01期

2 李冰;王少華;鄧斌;;摩擦擺支座在高速鐵路橋梁中的隔震性能研究[J];機械科學與技術;2015年03期

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1 趙志飛;客運專線上LRB隔震簡支梁橋縱向抗震設計方法研究[D];石家莊鐵道大學;2014年

2 方孟然;鋼筋混凝土空心高墩延性抗震研究及優(yōu)化[D];青島理工大學;2014年

3 呂飛;多跨連續(xù)梁橋LRB與FVD組合應用減隔震效果分析[D];中南大學;2014年

4 田智元;勁性骨架鋼管混凝土拱橋的抗震性能分析與減震控制研究[D];蘭州交通大學;2014年

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本文編號：1626011