發(fā)布時(shí)間：2018-05-10 06:11

  本文選題：自復(fù)位 + 搖擺隔震�。� 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：自復(fù)位隔震橋墩在墩底和基礎(chǔ)的接觸面處分離,在罕遇地震下,可以發(fā)生搖擺,隔離了部分地震能量的傳遞,起到保護(hù)橋墩和基礎(chǔ)的作用,震后依靠自重進(jìn)行自復(fù)位。目前預(yù)應(yīng)力技術(shù)在自復(fù)位隔震橋墩中還鮮有研究。本文采用數(shù)值分析方法,研究了配豎向預(yù)應(yīng)力鋼筋自復(fù)位隔震橋墩的抗震性能,主要研究?jī)?nèi)容如下:(1)通過查閱文獻(xiàn)資料,總結(jié)了自復(fù)位搖擺結(jié)構(gòu)的發(fā)展與應(yīng)用及其國(guó)內(nèi)外研究現(xiàn)狀。(2)介紹了減隔震的基本原理以及減隔震結(jié)構(gòu)地震反應(yīng)的分析方法。(3)介紹了自復(fù)位隔震橋墩的幾種分析模型,在兩彈簧模型的基礎(chǔ)上,提出了配豎向預(yù)應(yīng)力鋼筋的自復(fù)位隔震橋墩模型。(4)以某新建鐵路特大橋?yàn)楸尘?建立單墩分析模型,采用非線性時(shí)程分析法,研究了兩彈簧模型和豎向配預(yù)應(yīng)力鋼筋模型在有、無預(yù)應(yīng)力的三種情況下的地震反應(yīng)并進(jìn)行了對(duì)比,結(jié)果表明,在原有結(jié)構(gòu)上施加了預(yù)應(yīng)力后,自復(fù)位震橋墩的抗震性能有明顯改善。(5)研究了影響橋墩隔震性能的預(yù)應(yīng)力因素,通過改變這些因素,進(jìn)行了參數(shù)比對(duì)分析,結(jié)果表明,預(yù)應(yīng)力的大小對(duì)橋墩地震反應(yīng)的影響較大,適當(dāng)大小的預(yù)應(yīng)力能較好地改善自復(fù)位隔震橋墩的抗震性能,預(yù)應(yīng)力作用位置對(duì)墩頂最大水平位移影響較大。
[Abstract]:The self-reset isolated bridge pier is separated from the contact plane between the pier bottom and the foundation. Under rare earthquake, it can swing, isolate part of the seismic energy transfer, play the role of protecting the bridge pier and foundation, and rely on self-reposition by self-weight after the earthquake. At present, the technique of prestress is seldom studied in self-reset isolated pier. In this paper, the seismic behavior of self-reset isolated pier of vertical prestressed steel bar is studied by numerical analysis method. The main research contents are as follows: 1) by consulting the literature, This paper summarizes the development and application of self-reset rocking structure and its research status at home and abroad. It introduces the basic principle of seismic isolation and the analysis method of seismic response of isolation structure. It introduces several analytical models of self-reset isolated pier. On the basis of two spring models, a self-reset isolated pier model with vertical prestressing bar is proposed. Based on a newly built railway bridge, a single pier analysis model is established, and a nonlinear time-history analysis method is used. The seismic responses of the two spring model and the vertical prestressed steel bar model are studied and compared in three cases with or without prestress. The results show that the prestressing force is applied to the original structure. The seismic behavior of self-reset pier is improved obviously. (5) the prestressing factors that affect the seismic isolation performance of bridge pier are studied. By changing these factors, the parameters are compared and analyzed. The results show that, The magnitude of prestress has a great influence on the seismic response of pier, the proper size of prestress can improve the seismic performance of self-reset isolated pier, and the position of prestress has a great influence on the maximum horizontal displacement of pier top.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55

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本文編號(hào)：1868135