【摘要】：國(guó)內(nèi)外已發(fā)生的多次大地震中,橋梁結(jié)構(gòu)震害現(xiàn)象均十分普遍和嚴(yán)重,作為生命線工程的樞紐部分,橋梁震害不僅會(huì)造成巨大的直接經(jīng)濟(jì)損失,而且因其破壞導(dǎo)致的交通中斷會(huì)嚴(yán)重阻礙抗震救災(zāi)和災(zāi)后重建工作。因此,研究橋梁抗震性能指導(dǎo)橋梁抗震設(shè)計(jì)十分必要。梁式橋具有經(jīng)濟(jì)指標(biāo)高、施工周期短等優(yōu)點(diǎn),是橋梁建設(shè)中最常采用的橋型,同時(shí)也是地震中受損最嚴(yán)重的橋型。決定梁式橋抗震性能的關(guān)鍵構(gòu)件是橋墩,嚴(yán)重的墩柱震害是引起落梁、倒塌,并在震后難以修復(fù)使用的主要原因。因此,如何提高橋墩抗震性能是研究橋梁抗震的關(guān)鍵問(wèn)題之一。在不斷研究和創(chuàng)新的基礎(chǔ)上,大連理工大學(xué)邱文亮教授首次提出了鋼管混凝上核心柱組合橋墩,這種新型橋墩是將鋼管混凝土作為核心柱埋置于普通鋼筋混凝土橋墩內(nèi),使橋墩的抗震性能得以大幅提升。已有的工程實(shí)踐主要集中在將鋼管混凝土核心組合柱應(yīng)用于高層建筑領(lǐng)域,相關(guān)的研究成果側(cè)重于組合柱在靜態(tài)荷載作用下的軸壓性能方面。而橋梁結(jié)構(gòu)有著與前者截然不同的結(jié)構(gòu)體系、荷載類型和傳力機(jī)制,組合柱作為橋墩構(gòu)件必定有其不同的性能特點(diǎn),而相關(guān)的研究成果卻不多見(jiàn)。本論文的研究目的是深入地了解和把握鋼管混凝上核心柱組合橋墩的抗震性能,論文的主要工作及成果如下：(1)調(diào)研國(guó)內(nèi)外關(guān)于如何提高橋墩抗震性能的研究成果,并提出將鋼管混凝土核心柱應(yīng)用于普通橋墩以改善梁式橋的抗震性能；(2)進(jìn)行了組合墩柱七因素(軸壓比、配箍率、縱筋率、鋼管直徑和長(zhǎng)度、混凝上強(qiáng)度和剪跨比)擬靜力對(duì)比試驗(yàn),詳細(xì)描述了試驗(yàn)方案設(shè)計(jì)、試驗(yàn)過(guò)程及模型試件損傷發(fā)展情況；(3)對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行分析處理,評(píng)估上述各因素的變化對(duì)組合墩柱的延性、強(qiáng)度、耗能和殘余位移等抗震性能指標(biāo)的影響；(4)基于數(shù)值分析軟件OpenSees平臺(tái),建立纖維單元模型,對(duì)擬靜力試驗(yàn)過(guò)程進(jìn)行數(shù)值模擬,并將數(shù)值結(jié)果與試驗(yàn)數(shù)據(jù)對(duì)比分析；(5)通過(guò)對(duì)大量數(shù)據(jù)進(jìn)行回歸分析,提出了鋼管混凝土核心柱組合橋墩的等效屈服彎矩的實(shí)用計(jì)算公式,可為該類橋墩的抗震設(shè)計(jì)提供有益參考。
[Abstract]:In many large earthquakes at home and abroad, the earthquake damage of bridge structure is very common and serious. As a pivotal part of lifeline engineering, bridge earthquake damage will not only cause huge direct economic losses. Traffic disruptions caused by the damage could seriously hamper disaster relief and reconstruction efforts. Therefore, it is necessary to study the seismic performance of the bridge to guide the seismic design of the bridge. Beam bridge has the advantages of high economic index, short construction period and so on. It is the most commonly used bridge type in bridge construction, and it is also the most seriously damaged bridge type in earthquake. The key component to determine the seismic performance of beam bridges is the pier, and the severe damage to the pier column is the main reason for the fall and collapse of the beam, and it is difficult to repair and use after the earthquake. Therefore, how to improve the seismic performance of bridge piers is one of the key problems in bridge seismic research. On the basis of continuous research and innovation, Professor Qiu Wenliang of Dalian University of Science and Technology put forward for the first time a new type of concrete filled steel tube (CFST) bridge pier with concrete filled steel tube (CFST) as the core column in ordinary reinforced concrete (RC) pier. The seismic performance of piers can be greatly improved. The existing engineering practice mainly focuses on the application of CFST core composite columns in the field of high-rise buildings, and the related research results focus on the axial compression behavior of composite columns under static load. The bridge structure has different structure system, load type and force transfer mechanism. Composite column as a member of pier must have its different performance characteristics, but the related research results are rare. The purpose of this paper is to deeply understand and grasp the seismic behavior of composite piers with core columns on concrete-filled steel pipe. The main work and results are as follows: (1) the research results of how to improve the seismic performance of piers at home and abroad are investigated. The concrete filled steel tube core column is applied to the common pier to improve the seismic performance of the beam bridge. (2) Quasi-static comparative tests of seven factors (axial compression ratio, hoop ratio, longitudinal reinforcement ratio, diameter and length of steel tube, strength on coagulation and shear span ratio) of combined pier column are carried out, and the design of test scheme is described in detail. Test process and damage development of model specimen; (3) analyze and deal with the test data, and evaluate the influence of the above factors on the seismic performance of the composite pier column, such as ductility, strength, energy dissipation and residual displacement. (4) based on the numerical analysis software OpenSees, the fiber unit model is established, and the numerical simulation of the pseudo-static test process is carried out, and the numerical results are compared with the experimental data. (5) based on the regression analysis of a large number of data, a practical formula for calculating equivalent yield moment of concrete filled steel tube (CFST) core column composite pier is put forward, which can provide a useful reference for the seismic design of this kind of pier.
【學(xué)位授予單位】：大連理工大學(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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相關(guān)期刊論文 前2條

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本文編號(hào)：2382233