發(fā)布時(shí)間：2018-03-10 04:05

  本文選題：索鋼轉(zhuǎn)換節(jié)點(diǎn)　切入點(diǎn)：摩擦磨損　出處：《北京交通大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：在預(yù)應(yīng)力張拉結(jié)構(gòu)中,節(jié)點(diǎn)是連接結(jié)構(gòu)各構(gòu)件的關(guān)鍵部分。確保節(jié)點(diǎn)擁有良好的工作性能,才能保證預(yù)應(yīng)力鋼索與主體鋼結(jié)構(gòu)之間能夠協(xié)同受力,索鋼形成的結(jié)構(gòu)體系具有一定的承載能力和穩(wěn)定性。因而在工程實(shí)踐領(lǐng)域,對(duì)預(yù)應(yīng)力鋼索與鋼結(jié)構(gòu)的連接節(jié)點(diǎn)開展相關(guān)力學(xué)性能的研究顯得尤為重要。本文就索鋼轉(zhuǎn)換(連接)節(jié)點(diǎn)處,鋼絞線鋼索與連接件—鋼索夾之間的摩擦磨損、接觸擠壓等問題進(jìn)行深入地分析和探討。 本文的主要研究?jī)?nèi)容包括： 1.通過索鋼轉(zhuǎn)換節(jié)點(diǎn)的鋼結(jié)構(gòu)模型往復(fù)加載試驗(yàn),研究了鋼索與連接件之間在相對(duì)的摩擦滑移、不同的加載應(yīng)力比以及不同接觸材質(zhì)條件下,表層索絲、Galfan鍍層和連接件的損傷情況,以及鋼索張拉力和摩擦力的變化規(guī)律； 2.通過索鋼轉(zhuǎn)換節(jié)點(diǎn)的有限元模型分析,研究了鋼索與連接件之間在不同的接觸條件下,表層索絲的應(yīng)力分布,并通過應(yīng)力放大系數(shù)ξ的取值大小,反映出不同的索鋼接觸條件下表層索絲損傷程度的差異。 本文相關(guān)的研究結(jié)論如下： 1.若鋼索處于在高張拉應(yīng)力狀態(tài)下,并與連接件之間存在往復(fù)的摩擦滑移,鋼索表面的鍍層會(huì)極易開裂,裂紋迅速地?cái)U(kuò)展匯聚并最終導(dǎo)致鍍層的塊狀脫落,隨后索絲鋼基體表面暴露出來,索絲表面的損傷程度會(huì)明顯加重； 2.向鋼索與索夾接觸面間加入不同的接觸介質(zhì),可以得到往復(fù)加載后轉(zhuǎn)換節(jié)點(diǎn)處鋼索表層鋼絲的損傷程度大小依次是：索孔內(nèi)壁鍍鋅鋁合金索鋼直接接觸加普通橡膠墊層加薄鋁片墊層加耐磨橡膠墊層； 3.在往復(fù)加載過程中,鋼索張拉力呈現(xiàn)出逐漸減小的變化趨勢(shì),張拉力損失在加載初期比較平穩(wěn),在加載中期,有一個(gè)穩(wěn)定的增長(zhǎng)的過程,在加載后期又趨于穩(wěn)定,而鋼索的摩擦力在整個(gè)加載過程中變化都比較平穩(wěn)； 4.索鋼接觸處鋼索表層索絲、Galfan鍍層的損傷程度可與應(yīng)力放大系數(shù)ξ建立對(duì)應(yīng)關(guān)系。針對(duì)于索鋼之間不同的接觸條件,應(yīng)力放大系數(shù)在1.10～1.25的范圍內(nèi)變化,在此范圍內(nèi)表層索絲的損傷程度變化幅度較大,而Galfan鍍層損傷程度變化較為平穩(wěn)。
[Abstract]:In the prestressed tensioning structure, the joint is the key part of the members of the connecting structure. To ensure that the joint has good working performance, the cooperative force between the prestressed steel cable and the main steel structure can be guaranteed. The structural system formed by cable steel has a certain bearing capacity and stability, so in the field of engineering practice, It is particularly important to study the mechanical properties of the connections between prestressed steel cables and steel structures. In this paper, the friction and wear between the steel strands and the connectors and clamps are discussed in this paper. Contact extrusion and other problems are deeply analyzed and discussed. The main contents of this paper are as follows:. 1. Through the reciprocating loading test of the steel structure model of the cable-steel transfer joint, the relative friction slip between the cable and the joint, the different loading stress ratio and the different contact material conditions are studied. The damage of Galfan coating and connectors, and the variation of tensile force and friction force of steel cable; 2. Through the finite element model analysis of the cable steel transfer joint, the stress distribution of the surface wire is studied under different contact conditions between the cable and the connector, and the value of the stress magnification factor 尉 is obtained. It reflects the difference of damage degree of surface wire under different contact conditions of cable and steel. The conclusions of this paper are as follows:. 1. If the cable is in the state of high tensile stress and there is reciprocating friction and slip between the cable and the connector, the coating on the surface of the steel cable will easily crack, and the cracks will spread rapidly and converge and eventually lead to the bulk fall off of the coating. Subsequently, the surface of cable steel matrix is exposed, and the damage degree of cable surface will be aggravated obviously. 2. The addition of different contact media to the contact surface between the cable and the cable clip, It can be obtained that the damage degree of the steel wire at the transfer node after reciprocating loading is as follows: direct contact of galvanized aluminum alloy cable steel with common rubber cushion and thin aluminum sheet cushion plus wear-resistant rubber cushion; 3. In the process of reciprocating loading, the tensile force of steel cable decreases gradually, the tension loss is stable at the beginning of loading, and in the middle of loading, there is a steady growth process, and then it tends to be stable at the later stage of loading. The friction force of the steel cable changes steadily during the whole loading process. 4. The damage degree of Galfan coating on the surface layer of cable can be related to stress magnification factor 尉. According to the different contact conditions between cables and steel, the stress magnification factor varies in the range of 1.101.25. In this range, the damage degree of surface wire changed greatly, while the damage degree of Galfan coating changed steadily.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU394

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