本文選題：板桁組合結(jié)構(gòu) + 整體節(jié)點(diǎn)��； 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：本文采用Midas Civil軟件對(duì)雙線鐵路板桁組合鋼桁梁橋建立了基于板梁混合單元的全橋空間有限元模型,研究分析了下承式簡(jiǎn)支鋼桁梁橋在不同荷載工況下的受力特性。接著采用有限元軟件Ansys Workbench從構(gòu)造細(xì)節(jié)方面對(duì)整體節(jié)點(diǎn)的應(yīng)力分布、高強(qiáng)螺栓預(yù)緊力損失、接觸應(yīng)力進(jìn)行了較深入的分析。本文主要研究工作和成果如下:1、采用SPB板梁混合單元法并考慮剛域效應(yīng)對(duì)板桁組合鋼桁梁橋建立了全橋有限元模型,針對(duì)橋梁在不同工況(恒載、最不利活載、主力以及主力和附加力組合作用)下的受力特性進(jìn)行了分析。計(jì)算分析結(jié)果表明:該橋整體受力合理,強(qiáng)度和剛度都符合鐵路橋梁規(guī)范設(shè)計(jì)要求。2、對(duì)主桁下弦桿節(jié)點(diǎn)進(jìn)行了主力荷載作用下的局部分析。計(jì)算結(jié)果表明:考慮高強(qiáng)螺栓時(shí)節(jié)點(diǎn)板的應(yīng)力集中點(diǎn)數(shù)值比不考慮螺栓時(shí)小,在節(jié)點(diǎn)板圓弧部位、節(jié)點(diǎn)板與底板連接部位、節(jié)點(diǎn)板與縱肋相交處應(yīng)力集中程度較高,等效應(yīng)力較大,但未超過(guò)材料的屈服強(qiáng)度。3、對(duì)內(nèi)外側(cè)節(jié)點(diǎn)板上的高強(qiáng)螺栓預(yù)緊力損失進(jìn)行了分析,解釋了螺栓施擰時(shí)為何提高預(yù)拉力的原因,同時(shí)為不同位置的螺栓施擰提供了參考。4、從摩擦應(yīng)力、擠壓應(yīng)力、滑移距離、滲透距離四個(gè)方面對(duì)接觸面間應(yīng)力狀態(tài)進(jìn)行了研究,得出了摩擦應(yīng)力與擠壓應(yīng)力的分布規(guī)律;根據(jù)滑移距離判斷出板束間產(chǎn)生了“解扣滑移”現(xiàn)象,使得節(jié)點(diǎn)板內(nèi)力發(fā)生了重分布。5、通過(guò)約束端支反力與各桿件內(nèi)力驗(yàn)算后,可得出以下結(jié)論:考慮高強(qiáng)度螺栓的局部分析模型很好的模擬了整體節(jié)點(diǎn)板的真實(shí)受力狀態(tài),與整體模型分析結(jié)果基本吻合,且反映出整體模型所不具有的應(yīng)力集中、高強(qiáng)螺栓應(yīng)力傳遞等現(xiàn)象。
[Abstract]:In this paper, Midas Civil software is used to establish the spatial finite element model of the whole bridge based on the plate and beam hybrid element for the composite steel truss bridge of double-track railway, and the stress characteristics of the through simply supported steel truss bridge under different load conditions are studied and analyzed. Then, the stress distribution of the whole joint, the loss of pretightening force of high strength bolt and the contact stress of the whole joint are analyzed in detail by the finite element software Ansys Workbench. In this paper, the main research work and results are as follows: 1. Using SPB slab beam hybrid element method and considering the rigid domain effect, the finite element model of the whole bridge is established, aiming at the bridge under different working conditions (dead load, most unfavorable live load). The force characteristics of the main force and the combination of the main force and the additional force are analyzed. The results of calculation and analysis show that the overall force of the bridge is reasonable and the strength and stiffness are in line with the design requirements of the railway bridge code. The local analysis of the chord joint under the main truss is carried out under the main force load. The results show that the stress concentration point of the joint plate is smaller when considering the high strength bolt than when the bolt is not taken into account, and the stress concentration is higher at the arc part of the joint plate, the connection between the joint plate and the bottom plate, and the intersection of the joint plate and the longitudinal rib. The equivalent stress is large, but does not exceed the yield strength of the material. The loss of pretension force of the high strength bolt on the inner and outer joint plate is analyzed, and the reason why the pretension force is increased when the bolt is twisted is explained. At the same time, it provides a reference for bolting in different positions. The stress state of contact plane is studied from four aspects: friction stress, extrusion stress, slip distance and penetration distance, and the distribution of friction stress and extrusion stress is obtained. According to the slip distance, the phenomenon of "unbuckling and sliding" occurred between the plates and bundles, which made the internal force of the joint plate redistribute .5.After checking the reaction force of the restrained end support and the internal force of each member, The following conclusions can be drawn: considering the local analysis model of high strength bolt, the real stress state of the whole joint plate is well simulated, which is basically consistent with the analysis result of the whole model, and reflects the stress concentration which the whole model does not have. High strength bolt stress transfer and other phenomena.
【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(lèi)號(hào)】：U441

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