本文選題：摩擦型高強(qiáng)螺栓 + 螺栓缺失�。� 參考：《石家莊鐵道大學(xué)》2014年碩士論文

【摘要】：近年來隨著重載列車的運(yùn)行，使得既有鐵路鋼橋的各種病害仍時(shí)有發(fā)生，嚴(yán)重影響了橋梁的使用壽命和行車安全性。本文依托鐵道部資助項(xiàng)目《重載列車作用下既有鋼桁梁橋的檢測(cè)評(píng)估與病害整治技術(shù)研究》(2011G016-C)，以新兗線上行長(zhǎng)東黃河橋鋼桁梁連續(xù)梁部分每年維修更換大約1200條折斷的高強(qiáng)度螺栓為背景，利用ANSYS軟件建立有限元模型，分析螺栓破壞或缺失對(duì)鋼桁梁橋的影響，，主要結(jié)論如下： (1)螺栓缺失對(duì)短列摩擦型高強(qiáng)螺栓接頭傳力比和拼接板應(yīng)力造成的影響分別局限在2倍和1倍螺栓間距范圍之內(nèi)，但會(huì)造成缺失排剩余螺栓摩擦力增大，傳力比增加；在螺栓缺失處，拼接板應(yīng)力明顯減小，但未缺失處應(yīng)力沒有明顯改變，芯板應(yīng)力沿軸向和橫向均有所增加，但變化不大； (2)短列摩擦型高強(qiáng)螺栓接頭各排螺栓隨荷載的增加依次出現(xiàn)滑移，傳力比較大螺栓排首先出現(xiàn)滑移；螺栓缺失后，當(dāng)所加荷載值較小時(shí)，各排螺栓的傳力比保持開始的變化值不變，當(dāng)荷載繼續(xù)增加時(shí)，傳力比的變化值也隨之變化，剩余的螺栓按傳力大小依次出現(xiàn)滑移； (3)長(zhǎng)列摩擦型高強(qiáng)螺栓接頭在軸力作用下各排傳力比呈馬鞍型分布，但實(shí)際節(jié)點(diǎn)板中由于螺栓排列的不均勻，會(huì)導(dǎo)致個(gè)別位置傳力比有突變；在螺栓連接的計(jì)算中應(yīng)考慮一排內(nèi)螺栓傳力的不均勻性； (4)長(zhǎng)列摩擦型高強(qiáng)螺栓接頭每排螺栓的單個(gè)螺栓滑移順序不一致，靠近板中線的螺栓滑移量比較大，依次向板的邊緣減��；無(wú)缺失狀態(tài)下，各排螺栓沿板寬度方向所傳剪力并不均勻，由板中間向兩邊遞減，進(jìn)入局部滑移狀態(tài)后，剪力沿寬度方向的不均勻性增加，該排螺栓全面滑移后達(dá)到均勻分布。
[Abstract]:In recent years, with the operation of heavy-haul trains, various diseases of existing railway steel bridges still occur from time to time, which seriously affect the service life and safety of the bridges. This paper relies on the project supported by the Ministry of Railways < Detection, Evaluation and Disease treatment Technology of existing Steel Truss Bridges under the Action of heavy haul Train "2011G016-C, about 1200 fold of steel truss girder continuous beam maintenance and replacement each year by the Governor of the New Yanline East Yellow River Bridge Broken high strength bolts for the background, The finite element model is established by using ANSYS software to analyze the influence of bolt failure or loss on steel truss bridge. The main conclusions are as follows: (1) the effect of bolt deficiency on the transmission ratio of short row friction high strength bolt joint and the stress of splice plate are limited within the range of 2 times and 1 times of bolt spacing, respectively. However, the friction force of the missing residual bolt increases and the transfer force ratio increases; at the lack of bolt, the stress of the splice plate decreases obviously, but the stress of the unmissing plate does not change obviously, and the stress of the core plate increases along the axis and lateral direction, but the change is not obvious. (2) the slippage of each row bolt in short row friction type high-strength bolt joint is followed by the increase of load, and the slip occurs first in the larger bolt row with higher load transfer, and after the bolt is missing, when the load value is small, The load transfer ratio of each row of bolts remains unchanged at the beginning, and when the load continues to increase, the change value of the transmission force ratio also changes, and the remaining bolts slip according to the magnitude of the transmission force. (3) the load transfer ratio of long row friction type high strength bolt joint under axial force is a saddle type distribution, but in the actual joint plate, because of the uneven arrangement of bolts, it will lead to sudden change of transmission force ratio in individual position. In the calculation of bolt connection, the inhomogeneity of internal bolt transmission should be taken into account. (4) the slip sequence of single bolt in each row of long row friction type high strength bolt joint is inconsistent, and the slip amount of bolt near the middle line of plate is relatively large. The shear force propagated along the width direction of the plate was not uniform, but decreased from the middle of the plate to the two sides, and the non-uniformity of the shear force along the width direction increased after entering the local slip state. After the row bolt slips, it reaches uniform distribution.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.36

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