本文選題：拓寬T梁橋 + 容許沉降差　； 參考：《長安大學(xué)》2017年碩士論文

【摘要】：公路橋梁改擴建日益增多,拓寬橋新舊部分連接后基礎(chǔ)不均勻沉降致使上部結(jié)構(gòu)產(chǎn)生附加應(yīng)力,影響橋梁使用和安全。實際橋梁拓寬工程復(fù)雜多樣,目前在公路拓寬橋的研究中,對沉降應(yīng)力和控制標(biāo)準(zhǔn)都非常重要的沉降模式并沒有被明確定義和分類,沉降控制標(biāo)準(zhǔn)主要集中在拓寬簡支梁或連續(xù)梁橋,基本沒有將二者的進行結(jié)合對比分析以適應(yīng)實際工程。此外,應(yīng)對拓寬橋基礎(chǔ)不均勻沉降差的現(xiàn)行措施一般存在實施復(fù)雜、時間長或成本高等缺點,有待改進。為降低公路拓寬橋梁基礎(chǔ)不均勻沉降給其造成的不利影響。將沉降模式劃分為兩類,依托某拓寬橋,建模計算分析了其基本受力性能,并在此基礎(chǔ)上確定其沉降控制標(biāo)準(zhǔn);最終提出一種新的沉降差應(yīng)對措施,并分析了其合理性和優(yōu)越性。論文主要研究如下:(1)基于部分典型拓寬橋沉降監(jiān)測數(shù)據(jù)和已有研究結(jié)論,并分析了沉降模式差異的原因,將拓寬部分基礎(chǔ)沉降簡化分為兩種,一是線性沉降,即拓寬部分基礎(chǔ)由內(nèi)側(cè)向外側(cè)沉降值逐漸增大,基本呈線性變化,最外側(cè)沉降可視為一個累加值;二是均勻沉降,即拓寬部分基礎(chǔ)沉降值基本接近,沉降可視為連接處新舊T梁的相對沉降值。(2)依托某拓寬T梁橋,采用Midas FEA和Midas Civil建模分析,得出T梁橋拓寬受力最不利位置在支點豎向截面接縫處上緣,新舊T梁最佳受力連接方式為接縫處跨內(nèi)設(shè)置橫隔板,而梁端不設(shè)置,橋墩最不利沉降工況為拓寬部分橋墩全部參與沉降。(3)采用前文得到的最不利沉降工況和最佳連接方式,以上部結(jié)構(gòu)最大拉應(yīng)力是否超過設(shè)計混凝土抗拉強度標(biāo)準(zhǔn)值作為控制標(biāo)準(zhǔn),得出簡支和連續(xù)T梁橋拓寬部分線性沉降下容許沉降差分別為8mm和7mm,均勻沉降下容許沉降差為3mm,均勻沉降情況即任意相鄰兩片T梁,尤其是接縫處新舊T梁間的相對沉降差要控制在3mm以內(nèi)。(4)為提高拓寬T梁橋承受基礎(chǔ)沉降差的能力,提出在舊橋連接中梁(原舊橋邊梁)下設(shè)置軸向剛度略低的支座,并稱為低剛度支座。應(yīng)用低剛度支座后,其不利影響可以忽略,但是對拓寬T梁橋在典型沉降工況下的最大應(yīng)力降低幅度達12.5%—38.1%,對簡支和連續(xù)T梁橋拓寬部分線性沉降下容許沉降差均提高2mm分別至10mm和9mm,均勻沉降下均提高1mm至4mm,說明設(shè)置低剛度支座能夠明顯改善拓寬T梁橋基礎(chǔ)沉降差對上部結(jié)構(gòu)的不利影響,并且還具有實施簡單、時間短和成本低等優(yōu)點,值得推廣應(yīng)用。
[Abstract]:The construction and extension of highway bridges are increasing day by day. The uneven settlement of the foundation after widening the new and old parts of the bridges causes additional stress in the superstructure and affects the use and safety of the bridges. The actual bridge widening project is complex and diverse. At present, in the research of highway widening bridge, the settlement model, which is very important to settlement stress and control standard, has not been clearly defined and classified. The settlement control standard is mainly focused on widening simply supported beam or continuous beam bridge. In addition, the existing measures to widen the uneven settlement of the bridge foundation generally have the disadvantages of complex implementation, long time and high cost, which need to be improved. In order to reduce the adverse effect caused by uneven settlement of widening bridge foundation. The settlement mode is divided into two categories, and based on a widening bridge, the basic force performance of the bridge is modeled and analyzed, and the settlement control standard is determined on this basis. Finally, a new settlement difference response measure is put forward. Its rationality and superiority are analyzed. The main research contents are as follows: (1) based on the monitoring data of settlement of some typical widening bridges and the existing research conclusions, and analyzing the reasons for the difference of settlement modes, the settlement of widening part of foundation is simplified into two kinds, one is linear settlement, the other is linear settlement. That is to say, the settlement value of the widening part of the foundation increases gradually from the inside to the outside, showing a linear change, the most lateral settlement can be regarded as an accumulative value, the second is the uniform settlement, that is, the settlement value of the widening part of the foundation is close to that of the widening part. The settlement can be regarded as the relative settlement value of the old and new T-beam at the junction. Based on a widening T-beam bridge, by using Midas FEA and Midas Civil modeling and analysis, it is concluded that the most disadvantageous position of the widening force of the T-beam bridge is at the upper edge of the joint of the vertical section of the fulcrum. The best way of connecting the old and new T-beams is to set the transverse diaphragm at the joint, but not at the end of the beam. The most unfavorable settlement condition of the pier is to widen the partial pier to participate in the settlement. 3) the most unfavorable settlement condition and the best connection mode obtained from the previous paper are adopted. Whether the maximum tensile stress of the superstructure exceeds the standard value of the designed concrete tensile strength is taken as the control standard. It is obtained that the allowable settlement difference is 8mm and 7mm for the widening partial linear settlement of simply supported and continuous T-beam bridges, and 3mm for uniform settlement. In particular, the relative settlement difference between the new and old T-beams at the joint should be controlled within 3mm. 4) in order to improve the ability of widening the capacity of T-beam bridge to bear the settlement difference of foundation, it is proposed to set up a support with lower axial stiffness under the middle beam of the old bridge connection (the original side beam of the old bridge). They are called low stiffness supports. The adverse effects of the application of low stiffness bearings can be neglected. However, the maximum stress of widening T-beam bridge under typical settlement condition is 12.5-38.1. The allowable settlement difference of simply supported bridge and continuous T-beam bridge under widening partial linear settlement is increased to 10mm and 9mm, respectively, and even settlement is increased under uniform settlement. From 1mm to 4mm, it shows that setting low stiffness supports can obviously improve the adverse effect of widening T-beam bridge foundation settlement difference on the superstructure. It also has the advantages of simple implementation, short time and low cost, so it is worth popularizing and applying.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443

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