本文關(guān)鍵詞： 系桿拱橋 吊桿索力 未知系數(shù)法 振動(dòng)頻率法　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：系桿拱橋一種是外部靜定、內(nèi)部超靜定的梁拱組合結(jié)構(gòu),主要受力構(gòu)件是拱肋、系梁和吊桿。系梁直接承受橋面荷載,通過吊桿將大部分荷載傳遞給拱肋,再由拱肋和系梁的結(jié)合部傳遞到支座和下部結(jié)構(gòu)。可見吊桿是連接系梁和拱肋的主要傳力構(gòu)件。吊桿索力分布是否合理,將直接影響到系桿拱橋結(jié)構(gòu)的線形及內(nèi)力分布的均勻性,嚴(yán)重時(shí),還會(huì)關(guān)系到橋梁能否正常運(yùn)營(yíng),甚至影響結(jié)構(gòu)的壽命。因此,如何確定合理吊桿索力,如何在施工過程中將吊桿張拉至設(shè)計(jì)目標(biāo)狀態(tài),是系桿拱橋設(shè)計(jì)和施工過程中的關(guān)鍵問題之一。 本文在以現(xiàn)有確定合理吊桿索力方法為基礎(chǔ),結(jié)合實(shí)際工程,運(yùn)用MIDAS軟件中的未知系數(shù)法確定了玉帶橋施工階段的合理吊桿索力。通過正裝迭代法,對(duì)玉帶橋施工階段的張拉吊桿索力進(jìn)行了計(jì)算,確定了三種張拉順續(xù)及其相應(yīng)的張拉力,無論采用哪一種方法,均能一次張拉到位,為施工提供了方便。在已建計(jì)算模型基礎(chǔ)上,分析了端橫梁的局部約束對(duì)靠近拱腳處的吊桿索力的影響。論文還采用影響矩陣計(jì)算施調(diào)向量的方法,對(duì)東風(fēng)大橋更換吊桿后二次調(diào)索的吊桿索力和順序進(jìn)行了計(jì)算,并應(yīng)用于現(xiàn)場(chǎng)監(jiān)控,經(jīng)與現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)對(duì)比,驗(yàn)證了本方法的正確性。 最后,基于拉索振動(dòng)頻率理論解和有限元方法,對(duì)影響吊桿振動(dòng)頻率的主要因素進(jìn)行了分析,可作為振動(dòng)頻率法檢測(cè)吊桿索力的參考。
[Abstract]:A beam-arch composite structure with external statically indeterminate and indeterminate interior. The main force members are arch ribs, girders and suspenders. The girders bear the bridge deck loads directly and transfer most of the loads to the arch ribs through the suspenders. Then it is transferred from the joint of arch rib and tie beam to the support and substructure. It can be seen that the suspender is the main force transfer member connecting the tie beam and the arch rib. It will directly affect the uniformity of the linear shape and internal force distribution of the tied arch bridge structure. When serious, it will also affect the normal operation of the bridge and even the life of the structure. Therefore, how to determine the rational cable force of the suspension rod, It is one of the key problems in the design and construction of tied arch bridge that how to stretch the suspenders to the design target state during the construction process. Based on the existing methods for determining the rational cable force of the suspenders and combining with the actual engineering, this paper uses the unknown coefficient method in the MIDAS software to determine the rational cable force of the suspenders in the construction stage of the jade belt bridge. In this paper, the cable force of the tension suspenders in the construction stage of the jade belt bridge is calculated, and the three kinds of tensioning continuation and the corresponding tensile forces are determined. No matter which method is adopted, the tension can be put in place at one time. On the basis of the established calculation model, the influence of the local constraint of the end beam on the cable force of the suspender near the arch foot is analyzed. The method of calculating the adjusting vector by the influence matrix is also used in this paper. This paper calculates the cable force and sequence of the secondary adjusting cable of Dongfeng Bridge after replacing the suspension rod, and applies it to the field monitoring. The correctness of the method is verified by comparing with the monitoring data on the spot. Finally, based on the theoretical solution of cable vibration frequency and finite element method, the main factors affecting the vibration frequency of suspension rod are analyzed, which can be used as a reference for measuring the cable force of suspension rod by vibration frequency method.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.225

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