本文選題：雙曲拱橋　切入點(diǎn)：檢測(cè)　出處：《南京工業(yè)大學(xué)》2015年碩士論文

【摘要】：老舊雙曲拱橋由于建造年代久遠(yuǎn),維修保養(yǎng)落后,其損壞嚴(yán)重,因此對(duì)雙曲拱橋進(jìn)行檢測(cè)、加固是一項(xiàng)十分重要且有意義的事情。但目前現(xiàn)有的雙曲拱橋檢測(cè)項(xiàng)目和檢測(cè)方法并不完善,其技術(shù)狀況評(píng)定方法也存在可優(yōu)化之處,針對(duì)拱頂、拱腳正負(fù)彎矩過大的雙曲拱橋的加固技術(shù)研究較少。本文通過理論研究、有限元計(jì)算并結(jié)合工程實(shí)踐,對(duì)雙曲拱橋的檢測(cè)、評(píng)定及加固技術(shù)進(jìn)行了研究：(1)對(duì)拱軸線測(cè)量及構(gòu)件混凝土強(qiáng)度檢測(cè)等提出了改進(jìn)的檢測(cè)方法,為雙曲拱橋的檢測(cè)工作提供了依據(jù)；(2)雙曲拱橋技術(shù)狀況評(píng)定中對(duì)拱軸線變形形式?jīng)]有分類,對(duì)變形程度只有定性描述沒有定量標(biāo)準(zhǔn),本文將拱軸線變形分為“M”形和均勻變形兩種形式。利用MIDAS-CIVIL建立不同跨徑、不同矢跨比的橋梁平面桿系模型,以拱頂變形值為目標(biāo)參數(shù),分析不同偏離值下拱圈控制截面內(nèi)力、撓度變化情況。按照內(nèi)力及撓度變化率相同的原則參考現(xiàn)有評(píng)定標(biāo)準(zhǔn)中對(duì)構(gòu)件技術(shù)狀況的描述,將拱頂偏離值劃分為不同的區(qū)間,以此區(qū)間作為拱軸線變形評(píng)定標(biāo)度的界限,完善了雙曲拱橋拱軸線變形評(píng)定標(biāo)準(zhǔn)：(3)現(xiàn)有雙曲拱橋技術(shù)狀況評(píng)定中對(duì)拱腳位移評(píng)定標(biāo)準(zhǔn)不夠明確,為此本文利用MIDAS-CIVIL建立不同跨徑、不同矢跨比的橋梁平面桿系模型,分析不同拱腳位移下,拱圈控制截面內(nèi)力、撓度、應(yīng)力及承載力變化情況。并以滿足承載力為原則,通過有限元試算與網(wǎng)格曲線圖結(jié)合確定拱腳位移“限值”。結(jié)果表明,在拱腳位移尚未達(dá)到“限值”之前,各參數(shù)隨拱腳位移增加近似呈線性變化,因此,可將拱腳位移“限值”均分為三個(gè)區(qū)間,作為尚未達(dá)到限值的拱腳位移評(píng)定標(biāo)度的界限,完善了雙曲拱橋拱腳位移評(píng)定標(biāo)準(zhǔn)：(4)針對(duì)拱頂正彎矩過大而出現(xiàn)破壞的雙曲拱橋,提出了體外預(yù)應(yīng)力加固雙曲拱橋拱頂?shù)男路椒?優(yōu)化給出了兩種不同的加固形式�；隗w外預(yù)應(yīng)力在拱頂產(chǎn)生的負(fù)彎矩“抵消”恒載下拱頂正彎矩的原則,理論上推導(dǎo)出了不同布筋形式下預(yù)應(yīng)力筋預(yù)拉力值和錨固位置的計(jì)算公式。采用有限元軟件建立不同跨徑、不同矢跨比的平面桿系模型,分析了兩種布筋形式下不同預(yù)拉力值時(shí)拱圈各截面的應(yīng)力、撓度、承載能力的變化情況。結(jié)果表明,拱頂采用體外預(yù)應(yīng)力加固可以很好地“抵消”拱頂正彎矩,降低拱頂下緣拉應(yīng)力、高拱頂截面承載能力；(5)以貴州省孟彥大橋?yàn)閷?shí)例,采用改進(jìn)優(yōu)化后的檢測(cè)、評(píng)定方法對(duì)該橋進(jìn)行檢測(cè)評(píng)定。結(jié)果表明,該橋上、下部結(jié)構(gòu)裂縫較多,變形較大損壞嚴(yán)重,評(píng)定為四類橋(需加固)。針對(duì)該橋拱頂下緣開裂的破壞情況,結(jié)合體外預(yù)應(yīng)力加固方法的研究采用直線式體外預(yù)應(yīng)力加固該橋,并進(jìn)行加固計(jì)算和加固效果分析。結(jié)果表明,加固減少了拱頂下緣拉應(yīng)力、提高了拱頂承載力。
[Abstract]:The old double-curved arch bridge is damaged seriously because of its long construction, backward repair and maintenance, so it is very important and meaningful to inspect and strengthen the hyperbolic arch bridge.However, the existing inspection items and detection methods of hyperbolic arch bridge are not perfect, and the evaluation method of its technical condition can also be optimized. There is little research on reinforcement technology of hyperbolic arch bridge with arch roof and too large positive and negative moment of arch foot.In this paper, through theoretical research, finite element calculation and engineering practice, the detection, evaluation and reinforcement technology of hyperbolic arch bridge are studied.This paper provides a basis for the inspection of hyperbolic arch bridge. In the evaluation of the technical condition of hyperbolic arch bridge, there is no classification of deformation form of arch axis, but there is no quantitative standard for qualitative description of deformation degree.In this paper, the arch axis deformation is divided into "M" shape and uniform deformation.In this paper, MIDAS-CIVIL is used to establish a bridge plane bar system model with different span and different ratio of span to span. Taking the deformation value of arch top as the target parameter, the variation of internal force and deflection of arch ring control section under different deviations is analyzed.According to the principle of the same change rate of internal force and deflection, according to the description of the technical condition of the component in the existing evaluation standard, the deviation value of the vault is divided into different intervals, which is used as the limit of the evaluation scale of the deformation of the arch axis.This paper improves the evaluation standard of arch axis deformation of hyperbolic arch bridge: (3) the evaluation standard of arch foot displacement of hyperbolic arch bridge is not clear enough in the current evaluation of the technical condition of hyperbolic arch bridge. In this paper, MIDAS-CIVIL is used to establish the bridge plane bar system model with different span and different rise-span ratio.The variation of internal force, deflection, stress and bearing capacity of arch ring control section under different arch foot displacement is analyzed.Based on the principle of satisfying the bearing capacity, the finite value of arch foot displacement is determined by the combination of finite element test and grid graph.The results show that before the arch foot displacement reaches the "limit value", each parameter changes approximately linearly with the arch foot displacement increase. Therefore, the arch foot displacement "limit value" can be divided into three intervals.As the limit limit of arch foot displacement evaluation scale, the standard of arch foot displacement evaluation of hyperbolic arch bridge is improved.A new method for strengthening the vault of double curved arch bridge with external prestressing is proposed, and two different reinforcement forms are given.Based on the principle of "counteracting" the negative moment produced by external prestressing in the vault under dead load, the formulas for calculating the pretension force and the anchoring position of the prestressed tendons under different reinforcement forms are derived theoretically.The finite element software is used to establish a plane bar system model with different span and different rise-span ratio, and the variation of stress, deflection and bearing capacity of arch ring under different pretension force under two kinds of tendons is analyzed.The results show that the external prestressing reinforcement of the arch roof can "offset" the positive moment of the arch roof, reduce the tensile stress at the lower edge of the vault, and the bearing capacity of the section of the high arch roof can be reduced.) taking the Mengyan Bridge in Guizhou Province as an example, the improved and optimized test is adopted.The bridge was tested and evaluated by the evaluation method.The results show that there are many cracks in the substructure of the bridge, and the deformation is serious, which is assessed as four types of bridges (need to be strengthened).In view of the cracking of the lower edge of the arch roof of the bridge, combined with the study of the external prestressing reinforcement method, the bridge was strengthened with the external prestressing force of the straight line, and the reinforcement calculation and the effect analysis were carried out.The results show that the reinforcement reduces the tensile stress at the lower edge of the arch roof and increases the bearing capacity of the arch roof.
【學(xué)位授予單位】：南京工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U446;U445.72

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