本文選題：簡支T梁 + 橫向加固��； 參考：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：橫向聯(lián)系是橋梁的重要構(gòu)件,在提高橋梁整體剛度、保持橋梁完整性與穩(wěn)定性方面發(fā)揮著至關(guān)重要的作用。橋梁結(jié)構(gòu)的橫向剛度和整體性會隨著橫向聯(lián)系的失效而降低,同時不同梁體之間的協(xié)同工作受到破壞,橋梁在橫向不再形成一個整體。橫向聯(lián)系完全破壞或失去作用時會出現(xiàn)“單梁受力”的情況,給橋梁安全造成很大影響。本文通過對公路多片式及鐵路雙片式簡支梁橋的結(jié)構(gòu)特點和動靜力特性進行研究分析,提出了多種針對橫向聯(lián)系進行加固的有效方案。分別計算多片式公路及雙片式鐵路簡支梁橋的動靜力特性以及其隨著不同加固方法的變化情況,從而得到橫向聯(lián)系在不同加固方法下對橋梁結(jié)構(gòu)動靜力行為的影響規(guī)律。論文主要工作如下:首先,以公路多片式簡支梁橋為研究對象,按照對于橫向聯(lián)系的不同加固方案,利用有限元分析軟件ANSYS建立分析模型,對結(jié)構(gòu)的動力特性進行計算分析。橫向聯(lián)系加固主要通過:1)在原有橫隔板上粘貼型鋼及鋼板、2)在梁體之間增加鋼橫撐、3)在梁體之間施加橫向預(yù)應(yīng)力、4)在梁體之間增加鋼橫隔板等四種方法。其次,介紹了公路多片式簡支梁橋荷載橫向分布的基本理論,并對荷載橫向分布系數(shù)的計算公式運用模態(tài)參數(shù)法進行了推導(dǎo)。在此基礎(chǔ)上,依據(jù)ANSYS模態(tài)分析所得到的數(shù)據(jù)結(jié)果,利用得到的荷載橫向分布系數(shù)計算公式,計算原結(jié)構(gòu)及采用不同加固方法加固后結(jié)構(gòu)的荷載橫向分布系數(shù),得到其分布變化規(guī)律。最后,以鐵路雙片式簡支梁橋為研究對象,對梁體的空間振動特性進行分析。按增加的橫系梁在梁體的不同位置和預(yù)緊鋼筋預(yù)緊力的不同參數(shù)值分別建立分析模型,研究其對梁體自振頻率的影響。由自振頻率的變化來分析和確定橫系梁和預(yù)緊鋼筋的具體設(shè)置形式對橋梁結(jié)構(gòu)橫、豎向剛度的作用,確定合理的加固形式。研究結(jié)果表明,對于公路多片式簡支梁橋橫向聯(lián)系的加固,采用增加鋼橫撐和增加鋼橫隔板方法,梁體橫向剛度明顯提高,豎向剛度降低較少,同時荷載橫向分布系數(shù)分布也較為均勻,加固效果明顯;對于鐵路雙片式簡支梁橋,采用方案一進行加固,在較大幅度提高其橫向剛度的同時,豎向剛度降低較少,加固效果明顯。本文所提出的橫向聯(lián)系加固方法及其確定思路可以作為在設(shè)計同類橋梁橫向加固方案時參考及借鑒。
[Abstract]:Transverse connection is an important component of bridge, which plays an important role in improving the overall stiffness of the bridge and maintaining the integrity and stability of the bridge. The transverse stiffness and integrity of the bridge structure will decrease with the failure of the transverse connection, and the cooperative work between different beams will be destroyed, so the bridge will no longer form a whole in the transverse direction. The "single beam force" will occur when the transverse connection is destroyed or lost, which has a great impact on the safety of the bridge. In this paper, the structural characteristics and dynamic characteristics of multi-piece highway and railway double-piece simply supported beam bridges are studied and analyzed, and several effective schemes for strengthening transverse connections are put forward. The dynamic and dynamic characteristics of multi-piece highway and double-piece railway simply supported beam bridge are calculated, and the dynamic and dynamic behaviors of bridge structure under different reinforcement methods are obtained. The main work of this paper is as follows: firstly, the multi-piece simply supported bridge of highway is taken as the research object. According to the different reinforcement schemes for the transverse connection, the finite element analysis software ANSYS is used to establish the analysis model to calculate and analyze the dynamic characteristics of the structure. Transverse connection strengthening is mainly done by means of: 1) adding steel bar and steel plate 2) adding steel transverse bracing 3) adding transverse prestressing force between beams 4) adding steel cross diaphragm between beams. Secondly, the basic theory of lateral load distribution of highway multi-piece simply supported beam bridge is introduced, and the calculation formula of load transverse distribution coefficient is deduced by modal parameter method. On this basis, according to the data obtained from ANSYS modal analysis, the transverse load distribution coefficient of the original structure and the strengthened structure with different reinforcement methods is calculated by using the calculated formula of load transverse distribution coefficient. The law of its distribution variation is obtained. Finally, the spatial vibration characteristics of the beam body are analyzed by taking the railway double-sheet simply supported beam bridge as the research object. According to the different position of the increased transverse beam in the beam and the different parameter values of the pretension force of the prestressing bar, the analysis model is established, and the influence of the model on the natural vibration frequency of the beam is studied. According to the change of natural vibration frequency, the effect of the concrete setting form of the transverse beam and the prestressing bar on the transverse and vertical stiffness of the bridge structure is analyzed and determined, and the reasonable reinforcement form is determined. The results show that the transverse stiffness of the beam body is obviously increased and the vertical stiffness is reduced less by increasing the steel transverse bracing and increasing the steel transverse partition for the reinforcement of the transverse connection of the highway multi-piece simply supported beam bridge, and the results show that the transverse stiffness of the beam is obviously increased, and the vertical stiffness is reduced less. At the same time, the distribution of transverse load distribution coefficient is also more uniform, and the reinforcement effect is obvious. The reinforcement effect is obvious. The method of transverse connection reinforcement and its determination can be used for reference in the design of similar bridge transverse reinforcement scheme.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U441;U445.72

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