【摘要】：斜靠式拱橋由四片拱肋組成，中間兩片為平行豎直拱肋，或外傾拱肋，兩側(cè)各布一傾斜拱肋，，中間平行拱肋為橋梁的主要承重結(jié)構(gòu)，每側(cè)傾斜拱肋與相鄰豎直拱肋構(gòu)成人行橋的空間。這種橋型新穎美觀，造型獨(dú)特，橋面開闊，具有明顯的技術(shù)特點(diǎn)。但此類橋型取消了兩主拱肋之間的橫向支撐，受力及構(gòu)造復(fù)雜，空間效應(yīng)明顯，確定合理的結(jié)構(gòu)設(shè)計(jì)參數(shù)以確保橋梁的穩(wěn)定性，是斜靠式拱橋設(shè)計(jì)的關(guān)鍵性問題之一。本文以廣州市增城大橋?yàn)楣こ瘫尘埃猛ㄓ贸绦駻NSYS建立其空間有限元模型，進(jìn)行了詳細(xì)的彈塑性穩(wěn)定分析計(jì)算，并對斜靠式拱橋彈塑性穩(wěn)定的影響因素進(jìn)行了較細(xì)致的比較分析。論文的主要工作如下： 1.對拱橋和拱橋穩(wěn)定理論的發(fā)展進(jìn)行了回顧和總結(jié)，并對各種分析方法進(jìn)行了討論，以及對拱橋穩(wěn)定的有限元基本理論進(jìn)行了闡述。 2.在增城大橋空間有限元模型的基礎(chǔ)上，運(yùn)用通用程序ANSYS對其分別進(jìn)行了線彈性、幾何非線性和彈塑性穩(wěn)定分析，對他們的異同進(jìn)行了探討，并比較了幾何非線性和材料非線性這兩類非線性因素對結(jié)構(gòu)內(nèi)力和變形的影響。 3.通過有限元模型，分析了三種設(shè)計(jì)參數(shù)（吊桿數(shù)量和間距、橫撐數(shù)量和剛度、斜拱與主拱剛度比）以及兩種荷載要素（均布荷載、橫向風(fēng)載）對斜靠式拱橋極限承載力的影響，此外，還對斜靠式拱橋和普通拱橋的穩(wěn)定性能進(jìn)行了對比分析，更全面地了解了斜靠式拱橋的彈塑性穩(wěn)定性能。 增城大橋是一座典型的斜靠式拱橋，本文的討論和分析結(jié)果能為日后同類橋梁的設(shè)計(jì)建設(shè)提供一定的參考。
[Abstract]:The skew arch bridge is composed of four arch ribs, two of which are parallel vertical arch ribs, or extroverted arch ribs, each with one inclined arch rib on both sides, and the middle parallel arch rib is the main load-bearing structure of the bridge. Each side inclined arch rib and adjacent vertical arch rib constitute the space of pedestrian bridge. This kind of bridge is novel and beautiful, unique in shape, open in deck, and has obvious technical characteristics. However, this kind of bridge cancels the transverse support between two main arch ribs, the force and structure are complicated, and the space effect is obvious. It is one of the key problems in the design of skew arch bridge to determine reasonable structural design parameters to ensure the stability of the bridge. In this paper, based on the engineering background of Zengcheng Bridge in Guangzhou, the spatial finite element model of Zengcheng Bridge is established by using the general program ANSYS, and the elastic-plastic stability analysis and calculation are carried out in detail. The factors influencing the elastoplastic stability of inclined arch bridge are compared and analyzed in detail. The main work of this paper is as follows: 1. This paper reviews and summarizes the development of arch bridge and arch bridge stability theory, discusses various analysis methods, and expounds the basic finite element theory of arch bridge stability. 2. Based on the spatial finite element model of Zengcheng Bridge, the linear elasticity, geometric nonlinearity and elastoplastic stability of Zengcheng Bridge are analyzed by using the general program ANSYS, and their similarities and differences are discussed. The effects of geometric nonlinearity and material nonlinearity on the internal force and deformation of the structure are compared. Based on the finite element model, the effects of three design parameters (the number and spacing of suspenders, the number and stiffness of transverse brace, the ratio of oblique arch and main arch stiffness) and two load elements (uniform load, transverse wind load) on ultimate bearing capacity of inclined arch bridge are analyzed. In addition, the stability performance of skew arch bridge and common arch bridge are compared and analyzed, and the elastoplastic stability of inclined arch bridge is understood more comprehensively. Zengcheng Bridge is a typical inclined arch bridge. The discussion and analysis in this paper can provide some references for the design and construction of similar bridges in the future.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.22

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