公路大跨度連續(xù)剛架拱橋組合鋼箱加固技術研究
發(fā)布時間：2018-11-21 06:51
【摘要】：剛架拱橋因其結構特點簡潔美觀,施工簡單和造價經濟,在公路橋梁中得到了廣泛使用,尤其在高速公路跨線橋和軟土地基橋梁中優(yōu)勢明顯,發(fā)展前景廣闊。甘肅省在近年來也修建了一定數(shù)量的剛架拱橋,其中有代表性的有定西市云田大橋、白銀市懸冒臺橋、永靖縣西河二房村鋼筋混凝土剛架拱橋等。但由于其整體性差,以至于橋梁橫向穩(wěn)定性不足,當前大多數(shù)這類橋已處于危橋行列,因此此類橋加固的意義非同凡響。橋梁加固的方式有很多種,本文則著重介紹鋼箱加固法。它的發(fā)展基礎理論是鋼—混組合梁,是由原先的粘鋼和增大截面兩種加固方式優(yōu)點結合成一種的新型方法。首先需要在拱底及拱肋兩側錨粘鋼板并焊接成H型套箍,接著會在下緣焊接一層鋼板目的使其成為一個封閉式的鋼箱,這樣就和需要加固的拱肋形成了一個整體,此種加固方式提高了梁體的剛度和承載能力,與普通的粘鋼和增大截面法相比,鋼箱加固的構件整體抗彎、抗剪性能有了顯著的提高且自重不會太大。本文以S209線云田大橋為背景,系統(tǒng)的研究了鋼箱加固法在剛架拱橋加固中的應用,主要完成以下幾個方面的內容:(1)根據(jù)鋼—混組合梁理論以及彈塑性理論分析了橋梁結構粘鋼加固的抗彎、抗剪計算并推導其相應的理論計算公式。(2)調查研究了云田大橋的病害及其形成機理,采用鋼箱加固法對主拱肋進行了加固并結合數(shù)值計算分析,對橋梁的加固效果進行了評價。(3)利用ANSYS有限元模型,通過對該橋不同厚度鋼箱加固以及荷載遞變加載過程前后的理論模型對比分析,討論其對主拱肋的力學性能及加固效果影響。(4)最后本文通過可靠度理論對加固后的橋梁進行加固效果評定。由本文研究成果得出:當橋梁的抗彎承載能力不足時,鋼箱加固法具有良好的加固效果,如增大了拱的剛度以及抗彎抗剪承載能力,有效的降低了加固拱跨中的撓度。用鋼砼組合結構理論來計算鋼箱加固構件的承載力是可行的。因此該加固法可大力推廣至此相似類型橋梁中。
[Abstract]:Rigid-frame arch bridge is widely used in highway bridges because of its simple and beautiful structure, simple construction and economical cost, especially in highway bridge and soft ground bridge. In recent years, a certain number of rigid arch bridges have been built in Gansu Province, including Yuntian Bridge in Dingxi City, suspended platform Bridge in Baiyin City, and reinforced concrete rigid frame Arch Bridge in Xihe Erfang Village, Yongjing County. However, due to its poor integrity, so that the bridge lateral stability is not enough, most of these bridges have been in danger, so the significance of this kind of bridge reinforcement is extraordinary. There are many ways to strengthen bridges. This paper mainly introduces steel box reinforcement method. Its basic theory is steel-concrete composite beam, which is a new method, which combines the advantages of two reinforcement methods, one of which is steel bonding and the other is increasing section. First of all, the steel plate must be glued to the bottom of the arch and the sides of the arch rib and welded to H type hoop, and then a layer of steel plate will be welded at the lower edge so that it becomes a closed steel box, thus forming a whole with the arch rib that needs to be strengthened. The stiffness and bearing capacity of the beam are improved by this reinforcement method. Compared with the common steel bonding and increasing section method, the overall bending resistance and shear resistance of the steel box strengthened members are significantly improved and the deadweight is not too large. Based on Yuntian Bridge of S209 Line, this paper systematically studies the application of steel box reinforcement method in the reinforcement of rigid frame arch bridge. The main contents are as follows: (1) according to the theory of steel-concrete composite beam and elastic-plastic theory, the bending resistance of bridge structure strengthened with steel bonded steel is analyzed. The calculation of shear resistance and the corresponding theoretical calculation formula are derived. (2) the disease of Yuntian Bridge and its formation mechanism are investigated, and the main arch rib is strengthened with steel box reinforcement method and analyzed by numerical calculation. The reinforcement effect of the bridge is evaluated. (3) by using the ANSYS finite element model, the theoretical models before and after the reinforcement of the steel box with different thickness and the load changing loading process are compared and analyzed. The influence on the mechanical properties and reinforcement effect of the main arch rib is discussed. (4) finally, the reliability theory is used to evaluate the strengthening effect of the strengthened bridge. From the research results of this paper, it is concluded that when the flexural bearing capacity of the bridge is insufficient, the steel box strengthening method has good reinforcement effect, such as increasing the stiffness of the arch and the bearing capacity of bending and shear resistance, effectively reducing the deflection in the strengthened arch span. It is feasible to calculate the bearing capacity of steel box reinforced members by using the theory of steel-concrete composite structure. Therefore, the reinforcement method can be greatly extended to similar types of bridges.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.72
[Abstract]:Rigid-frame arch bridge is widely used in highway bridges because of its simple and beautiful structure, simple construction and economical cost, especially in highway bridge and soft ground bridge. In recent years, a certain number of rigid arch bridges have been built in Gansu Province, including Yuntian Bridge in Dingxi City, suspended platform Bridge in Baiyin City, and reinforced concrete rigid frame Arch Bridge in Xihe Erfang Village, Yongjing County. However, due to its poor integrity, so that the bridge lateral stability is not enough, most of these bridges have been in danger, so the significance of this kind of bridge reinforcement is extraordinary. There are many ways to strengthen bridges. This paper mainly introduces steel box reinforcement method. Its basic theory is steel-concrete composite beam, which is a new method, which combines the advantages of two reinforcement methods, one of which is steel bonding and the other is increasing section. First of all, the steel plate must be glued to the bottom of the arch and the sides of the arch rib and welded to H type hoop, and then a layer of steel plate will be welded at the lower edge so that it becomes a closed steel box, thus forming a whole with the arch rib that needs to be strengthened. The stiffness and bearing capacity of the beam are improved by this reinforcement method. Compared with the common steel bonding and increasing section method, the overall bending resistance and shear resistance of the steel box strengthened members are significantly improved and the deadweight is not too large. Based on Yuntian Bridge of S209 Line, this paper systematically studies the application of steel box reinforcement method in the reinforcement of rigid frame arch bridge. The main contents are as follows: (1) according to the theory of steel-concrete composite beam and elastic-plastic theory, the bending resistance of bridge structure strengthened with steel bonded steel is analyzed. The calculation of shear resistance and the corresponding theoretical calculation formula are derived. (2) the disease of Yuntian Bridge and its formation mechanism are investigated, and the main arch rib is strengthened with steel box reinforcement method and analyzed by numerical calculation. The reinforcement effect of the bridge is evaluated. (3) by using the ANSYS finite element model, the theoretical models before and after the reinforcement of the steel box with different thickness and the load changing loading process are compared and analyzed. The influence on the mechanical properties and reinforcement effect of the main arch rib is discussed. (4) finally, the reliability theory is used to evaluate the strengthening effect of the strengthened bridge. From the research results of this paper, it is concluded that when the flexural bearing capacity of the bridge is insufficient, the steel box strengthening method has good reinforcement effect, such as increasing the stiffness of the arch and the bearing capacity of bending and shear resistance, effectively reducing the deflection in the strengthened arch span. It is feasible to calculate the bearing capacity of steel box reinforced members by using the theory of steel-concrete composite structure. Therefore, the reinforcement method can be greatly extended to similar types of bridges.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U445.72
【參考文獻】
相關期刊論文 前10條
1 胡淼;孫曉龍;張偉;;大跨剛架拱橋病害分析及加固研究[J];城市道橋與防洪;2013年08期
2 林于東;夏樟華;黃O銸，
本文編號：2346211
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