公路大跨度连续刚架拱桥组合钢箱加固技术研究
发布时间：2018-11-21 06:51
【摘要】：刚架拱桥因其结构特点简洁美观,施工简单和造价经济,在公路桥梁中得到了广泛使用,尤其在高速公路跨线桥和软土地基桥梁中优势明显,发展前景广阔。甘肃省在近年来也修建了一定数量的刚架拱桥,其中有代表性的有定西市云田大桥、白银市悬冒台桥、永靖县西河二房村钢筋混凝土刚架拱桥等。但由于其整体性差,以至于桥梁横向稳定性不足,当前大多数这类桥已处于危桥行列,因此此类桥加固的意义非同凡响。桥梁加固的方式有很多种,本文则着重介绍钢箱加固法。它的发展基础理论是钢—混组合梁,是由原先的粘钢和增大截面两种加固方式优点结合成一种的新型方法。首先需要在拱底及拱肋两侧锚粘钢板并焊接成H型套箍,接着会在下缘焊接一层钢板目的使其成为一个封闭式的钢箱,这样就和需要加固的拱肋形成了一个整体,此种加固方式提高了梁体的刚度和承载能力,与普通的粘钢和增大截面法相比,钢箱加固的构件整体抗弯、抗剪性能有了显著的提高且自重不会太大。本文以S209线云田大桥为背景,系统的研究了钢箱加固法在刚架拱桥加固中的应用,主要完成以下几个方面的内容:(1)根据钢—混组合梁理论以及弹塑性理论分析了桥梁结构粘钢加固的抗弯、抗剪计算并推导其相应的理论计算公式。(2)调查研究了云田大桥的病害及其形成机理,采用钢箱加固法对主拱肋进行了加固并结合数值计算分析,对桥梁的加固效果进行了评价。(3)利用ANSYS有限元模型,通过对该桥不同厚度钢箱加固以及荷载递变加载过程前后的理论模型对比分析,讨论其对主拱肋的力学性能及加固效果影响。(4)最后本文通过可靠度理论对加固后的桥梁进行加固效果评定。由本文研究成果得出:当桥梁的抗弯承载能力不足时,钢箱加固法具有良好的加固效果,如增大了拱的刚度以及抗弯抗剪承载能力,有效的降低了加固拱跨中的挠度。用钢砼组合结构理论来计算钢箱加固构件的承载力是可行的。因此该加固法可大力推广至此相似类型桥梁中。
[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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：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.
【学位授予单位】：兰州交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72
【参考文献】
相关期刊论文 前10条
1 胡淼;孙晓龙;张伟;;大跨刚架拱桥病害分析及加固研究[J];城市道桥与防洪;2013年08期
2 林于东;夏樟华;黄O銸，
本文编号：2346212
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