双曲拱桥主拱圈加固方法有限元分析

发布时间：2019-05-27 13:46

【摘要】：双曲拱桥以其外形美观、结构新颖、施工方便、省料等优点,迅速在全国范围内得到推广,但随着交通量的增大,大多数在役双曲拱桥梁出现了不同程度的损伤,对安全运营造成威胁,然而,在一定时期内,由于财力有限,许多双曲拱桥将继续使用,短时间内不可能全用新桥替换,对一些桥梁进行维修加固是难以避免的。桥梁的维修加固具有较大的经济效益,因此,对双曲拱桥进行技术改造尤为重要。本文依托旧沧江桥,对双曲拱桥主拱圈加固法进行有限元分析,主要研究及取得的成果如下： 1、通过对比Midas/Civil有限元设计状态下裸拱模型、空间仿真模型及病害条件下的仿真模型得到：双曲拱桥偏于保守的传统计算导致其具有较大的承载潜力,原桥设计荷载等级可达到“公路-Ⅱ级”。 2、通过有限元分析拱肋上、下缘增大截面效果,得出了同等条件下,下缘增大截面效果优于上缘增大截面,随着下缘加固厚度增大,截面安全度提高,当厚度达到一定厚度,原结构在新增混凝土发挥作用之前破坏,合理的加固厚度是加固效果的保证。 3、有限元模型分析粘贴加固技术,得出随着补强钢板厚度的增大,加固效果越来越明显,当全拱加固时,与其他截面相比,钢板加固对跨中截面的加固效果更明显。钢箱拱法加固对结构刚度及应力影响大,对轴力及弯矩影响小。 4、有限元模型分析钢板-碳纤维布加固法,得出了该加固法相当于把拱肋变成变截面拱,使钢板及碳纤维的优点得到发挥,随着钢板及碳纤维布厚度的增加,加固效果越明显,但侧向钢板厚度变化对加固效果的影响较小。
[Abstract]:Double curved arch bridge has been popularized in the whole country because of its beautiful appearance, novel structure, convenient construction and material saving, but with the increase of traffic volume, most of the existing hyperbolic arch bridges have appeared different degrees of damage. However, due to the limited financial resources, many double-curved arch bridges will continue to be used in a certain period of time, and it is impossible to replace them with new bridges in a short period of time, so it is inevitable to repair and strengthen some bridges. The maintenance and reinforcement of bridges has great economic benefits, so it is particularly important to carry out technical transformation of double curved arch bridges. In this paper, based on the old Cangjiang Bridge, the finite element analysis of the main arch ring reinforcement method of double curved arch bridge is carried out. the main research and achievements are as follows: 1, by comparing the bare arch model under the condition of Midas/Civil finite element design, The spatial simulation model and the simulation model under the condition of disease show that the double curved arch bridge has great bearing potential due to its conservative traditional calculation, and the design load grade of the original bridge can reach "highway grade II". 2. Through the finite element analysis of the cross section effect of the upper and lower edge of the arch ribs, it is concluded that under the same conditions, the section effect of the lower edge is better than that of the upper edge. With the increase of the reinforcement thickness of the lower edge, the safety of the section increases, and when the thickness reaches a certain thickness, The original structure is destroyed before the new concrete plays a role, and the reasonable reinforcement thickness is the guarantee of the reinforcement effect. 3. The finite element model analyzes the bonding reinforcement technology, and it is concluded that with the increase of the thickness of the reinforced steel plate, the reinforcement effect is more obvious. When the full arch is strengthened, compared with other sections, the reinforcement effect of steel plate reinforcement on the middle span section is more obvious. Steel box arch reinforcement has great influence on structural stiffness and stress, but little effect on axial force and bending moment. 4. The finite element model is used to analyze the steel plate-carbon fiber cloth reinforcement method, and it is concluded that the reinforcement method is equivalent to turning the arch ribs into variable section arch, so that the advantages of steel plate and carbon fiber sheet can be brought into play, with the increase of the thickness of steel plate and carbon fiber cloth, The more obvious the reinforcement effect is, the less the influence of the thickness of lateral steel plate on the reinforcement effect is.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.72

【参考文献】