覆土式UHPC波折板拱桥力学性能分析
发布时间：2018-10-04 20:28
【摘要】：目前的中小跨径拱桥主要是钢筋混凝土拱桥或者圬工拱桥,在公路运输网中使用广泛,随着时间的推移这类结构都发生了不同程度的病害,传统实腹式拱桥的不足之处也逐渐的显现出来:施工繁琐、工期长,而且在使用的过程中会经常出现混凝土开裂、基础沉降等病害,尤其在地质不良和温度变化较大的地区更为明显,影响结构的正常使用和交通运输安全。因此寻找一种施工简单、承载力强、高耐久性的结构成为工程技术人员的重要任务。本文提出的覆土式UHPC波折板拱桥是将UHPC(Ultra-High-Performance Concrete超高性能混凝土)应用于实腹式拱桥中,该结构有着以下几方面的优势:(1)结构强度大,自重轻;(2)采用预制装配式施工,施工速度快;(3)对基础沉降和温度变化适应能力强。本文主要研究内容及成果如下:(1)对覆土式UHPC波折板拱桥进行设计,确定跨径、矢跨比、板厚度、填土高度等具体尺寸,并充分利用UHPC的优越性能,减小截面尺寸降低拱圈自重;(2)采用ANSYS对结构进行数值计算,分析结构在施工阶段和成桥阶段的结构受力变形情况,并对非对称填土进行模拟计算。结果表明:覆土式UHPC波折板拱桥可以满足施工和成桥阶段的受力要求,在施工过程中应该加强对结构的监控,避免非对称填土的不利影响;(3)对覆土式UHPC波折板拱桥进行基础变位、整体温度变化和弹性稳定性等力学性能分析,并探讨波折截面对于结构稳定性的影响。同时针对该拱桥结构的土-拱联合作用进行对比分析。结果表明:相比较传统实腹式拱桥,本结构对基础沉降和温度变化的适应能力都有较明显的提高,采用波折截面可以有效的提高结构的稳定性,在考虑土-拱作用的对比中可知由于土体围压和分散荷载的作用,结构的受力较均匀,变形也有所降低;(4)对结构进行参数分析,并进一步提出空腹式UHPC拱桥的构想,通过设置钢波纹管以减轻土体自重、提高结构的跨越能力,并对其可行性进行探讨。
[Abstract]:At present, the middle and small span arch bridges are mainly reinforced concrete arch bridges or masonry arch bridges, which are widely used in the highway transport network. The shortcomings of the traditional full-web arch bridge are also gradually revealed: the construction is cumbersome, the construction period is long, and in the process of use, there will often be concrete cracking, foundation settlement and other diseases. Especially in areas with poor geology and large temperature change, it affects the normal use of structure and transportation safety. Therefore, it is an important task for engineers to find a structure with simple construction, strong bearing capacity and high durability. In this paper, the earth-covered UHPC corrugated plate arch bridge is applied to the full-web arch bridge with UHPC (Ultra-High-Performance Concrete ultra-high performance concrete). The structure has the following advantages: (1) the structure has large strength and light weight, (2) prefabricated construction, (3) strong adaptability to foundation settlement and temperature change. The main contents and achievements of this paper are as follows: (1) the design of UHPC corrugated arch bridge with overlying soil is carried out to determine the specific dimensions, such as span, rise-to-span ratio, thickness of plate, height of fill, etc., and make full use of the superior performance of UHPC. (2) using ANSYS to calculate the structure, analyze the deformation of the structure in the construction stage and the bridge stage, and simulate the asymmetric fill. The results show that the soil-covered UHPC corrugated arch bridge can meet the stress requirements of the construction and the completion stage, and the monitoring of the structure should be strengthened during the construction process. To avoid the adverse effects of asymmetric fill; (3) to analyze the foundation displacement, temperature change and elastic stability of UHPC corrugated arch bridge with overlying soil, and to discuss the influence of the corrugated cross section on the stability of the structure. At the same time, the soil-arch combined action of the arch bridge structure is compared and analyzed. The results show that compared with the traditional full-web arch bridge, the adaptability of the structure to the foundation settlement and temperature change is obviously improved, and the stability of the structure can be effectively improved by using the zigzag section. Considering the soil-arch effect, it can be seen that due to the effect of soil confining pressure and scattered load, the stress of the structure is uniform and the deformation is reduced. (4) the parameter analysis of the structure is carried out, and the conception of the hollow UHPC arch bridge is put forward. Steel bellows are set up to reduce the weight of soil and to improve the crossing ability of the structure, and the feasibility of the corrugated pipe is discussed.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
本文编号：2251770
[Abstract]:At present, the middle and small span arch bridges are mainly reinforced concrete arch bridges or masonry arch bridges, which are widely used in the highway transport network. The shortcomings of the traditional full-web arch bridge are also gradually revealed: the construction is cumbersome, the construction period is long, and in the process of use, there will often be concrete cracking, foundation settlement and other diseases. Especially in areas with poor geology and large temperature change, it affects the normal use of structure and transportation safety. Therefore, it is an important task for engineers to find a structure with simple construction, strong bearing capacity and high durability. In this paper, the earth-covered UHPC corrugated plate arch bridge is applied to the full-web arch bridge with UHPC (Ultra-High-Performance Concrete ultra-high performance concrete). The structure has the following advantages: (1) the structure has large strength and light weight, (2) prefabricated construction, (3) strong adaptability to foundation settlement and temperature change. The main contents and achievements of this paper are as follows: (1) the design of UHPC corrugated arch bridge with overlying soil is carried out to determine the specific dimensions, such as span, rise-to-span ratio, thickness of plate, height of fill, etc., and make full use of the superior performance of UHPC. (2) using ANSYS to calculate the structure, analyze the deformation of the structure in the construction stage and the bridge stage, and simulate the asymmetric fill. The results show that the soil-covered UHPC corrugated arch bridge can meet the stress requirements of the construction and the completion stage, and the monitoring of the structure should be strengthened during the construction process. To avoid the adverse effects of asymmetric fill; (3) to analyze the foundation displacement, temperature change and elastic stability of UHPC corrugated arch bridge with overlying soil, and to discuss the influence of the corrugated cross section on the stability of the structure. At the same time, the soil-arch combined action of the arch bridge structure is compared and analyzed. The results show that compared with the traditional full-web arch bridge, the adaptability of the structure to the foundation settlement and temperature change is obviously improved, and the stability of the structure can be effectively improved by using the zigzag section. Considering the soil-arch effect, it can be seen that due to the effect of soil confining pressure and scattered load, the stress of the structure is uniform and the deformation is reduced. (4) the parameter analysis of the structure is carried out, and the conception of the hollow UHPC arch bridge is put forward. Steel bellows are set up to reduce the weight of soil and to improve the crossing ability of the structure, and the feasibility of the corrugated pipe is discussed.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441;U448.22
【引证文献】
相关硕士学位论文 前1条
1 朱增奇;9×66m上承式钢筋混凝土板拱桥施工技术研究[D];石家庄铁道大学;2017年
，本文编号：2251770
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