波形钢腹板PC组合箱梁桥与PC连续箱梁桥的结构分析与经济比较

发布时间：2018-12-15 18:29

【摘要】：波形钢腹板PC组合箱梁是一种钢—预应力混凝土组合结构,具有重量较轻、预应力导入效率大、施工便捷、避免PC箱梁腹板斜裂缝、外形美观等优点。为进一步推动波形钢腹板PC组合箱梁结构在工程中的运用,本文通过对波形钢腹板PC组合箱梁桥和PC连续箱梁桥在结构内力、材料用量、施工效益、工程造价方面的对比分析,得出以下结论：1、波形钢腹板PC组合箱梁桥可以有效减轻结构自重,结构受力更为均匀。以本文计算桥梁为例,波形钢腹板PC组合箱梁桥结构自重和控制截面的弯矩幅值约为同等跨径PC连续箱梁桥的85%,且随着桥梁跨径的增大,这种降低的趋势更加明显。2、波形钢腹板PC组合箱梁桥可以减少混凝土和钢材用量。以本文计算桥梁为例,波形钢腹板PC组合箱梁桥上部结构混凝土用量约为PC连续箱梁桥的80%,钢材用量约为PC连续箱梁桥的90%；下部结构的桩基长度约为PC连续箱梁桥的90%,当桥梁跨径较大且工程地质条件较差时,减少基础工程量的优势会更加明显。3、波形钢腹板PC组合箱梁桥可以有效缩短施工工期。对于大跨径悬臂施工桥梁,不仅减少施工节段数量,而且单个施工节段时间仅为PC连续箱梁桥的80%左右；对于中等跨径等截面现浇桥梁,波形钢腹板由于制作工厂化,可以减少现场作业时间,有效缩短工期。4、波形钢腹板PC组合箱梁桥可以有效降低工程造价。以本文计算桥梁为例,波形钢腹板PC组合箱梁桥建安单价为6027元／平方米,PC连续箱梁桥建安单价为6441元／平方米,前者建安单价为后者的93.6%。通过本文分析可知,对于跨径120m及以上连续结构,波形钢腹板PC组合箱梁桥比PC连续箱梁桥具有经济优势。
[Abstract]:PC composite box girder with corrugated steel webs is a kind of steel-prestressed concrete composite structure, which has the advantages of light weight, large prestressing force transfer efficiency, convenient construction, avoiding oblique cracks of PC box girder web, and beautiful appearance. In order to further promote the application of PC composite box girder structure with corrugated steel web, this paper compares and analyzes the internal force, material consumption, construction benefit and project cost of PC composite box girder bridge with waveform steel web plate and PC continuous box girder bridge. The conclusions are as follows: 1. The PC composite box girder bridge with corrugated steel web can effectively reduce the weight of the structure and the force of the structure is more uniform. Taking the bridge calculated in this paper as an example, the structural weight and the bending moment amplitude of the control section of the PC composite box girder bridge with corrugated steel webs are about 85 parts of the same span PC continuous box girder bridge, and the decreasing trend is more obvious with the increase of the bridge span. Corrugated steel web PC composite box girder bridge can reduce the amount of concrete and steel. Taking the bridge calculated in this paper as an example, the amount of superstructure concrete of PC composite box girder bridge with corrugated steel web is about 80% of that of PC continuous box girder bridge, and the amount of steel used is about 90% of that of PC continuous box girder bridge. The pile foundation length of the substructure is about 90 of that of the PC continuous box girder bridge. When the span of the bridge is long and the engineering geological conditions are poor, the advantages of reducing the amount of foundation works will be more obvious. PC composite box girder bridge with corrugated steel web can effectively shorten the construction period. For long-span cantilever construction bridge, not only the number of construction segments is reduced, but also the time of single construction section is only about 80% of that of PC continuous box girder bridge. For the cast-in-situ bridge with medium span and equal section, the wavy steel web plate can reduce the working time and shorten the construction period because of the manufacture of steel web. 4. The PC composite box girder bridge with corrugated steel web can effectively reduce the project cost. Taking the bridge calculated in this paper as an example, the Jianan unit price of PC composite box girder bridge with corrugated steel webs is 6027 yuan / square meter, and that of PC continuous box girder bridge is 6441 yuan / square meter, and the former is 93.6 yuan per square meter of the latter. According to the analysis of this paper, the PC composite box girder bridge with corrugated steel webs has an economic advantage over the PC continuous box girder bridge for the continuous structure with span of 120m or more.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.21

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