多跨连续刚构桥主墩静力分析及合龙方案研究
发布时间：2018-11-26 19:00
【摘要】：多跨、大联长预应力混凝土连续刚构桥不仅适应了高等级公路较高的路线指标、各种复杂的地形地质条件，而且保持了行车舒适、稳定定好、跨越能力强、施工技术成熟、造价经济等优点。因此跨径在100~200m范围，与其他桥型相比优势较为明显。但随着联长与跨数的增加，边墩处于极为不利的受力状态，且不同的合龙方式对结构受力及工期均有一定影响，因此多跨连续刚构桥的合龙方案及改善边墩受力状态的工程措施研究显得尤为重要。 本文以延安至延川高速公路上跨越黄河的连续刚构桥为依托，分析研究多跨大联长连续刚构桥的桥墩设计验算及主梁合龙方案，主要研究内容和成果有： 1.依据依托工程，建立该桥各阶段模型，计算分析上下部结构受力状况，得出桥墩截面型式及尺寸选择的方法。 2.分析研究了影响桥墩受力的各种因素，得出不同位置墩身设计的控制因素。 3.讨论改善多跨连续刚构桥边墩受力的构造及施工措施，研究确定合龙顶推力与顶推位移的关系，得出确定顶推力大小的方法。 4.针对黄河特大桥，，提出采用边、中跨次边跨的合龙顺序要优于边跨次边跨 中跨及中跨次边跨边跨，此顺序更有利于次边跨与中跨合龙之前的顶推，且边、中跨同时合龙可缩短工期。
[Abstract]:Multi-span, large-span prestressed concrete continuous rigid frame bridge not only adapts to the higher route index of high-grade highway, various complicated terrain and geological conditions, but also maintains comfortable driving, stable determination, strong span ability and mature construction technology. Cost economy and other advantages. Therefore, the span is in the range of 100 ~ 200 m, compared with other bridge type, the advantage is obvious. However, with the increase of joint length and span number, the side pier is in an extremely unfavorable stress state, and the different closing modes have certain influence on the stress of the structure and the duration of the project. Therefore, it is very important to study the closed scheme of multi-span continuous rigid frame bridge and the engineering measures to improve the stress state of side pier. Based on the continuous rigid frame bridge across the Yellow River on the Yanan-Yanchuan Expressway, this paper analyzes and studies the design and calculation of the piers of the multi-span long-span continuous rigid frame bridge and the scheme of closing the main beam. The main research contents and results are as follows: 1. According to the supporting project, the model of each stage of the bridge is established, and the stress condition of the upper and lower parts of the bridge is calculated and analyzed, and the method of selecting the section type and the size of the pier is obtained. 2. The factors influencing the force of pier are analyzed and studied, and the control factors of pier design in different positions are obtained. 3. This paper discusses the construction and construction measures to improve the force on the side pier of multi-span continuous rigid frame bridge, studies the relationship between the top thrust of the closure and the displacement of the thrust, and obtains the method of determining the force of the top thrust. 4. In view of the Yellow River bridge, it is suggested that the closing sequence of edge, middle span and middle span is better than that of side span, middle span and middle span, and this order is more favorable to the pushing of secondary span and middle span before closing dragon, and the side is better than that of side span, middle span and middle span, and this order is more favorable to the pushing of secondary span and middle span. Closing the middle span at the same time can shorten the duration of the project.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
本文编号：2359355
[Abstract]:Multi-span, large-span prestressed concrete continuous rigid frame bridge not only adapts to the higher route index of high-grade highway, various complicated terrain and geological conditions, but also maintains comfortable driving, stable determination, strong span ability and mature construction technology. Cost economy and other advantages. Therefore, the span is in the range of 100 ~ 200 m, compared with other bridge type, the advantage is obvious. However, with the increase of joint length and span number, the side pier is in an extremely unfavorable stress state, and the different closing modes have certain influence on the stress of the structure and the duration of the project. Therefore, it is very important to study the closed scheme of multi-span continuous rigid frame bridge and the engineering measures to improve the stress state of side pier. Based on the continuous rigid frame bridge across the Yellow River on the Yanan-Yanchuan Expressway, this paper analyzes and studies the design and calculation of the piers of the multi-span long-span continuous rigid frame bridge and the scheme of closing the main beam. The main research contents and results are as follows: 1. According to the supporting project, the model of each stage of the bridge is established, and the stress condition of the upper and lower parts of the bridge is calculated and analyzed, and the method of selecting the section type and the size of the pier is obtained. 2. The factors influencing the force of pier are analyzed and studied, and the control factors of pier design in different positions are obtained. 3. This paper discusses the construction and construction measures to improve the force on the side pier of multi-span continuous rigid frame bridge, studies the relationship between the top thrust of the closure and the displacement of the thrust, and obtains the method of determining the force of the top thrust. 4. In view of the Yellow River bridge, it is suggested that the closing sequence of edge, middle span and middle span is better than that of side span, middle span and middle span, and this order is more favorable to the pushing of secondary span and middle span before closing dragon, and the side is better than that of side span, middle span and middle span, and this order is more favorable to the pushing of secondary span and middle span. Closing the middle span at the same time can shorten the duration of the project.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4
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