多跨预应力混凝土连续梁桥合龙参数对成桥状态的影响分析

发布时间：2018-01-18 01:32

本文关键词：多跨预应力混凝土连续梁桥合龙参数对成桥状态的影响分析　出处：《石家庄铁道大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着大位移支座和大变形伸缩缝的开发及使用,预应力混凝土连续梁桥开始向多跨、长联的方向发展。由于跨径的增长和跨数的增多,多跨预应力连续梁桥成桥状态控制也越来越困难。合龙过程作为预应力混凝土连续梁桥施工的最关键环节,对于最终的成桥状态有着非常大的影响。因此,研究合龙顺序与合龙温度等参数对多跨预应力混凝土连续梁桥成桥状态的影响是很有必要的。论文以东明黄河大桥为背景,主要内容如下:(1)在查阅大量相关文献的基础上,总结了对多跨预应力连续梁桥成桥状态影响较大的合龙参数。(2)使用桥梁有限元软件MIDAS/Civil 2012建立了11种不同合龙顺序和3种合龙温度下的模型。(3)通过对比成桥后主梁上、下缘应力,发现合龙顺序对成桥后主梁应力大小和分布规律均影响不大;通过对比成桥后的线形,发现成桥线形受合龙顺序的影响很大,综合考虑施工难度及工期等因素,选出了较合理的合龙顺序方案;通过对比个别方案的成桥线形,得出了一些关于合龙顺序对成桥线形影响的规律。(4)通过对比分析成桥后受年温度变化影响而产生的支座纵向位移,确定了最佳合龙温度,并从减小产生的桥墩偏心弯矩的角度出发,说明了合龙温度的选取原则。采用论文中比选所得的合龙顺序和合龙温度,能够保证最终的成桥主梁线形和应力分布合理,工期短,成桥后受年温度影响而产生的支座最大纵向位移较小,有效降低桥墩可能产生的偏心弯矩。分析得出的有关合龙顺序和合龙温度的规律对同类桥梁的施工具有一定参考价值。
[Abstract]:With the development and use of large displacement supports and large deformation expansion joints, prestressed concrete continuous beam bridges begin to develop in the direction of multi-span and long-link. It is also more and more difficult to control the state of multi-span prestressed continuous beam bridge. As the key link of prestressed concrete continuous beam bridge construction, the closing process has a great impact on the final state of the bridge. It is necessary to study the influence of parameters such as closure sequence and closure temperature on the state of multi-span prestressed concrete continuous beam bridge. The main contents are as follows: 1) on the basis of consulting a large number of relevant literature. The closure parameter of multi-span prestressed continuous beam bridge which has a great influence on the state of the bridge is summarized. The bridge finite element software MIDAS/Civil 2012 was used to establish 11 models of different closure sequences and 3 different closure temperatures. The model was compared to the main beam at the back of the bridge. It is found that the sequence of closure has little effect on the stress size and distribution of the main girder after completion of the bridge. By comparing the alignment of the bridge, it is found that the alignment of the bridge is greatly affected by the closure sequence. Considering the construction difficulty and time limit, a more reasonable closure sequence scheme is selected. By comparing the bridge alignment of individual schemes, some laws about the influence of closure sequence on the bridge alignment are obtained. The longitudinal displacement of the bearing is analyzed by comparing and analyzing the influence of the annual temperature change after the completion of the bridge. The optimal closure temperature is determined and the selection principle of closure temperature is explained from the angle of reducing the eccentric bending moment of bridge pier. It can ensure that the final bridge girder linear and stress distribution is reasonable, the time limit is short, and the maximum longitudinal displacement caused by the influence of annual temperature after the completion of the bridge is relatively small. The analysis of the order of closure and the temperature of closure has certain reference value for the construction of similar bridges.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.4

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