混合梁斜拉桥钢—混结合段受力行为与传力机理研究
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摘要
随着混合梁斜拉桥的建设实例不断增加及其跨度的不断突破,对其结合部位的研究也愈加受到重视。钢-混结合段设计是混合梁关键技术问题之一,其构造、应力分布和传力机理复杂,掌握其受力性能对保证结构的安全性和耐久性具有重要的工程实际意义。本文依托背景工程的钢-混结合段采用部分截面连接的承压传剪式,为了保证大桥施工和运营阶段的安全性,验证设计计算理论,确保结合段构造的可靠性和合理性,结合模型试验和有限元两种方法对其结合段进行了研究。论文的主要内容如下：
(1)对混合梁斜拉桥的发展和钢-混结合段的研究现状进行了概述,对本文课题背景和主要研究内容进行了介绍；
(2)在调研国内已开展钢-混结合段模型试验的基础上,依据模型设计相似理论,设计、制作了1：2的主梁钢-混结合段试验模型,确定了试验加载和测试方案；
(3)采用大型通用有限元软件建立了试验模型的有限元计算模型,根据静载试验和有限元分析结果,对结合段的应力分布情况、传力机理和承载能力等受力性能进行了分析,
(4)在总结、分析以往研究成果的基础上,对混合梁钢-混结合段的设计方法进行了探讨。
With the increasing numbers of hybrid girder cable-stayed bridges and the continuously breakthrough of their span, Thus the research of joint parts have been extensively investigated. As one of the critical design techniques of a hybrid girder, It has important realistic meanings to master the mechanical performance of the steel-concrete joint part for guaranteeing the safety and durability, owing to it's complex structure, uncertain force transfer mechanism and complicated stress distribution. The structural form of partial section connecting at steel-concrete interfaces with pressure-resistant and shear-transferred is taken in this background engineering. The joint part was studied by means of model test and finite element method, to ensure the safety of the bridge under the construction and operation stage, improve the design theory and ensure the rationality and reliability of the joint form. The main contents of this thesis as follows:
1. The development of hybrid girder cable-stayed bridges and the research status of the steel-concrete joint part were outlined, as well as the engineering background and the main research contents of this thesis were presented.
2. Based on the survey of the model tests which were already carried out in China, a model of the steel-concrete joint part of the main girder with a scale of1:2was designed and fabricated, also determined the loading and testing schemes.
3. Using the large-universal finite element software, the finite element calculating model of the steel-concrete joint part was established. The mechanical performance, such as the stress distribution, the force transfer mechanism and the load bearing capacity, was investigated by the results of static model tests and finite element method.
4. Discussed on the design method of the steel-concrete joint part on the basis of summarizing and analyzing the existing research results.
(1)对混合梁斜拉桥的发展和钢-混结合段的研究现状进行了概述,对本文课题背景和主要研究内容进行了介绍；
(2)在调研国内已开展钢-混结合段模型试验的基础上,依据模型设计相似理论,设计、制作了1：2的主梁钢-混结合段试验模型,确定了试验加载和测试方案；
(3)采用大型通用有限元软件建立了试验模型的有限元计算模型,根据静载试验和有限元分析结果,对结合段的应力分布情况、传力机理和承载能力等受力性能进行了分析,
(4)在总结、分析以往研究成果的基础上,对混合梁钢-混结合段的设计方法进行了探讨。
With the increasing numbers of hybrid girder cable-stayed bridges and the continuously breakthrough of their span, Thus the research of joint parts have been extensively investigated. As one of the critical design techniques of a hybrid girder, It has important realistic meanings to master the mechanical performance of the steel-concrete joint part for guaranteeing the safety and durability, owing to it's complex structure, uncertain force transfer mechanism and complicated stress distribution. The structural form of partial section connecting at steel-concrete interfaces with pressure-resistant and shear-transferred is taken in this background engineering. The joint part was studied by means of model test and finite element method, to ensure the safety of the bridge under the construction and operation stage, improve the design theory and ensure the rationality and reliability of the joint form. The main contents of this thesis as follows:
1. The development of hybrid girder cable-stayed bridges and the research status of the steel-concrete joint part were outlined, as well as the engineering background and the main research contents of this thesis were presented.
2. Based on the survey of the model tests which were already carried out in China, a model of the steel-concrete joint part of the main girder with a scale of1:2was designed and fabricated, also determined the loading and testing schemes.
3. Using the large-universal finite element software, the finite element calculating model of the steel-concrete joint part was established. The mechanical performance, such as the stress distribution, the force transfer mechanism and the load bearing capacity, was investigated by the results of static model tests and finite element method.
4. Discussed on the design method of the steel-concrete joint part on the basis of summarizing and analyzing the existing research results.
引文
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[20]项海帆.21世纪世界桥梁工程的展望[J].土木工程学报,2000(3)：1-6.
[21]金增洪.法国诺曼底大桥简介[J].外公路.1996(4)
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[23]肖林.钢混组合结构中剪力连接件试验研究[D].成都：西南交通大学,2008.
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[27]陶小兰,姚建军.斜拉桥钢混结合部位力学性能分析[J].公路交通技术,2011(3)
[28]周颖,徐资,段乃民.湛江海湾大桥钢-混凝土梁结合段受力分析[J].中外公路, 2006(5)：120-122.
[29]卢桂臣,邹宏华.混合式斜拉桥钢混接合段的优化研究[J].
[30]蒲怀仁.佛山平胜大桥钢混结合段设计[J].公路工程,2011(3)
[31]刘高,唐亮,谭皓,等.混合梁斜拉桥钢混结合部的合理位置[J].公路交通科技,2010(6)：
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[33]JTJ025-86.公路桥涵钢结构及木结构设计规范[S],1986.
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