基于标准跨径的预弯组合简支梁桥的设计研究

发布时间：2018-08-12 15:26

【摘要】：预弯组合梁以其建筑高度小的优势逐渐得到桥梁工程师的重视,这种新型结构适用于城市立交以及高速公路跨线桥,在我国将有很好的发展前景。从上个世纪八十年代开始,我国就开始进行预弯组合梁的相关研究,取得了一些研究成果,并将其应用于实际工程。但由于国内缺少相关的规范、标准,该方面的推广目前处于停滞不前的状态。目前课题组已经在住建部完成立项,开始编制国家标准《预弯预应力组合梁桥设计施工规程》,以指导预弯组合梁桥的设计和施工。在推广预弯组合梁桥过程中,标准化设计也是其中的一个重要组成部分。本文主要进行了以下几方面的研究：1)以弹性设计方法为理论基础,从预弯组合梁桥在施工和使用过程中所处的不同状态出发,将预弯组合梁的计算截面进行分类,再根据不同的受力状态,分别给出了预弯钢梁、一期混凝土和二期混凝土的上、下翼缘的截面的应力以及各计算阶段跨中挠度的计算公式。2)对具有相同桥宽的10种标准跨径的预弯组合简支梁桥进行了尺寸拟定、优化,并按照确定的尺寸进行了分析和验算,确定了一套较为完整的标准化设计方案。3)对上述的标准化设计的各项参数进行归纳、整理和回归分析,找出各个参数之间的关系,使得预弯组合简支梁桥的设计不再局限于有限、离散的几种,扩大了设计的范围。本文给出的标准化设计突出体现了预弯组合梁的特点和优势,研究成果的针对性较强,对预弯组合梁桥的设计工作具有一定的指导意义和参考价值,为在我国进一步推广预弯组合梁桥奠定工作基础。
[Abstract]:Bridge engineers pay more and more attention to the prebending composite beam because of its small building height. This new structure is suitable for urban interchange and expressway bridge. It will have a good development prospect in China. Since the eighties of last century, our country began to carry on the related research of the prebending composite beam, obtained some research results, and applied it to the practical engineering. However, due to the lack of relevant norms and standards, the promotion of this aspect is at a standstill. At present, the project has been completed in the Ministry of living and Construction, and the National Standard "Design and Construction rules of Prebending Prestressed Composite girder Bridge" has been established to guide the design and construction of prebending composite girder bridge. In the process of popularizing prebending composite girder bridge, standardized design is also an important part. In this paper, the following aspects of the research: 1) based on the elastic design method, according to the different states of the prebending composite beam bridge in the construction and use process, the calculation section of the prebending composite beam is classified. According to the different stress states, the prebending steel beam, the first stage concrete and the second stage concrete are given respectively. The stress of the section of the lower flange and the calculation formula .2 of the midspan deflection of each stage) the size of 10 kinds of standard span preformed composite simply supported girder bridges with the same bridge width are drawn up, optimized, and analyzed and checked according to the determined dimensions. A complete set of standardized design scheme. 3) induces, arranges and regresses the parameters of the above standardized design, and finds out the relationship between the parameters. The design of prebending composite simply supported beam bridge is no longer limited to the limited and discrete ones, and the scope of design is enlarged. The standardized design presented in this paper highlights the characteristics and advantages of prebending composite beam, and the research results have strong pertinence, which has certain guiding significance and reference value for the design of prebending composite beam bridge. It lays the working foundation for further popularizing prebending composite girder bridge in our country.
【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】：U448.217

【相似文献】