螳螂江特大桥设计难点分析与受力特性研究

发布时间：2018-04-30 04:24

本文选题：连续梁桥 + 应力分析　；参考：《昆明理工大学》2015年硕士论文

【摘要】：连续梁桥是一种古老的桥型,具有跨径大,行车平顺等优点。随着预应力混凝土的出现,预应力混凝土连续梁桥具备了变形小,结构刚度好、行车平顺舒适,伸缩缝少,养护简易,抗震能力强等众多优点,被广泛应用于工程实践中。在铁路线路的建设中,铁路桥梁需要具备结构刚度大,抗扭刚度好,行车平顺性好的桥型,预应力混凝土连续梁桥往往从众多备选方案中脱颖而出。尤其是在悬臂、顶推等先进施工方法出现后,施工方法更加简单易行,施工速度也比以前大大缩短,这也提高了预应力混凝土连续梁桥在地质情况复杂地区的适应性,大大提高了竞争力。本文首先对连续梁及预应力混凝土的历史发展做了简要介绍,阐述了其在作为铁路桥梁的优势,并对国内外铁路连续梁桥的应用与发展进行了归纳与总结。并以安宁专用线螳螂江特大桥(孔跨6×32+(48+80+51.15)预应力混凝土连续梁+(51.15+80+48)预应力混凝土连续梁+1 x32m简支T梁,桥梁全长603.85m)为例,运用Midas Civil2011计算分析软件进行建模和数值分析,具体内容如下：1、介绍了螳螂江特大桥的工程背景,包括地址自然地理概况、地质情况等,同时根据上述资料确定了线路及桥梁各结构尺寸。2、采用大型通用有限元软件Midas Civil对全桥进行建模分析,对各参数进行取值,并模拟了施工的各个过程,通过对运营阶段、施工阶段以及截面强度等方面的应力检算,验证该桥在整体施工和运营方面的安全性；对主梁横向框架模型进行了细致分析,结果表明主梁横向框架结构顶板最大压应力、拉应力满足规范要求；腹板、底板抗裂性也可满足规范要求；结构受力安全可靠；根据有限元计算模型,进行结构动力特性分析,得出全桥的前十阶振型,根据计算结果可以看出桥横向刚度满足行车舒适性要求。3、对连续梁中受力最为复杂的主梁0#块段进行局部应力分析,运用MidasFEA软件建立了有限元模型,对0#块段顶板、底板及腹板等构件进行了验算。4、分别在多遇地震、罕遇地震作用下对桥梁下部进行抗震检算,并对支座强度进行验算,结果均能满足规范要求,并建议在支座设计时重视其水平承载能力的设计和采取相应的抗震措施。
[Abstract]:Continuous beam bridge is an ancient bridge type with the advantages of long span and smooth running. With the emergence of prestressed concrete, prestressed concrete continuous beam bridge has many advantages, such as small deformation, good structural stiffness, smooth driving, less expansion joints, easy maintenance, strong seismic capacity and so on, and has been widely used in engineering practice. In the construction of railway lines, railway bridges need bridge type with high structural stiffness, good torsional stiffness and good ride comfort. Prestressed concrete continuous beam bridges often stand out from many alternative schemes. Especially after the emergence of advanced construction methods such as cantilever and push, the construction method is simpler and easier, and the construction speed is much shorter than before, which also improves the adaptability of prestressed concrete continuous beam bridge in areas with complex geological conditions. Greatly improved competitiveness. In this paper, the historical development of continuous beam and prestressed concrete is introduced briefly, its advantages as railway bridge are expounded, and the application and development of railway continuous beam bridge at home and abroad are summarized and summarized. Taking the Mantis River Bridge of the Anning Special Line as an example, the prestressed concrete continuous beam is 1 x 32m simple supported T beam (the span of the hole is 6 脳 32 ~ 48,8051.15) and the bridge is 603.85m in length. Modeling and numerical analysis are carried out by using Midas Civil2011 calculation and analysis software. The concrete contents are as follows: 1. The engineering background of the Mantis River Bridge is introduced, including the natural geography of the address, geological conditions, etc. At the same time, according to the above data, the dimensions of each structure of the line and bridge are determined. The whole bridge is modeled and analyzed by using the large and universal finite element software Midas Civil, and the parameters are calculated, and the construction process is simulated. The safety of the bridge in the whole construction and operation is verified by checking the stress in the construction stage and section strength, and the model of the transverse frame of the main beam is analyzed in detail. The results show that the maximum compressive stress of the roof of the transverse frame structure of the main beam is obtained. The tensile stress can meet the requirements of the code, the web and the bottom plate can also meet the requirements of the code, the structure is safe and reliable, according to the finite element calculation model, the dynamic characteristics of the structure are analyzed, and the first ten vibration modes of the whole bridge are obtained. According to the calculation results, it can be seen that the lateral stiffness of the bridge meets the requirements of driving comfort. The local stress analysis of the 0# section of the main beam with the most complicated force in continuous beam is carried out. The finite element model is established by using MidasFEA software, and the roof of the block is analyzed. The bottom plate, web plate and other components are checked. 4. Under the action of frequent earthquake and rare earthquake, the lower part of the bridge is checked, and the strength of the support is checked. The results can meet the requirements of the code. It is suggested that attention should be paid to the design of the horizontal bearing capacity and the corresponding seismic measures should be taken in the design of the bearing.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U442.5

【参考文献】