简支体系转预应力连续体系加固旧桥研究

发布时间：2018-07-10 12:16

本文选题：简支转连续 + 旧桥加固　；参考：《大连理工大学》2015年硕士论文

【摘要】：钢筋混凝土桥梁结构随着时间发展会出现老化和损伤,而且加之桥梁结构的使用频率、承受荷载都随着经济和社会的发展而增加,从而引起桥梁的耐久性降低和承载力不足,这些原因使得我国已经出现了大量的旧桥或危桥。这些已经存在的旧桥或危桥,如若不妥善处理,将会阻碍经济发展和甚至威胁人类的生命财产安全。但如果将这些桥梁拆除重建将耗费大量的财力人力,造成很大的浪费并增加社会负担。于是,桥梁加固越来越成为工程技术人员重视的课题。简支转连续加固旧桥是常用的桥梁上部结构加固方法之一。根据连续方式的不同,简支转连续加固旧桥又可以分为多种形式,其中简支转预应力连续加固效果最优。本文以京哈线某大桥简支转预应力连续加固为例,开展这一体系转换加固方法的研究,主要包括两个部分,一是借助桥梁结构分析软件Dr.Bridge进行模拟计算分析,二是根据荷载试验结果进行数据处理分析。具体内容介绍如下：1利用专业有限元软件Dr.Bridge对结构加固前后分别进行承载能力验算,验算过程中参考《公路桥涵设计通用规范》(JTG D60—2004)和《公路钢筋混凝土及预应力混凝土桥涵设计规范》(JTG D62—2004)。在模型运算结果中一方面验算其是否满足规范要求,另一方面分别提取关键截面的恒载和活载效应加以对比分析。结果表明结构加固前不能够满足规范要求,不能保证结构有足够的可靠度。但在体系转换加固后能够完全满足规范要求,且结构安全储备充分。此外,本文还从运算结果中提取结构加固前后关键截面的弯矩和剪力设计值进行对比分析,结果发现结构加固后弯矩设计值减小,剪力设计值增加,这是墩顶采用预应力连续后结构内力重分配的结果。2该桥加固前后各自做了详细的荷载试验。本文对两次荷载试验的数据进行处理和分析,数据内容主要包括结构恒载挠度、试验荷载挠度和试验荷载下的应力应变。试验结果表明,结构加固后,其刚度和稳定性都明显增加,试验荷载的挠度效应和应力应变效应都显著减小,再一次证明了该种加固方式的优越性。
[Abstract]:Reinforced concrete bridge structure will appear aging and damage with the development of time. Moreover, the use frequency of bridge structure and bearing load will increase with the development of economy and society, which will lead to the reduction of durability and insufficient bearing capacity of bridge. These reasons have led to the emergence of a large number of old or dangerous bridges. These existing old or dangerous bridges, if not properly handled, will hinder economic development and even threaten the safety of human life and property. But if these bridges are demolished and rebuilt, they will cost a lot of money and manpower, cause great waste and increase the burden of society. As a result, bridge reinforcement has become a more and more important subject for engineers and technicians. It is one of the commonly used methods to strengthen the superstructure of the old bridge. According to the difference of continuous mode, simply supported transfer continuous reinforcement of old bridge can be divided into a variety of forms, among which simply supported transfer prestressed continuous reinforcement effect is the best. In this paper, the study of the system transfer reinforcement method is carried out with the example of continuous prestressed reinforcement of a bridge on the Beijing-Harbin Route, which includes two parts: one is to carry out the simulation calculation and analysis with the help of the bridge structure analysis software Dr.Bridge. Second, the data processing and analysis are carried out according to the load test results. The specific contents are as follows: 1. The special finite element software Dr.Bridge is used to check the bearing capacity of the structure before and after reinforcement. In the course of checking calculation, we refer to the General Design Code for Highway Bridges and culverts (JTG D60-2004) and the Design Code for Highway reinforced concrete and Prestressed concrete Bridges and culverts (JTG D62-2004). In the model operation results, on the one hand, it checks whether it meets the requirements of the specification, on the other hand, it extracts the dead load and live load effect of the key section to compare and analyze respectively. The results show that the structure can not meet the requirements of the code before reinforcement, and can not guarantee the reliability of the structure. But after system conversion and reinforcement, it can completely meet the requirements of the code, and the structural safety reserve is sufficient. In addition, the moment and shear design value of the key section before and after reinforcement are extracted from the calculation results for comparative analysis. The results show that the design value of bending moment decreases and the design value of shear force increases after reinforcement. This is the result of the redistribution of the internal force of the bridge after the prestressed continuous structure is adopted at the top of the pier .2 the bridge is subjected to detailed load tests before and after reinforcement. In this paper, the data of two load tests are processed and analyzed. The data mainly include the deflection of dead load, the deflection of test load and the stress and strain under test load. The experimental results show that the stiffness and stability of the structure are obviously increased, and the deflection effect and stress-strain effect of the test load are significantly reduced after reinforcement, which proves the superiority of this reinforcement method again.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.72

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