一种高速铁路抢修梁的技术方案研究及其力学性能分析

发布时间：2018-01-02 22:17

本文关键词：一种高速铁路抢修梁的技术方案研究及其力学性能分析　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】：中国是目前世界上高铁运营里程最长、在建规模最大的国家。高铁列车对线路的平顺性和工后沉降要求很高,因而普遍采用以桥代路的建造方式,高铁线路中桥梁占很大比例。桥梁结构在战时易毁难修,在地震、滑坡、泥石流等自然灾害下亦可能发生损毁。高铁线路的断交将造成巨大的经济损失,但目前国内尚没有专门针对高铁桥梁的抢修技术和抢修器材储备,既有普通铁路桥梁抢修器材的技术战术性能指标又不能满足高铁桥梁抢修的需要。已经投入运营、数量巨大的高铁桥梁面临损毁后没有抢修技术支撑、没有抢修器材储备的窘境。因此,研究一种适应高铁桥梁抢修的梁部抢修结构是迫切的,并且具有重要的经济意义和社会效益。论文在回顾既有铁路抢修钢梁的基础上,提出了一种新型高铁抢修梁,并对其力学性能进行了分析研究,主要工作和结论如下:(1)研究提出了一种新的高铁桥梁梁部抢修技术方案。与传统的普通铁路桥梁抢修方法不同,新的抢修方案中用于临时抢修的梁部结构不再拆除,而是通过结构体系的转换,将临时抢修梁转变为永久桥梁结构,从而避免了对损毁桥梁的二次换架。(2)设计了适应新的抢修方案功能需求的高铁抢修梁。确定了抢修梁的结构形式,研究了抢修梁节段间的连接方式。通过采用钢销-剪力键的连接方式,并在抢修梁底板布置预应力筋,使抢修梁成为预应力钢结构,有效地提高了抢修梁的现场拼架速度,改善了临时抢修梁的竖向、横向刚度,较之普通铁路抢修钢梁可显著的提高临时通车速度。(3)研究了临时抢修梁向永久桥梁结构转换的技术方案。通过在抢修钢梁翼板上方逐线浇筑混凝土,布置并张拉体外预应力筋,形成预应力钢-混凝土组合梁。通过连接上下行线的单线抢修梁,布置并张拉横向预应力筋,使抢修梁形成双线整孔预应力组合梁。(4)临时通车状态单线抢修梁的力学性能分析结果表明,在高铁荷载作用下,抢修梁的强度、刚度、自振频率等符合《铁路桥涵设计基本规范》的要求。抢修梁节段间钢销-剪力键的连接方式由于腹板不能传递拉力,抢修梁的强度和刚度较同截面梁有所降低。纵向预应力筋的设置,可显著提高抢修梁的竖向刚度,降低梁体的总体应力水平。(5)正常运营状态双线永久梁部结构的力学性能分析结果表明,在高铁荷载作用下,永久梁部结构的强度、刚度、自振频率等符合《高速铁路设计规范》的要求,其整体性能和原有双线整孔预应力混凝土箱型梁相当。和单线临时抢修梁相比,双线永久梁的应力水平明显降低,竖向、横向刚度得到了显著提高。论文提出的高铁桥梁抢修技术方案,抢修速度快,临时通车速度较高,通过结构体系的转换可形成永久桥梁结构,避免了对损毁桥梁的二次换架,为我国高铁桥梁的抢修提供了一种器材储备和技术支撑,经济、社会效益显著。
[Abstract]:China is currently the world's longest high-speed rail operation mileage, the largest building in the country. Demanding settlement of high-speed trains of the track and after work, so it is generally used to build bridges instead of roads, high-speed rail lines in Liang Zhan. A large proportion of bridges in wartime to repair the damaged. The earthquake, landslides, landslides and other natural disasters may damage relations. The high-speed rail line will cause huge economic losses, but there is no specific high iron bridge repair technology and equipment repair reserves, both technical and tactical performance of ordinary railway bridge repair equipment can not meet the need of high speed railway bridges repair. Has been put into operation, a huge number of high-speed railway bridge face after damage repair technology no support, no repair equipment reserve dilemma. Therefore, research on an adaptation of high-speed railway bridge repair repair girder structure It is urgent, and has important economic and social benefits. The thesis is on the basis of railway emergency steel girder, proposes a new high-speed repair beam, and the mechanical properties were studied, the main work and conclusions are as follows: (1) this paper proposes a new high-speed rail bridge beam repair technology. Different from the traditional ordinary railway bridge repair method, beam structure for a temporary repair repair program in the new no longer removed, but through the transformation of the structure system, the temporary repair beam into a permanent bridge structure, so as to avoid the damage to the bridge for the two frame (2). Designed to meet the functional requirements of the new high speed rail repair scheme of repair beams. The repair beams, the repair connection girder segment between. Through the connection using a steel pin shear connector, and repair the bottom beam pre layout Stress reinforcement, repair the beam become prestressed steel structure, effectively improve the repair site erection of beam speed, improve the temporary repair girder vertical and lateral stiffness, compared with ordinary railway emergency steel girder can significantly improve the speed of temporary traffic. (3) of temporary repair to the technical scheme of permanent bridge beam conversion. Through the repair steel beam above the wing plate by line layout and pouring concrete, external prestressed tendons, the formation of prestressed steel-concrete composite beams. The single track down line connection repair beams are arranged and tensioned transversely prestressed bars, the repair beams forming double track prestressed composite beam (4) temporarily. Traffic state analysis of mechanical properties of the beam line repair showed that in high iron loading, repair beam strength, stiffness, vibration frequency in line with the "basic norms of railway bridge and Culvert Design > requirements. Repair girder sections between steel shear pin Key connection as the web can not transfer the tension, repair the beam strength and stiffness of beams decreased. Compared with longitudinal prestressed reinforcement settings, can significantly improve the repair beam vertical stiffness, reduce the overall beam stress level. (5) the mechanical properties analysis results of the normal operating state of permanent double beam structure that, in the high iron loading, permanent beam structure strength, stiffness, vibration frequency with high speed railway design specification > < requirements, the overall performance and the original double track prestressed concrete box girder. And single beam temporary repair compared to the vertical double beam permanent stress the level decreased significantly, the lateral stiffness has been significantly improved. The proposed high-speed rail bridge repair technology, repair speed, temporary traffic speed is higher, the formation of a permanent bridge structure through the conversion of the structure system, to avoid damage The two replacement of the bridge provides a kind of equipment reserve and technical support for the rush repair of the high speed railway bridge in China. The economic and social benefits are remarkable.

【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】：U445.7;U441

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