火灾后桥梁结构受损评价分析及加固方法研究

发布时间：2018-04-17 20:40

本文选题：混凝土桥梁 + 桥梁火灾　；参考：《西安科技大学》2017年硕士论文

【摘要】：混凝土桥梁以其施工方便、造价经济、养护方便、跨越能力强等优点而得到广泛应用,而近年来公路桥梁火灾事件频频发生,火灾时的高温作用能使组成桥梁的混凝土、普通钢筋以及预应力钢筋等受到损伤,同时又能使组成桥梁的各部件产生损伤。火灾不仅对混凝土桥梁自身造成极大损伤,而且严重影响交通运输的正常运营。火灾后必须对受损桥梁进行及时且合理科学的损伤评估,并制定合理的处置加固方法,以达到恢复结构承载能力、保证路网通畅的目的。本文以一座遭遇火灾的混凝土桥梁为背景,对火灾后混凝土桥梁结构受损评价分析方法及处置加固方法进行系统研究,主要研究如下:(1)在现有研究成果的基础上,从混凝土桥梁的组成材料角度出发,归类分析了混凝土、普通钢筋以及预应力钢筋在火灾时和火灾后的损伤特点,为过火混凝土桥梁的检测评估提供了依据。(2)在了解混凝土桥梁各组成材料损伤特点的基础上,提出了适用于过火桥梁结构的检测评估程序,并对过火背景桥各构件按照该程序进行一系列受损检测,验证了该检测评估方法和流程的可操作性,本文提出的过火桥梁损伤检测方案具有一定参考价值。(3)研究分析了过火桥梁的几种评价方法,针对现有研究不足,提出了过火混凝土桥梁结构性能的综合评价法,详细给出了其损伤评价过程,并成功应用于背景桥的损伤评估中。(4)研究了过火桥梁处置加固的基本原则以及火灾后桥梁各构件的主要加固方法,并讨论了各加固方法的适用性。最后提出了背景桥梁加固维修方案,并通过对加固后的背景桥进行理论分析计算验证了该方案安全可靠,为同类型桥梁的加固维修提供依据。
[Abstract]:Concrete bridges are widely used because of their advantages such as convenient construction, economical cost, convenient maintenance, strong span ability, etc. In recent years, the fire events of highway bridges occur frequently, and the high temperature effect of fire can make the concrete of the bridge.The common steel bar and the prestressed steel bar are damaged, and the components of the bridge can be damaged at the same time.The fire not only causes great damage to the concrete bridge itself, but also seriously affects the normal operation of transportation.The damage assessment of damaged bridges must be carried out in time and scientifically after the fire, and reasonable disposal and reinforcement methods should be worked out in order to restore the bearing capacity of the structure and ensure the smooth road network.In this paper, based on the background of a concrete bridge in fire, the methods of damage evaluation and strengthening of concrete bridge structure after fire are studied systematically. The main research is as follows: 1) based on the existing research results,From the point of view of the composition material of concrete bridge, the damage characteristics of concrete, ordinary steel bar and prestressed steel bar during and after fire are classified and analyzed.This paper provides a basis for the detection and evaluation of overfire concrete bridges. On the basis of understanding the damage characteristics of each component material of concrete bridges, this paper puts forward a detection and evaluation program suitable for overfire bridge structures.A series of damage detection was carried out according to the procedure to verify the maneuverability of the detection method and process.The damage detection scheme of overfire bridge proposed in this paper has certain reference value. Several evaluation methods of overfire bridge are studied and analyzed. Aiming at the deficiency of existing research, a comprehensive evaluation method of overfire concrete bridge structure performance is put forward.The damage assessment process is given in detail, and successfully applied to the damage assessment of the background bridge. The basic principles of overfire bridge disposal and reinforcement and the main reinforcement methods of the bridge members after fire are studied, and the applicability of each reinforcement method is discussed.Finally, the reinforcement and maintenance scheme of the background bridge is put forward, and the theoretical analysis and calculation of the strengthened background bridge are carried out to verify the safety and reliability of the scheme, which provides the basis for the reinforcement and maintenance of the same type of bridge.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.72;U441

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