增大截面法在火损桥梁加固中的应用研究

发布时间：2018-02-02 12:09

本文关键词： 火灾检测评定加固维修增大截面法　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：火灾对桥梁的损坏现象随着公路桥梁事业的蓬勃发展而呈上升趋势,一方面,火灾损坏会引起桥梁公共资产显著损失,另一方面,火灾对桥梁结构造成了损害,高温使得桥梁材料的化学物理性能减弱,从而造成桥梁的主要材料钢筋混凝土的强度和弹性模量等力学性能降低,混凝土和钢筋的粘结强度减弱,桥梁承载能力下降,最终影响了道路的安全运营。本文结合火灾桥梁工程案例,介绍了火损桥梁的现场调查检测技术和剩余承载能力的评估计算方法,以及维修加固方法。主要研究工作有：1、火损后桥梁结构的调查检测和损伤鉴定方法,包括火灾现场调查和结构检测技术。通过对燃烧物、燃烧时间和结构损伤外观的调查,推断火场最高温度和温度场分布,鉴定损伤等级,并通过结构检测,获得火损后桥梁结构和材料的技术性能,用于承载能力评估；2.火灾后桥梁结构的承载能力计算方法研究。通过承载能力计算方法的研究,计算出火灾后结构的剩余承载力,为进一步选择相应的修复加固方案提供基础数据；3、增大截面法的设计与施工方法研究。包括增大截面法的概念原理、特点、适用条件、构造要求、方案工艺设计以及最终加固效果验证等,确保增大截面加固法在该工程案例应用可靠有效。
[Abstract]:With the rapid development of highway and bridge, fire damage to bridges is on the rise. On the one hand, fire damage will cause significant loss of public assets of bridges, on the other hand, fire will cause damage to bridge structure. The chemical and physical properties of bridge materials are weakened by high temperature, which results in the decrease of mechanical properties such as the strength and elastic modulus of reinforced concrete, and the bond strength between concrete and steel bar. The reduction of bridge bearing capacity will ultimately affect the safe operation of road. This paper introduces the on-site investigation and detection technology of fire loss bridge and the evaluation and calculation method of residual bearing capacity combined with fire bridge engineering cases. And maintenance and reinforcement methods. The main research work is: 1, the bridge structure after fire damage investigation and damage identification methods, including fire site investigation and structural detection technology. The investigation of burning time and structural damage appearance infer the distribution of maximum temperature and temperature field of fire site identify the damage grade and obtain the technical performance of bridge structure and material after fire loss through structural detection. For carrying capacity assessment; 2. Research on the calculation method of the bearing capacity of the bridge structure after fire. Through the study of the calculation method of the bearing capacity, the residual bearing capacity of the structure after the fire is calculated. To provide basic data for further selection of corresponding restoration and reinforcement schemes; 3. Research on the design and construction method of the enlarged section method, including the concept principle, characteristics, applicable conditions, construction requirements, scheme process design and final reinforcement effect verification of the enlarged section method. To ensure that the reinforcement method of increasing section is reliable and effective in the case of this project.
【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】：U445.72

【相似文献】