钢筋混凝土桥梁的耐久性研究与评估-建筑与土木工程专业论文.docxVIP

中文摘要钢筋混凝土桥梁是应用非常广泛的一种桥梁结构形式。长期以来，由于“重 中文摘要 钢筋混凝土桥梁是应用非常广泛的一种桥梁结构形式。长期以来，由于“重 强度轻耐久”设计思想的影响，大量的钢筋混凝土结构在使用期内就出现了由 于耐久性失效而老化现象。钢筋混凝土结构的耐久性问题造成的负面影响和经 济损失，引起了越来越多的学者和工程技术人员的关注。耐久性问题由于越来 越突出，日益成为当前土木工程界的研究热点问题和迫切需要解决的问题。 论文在国内外有关研究的基础上，从环境、材料、构件和结构四个层次对 钢筋混凝土桥梁结构耐久性进行了进一步深入、系统地研究，主要包括以下几 个方面的内容； (1)在深入研究国内外有关j：献、资料的基础上，分析了影响桥梁耐久性 的因素，包括混凝土碳化、钢筋锈蚀、冻融破坏和盐碱侵蚀等。 (2)结合混凝土桥梁结构的特点，分析了钢筋混凝土桥梁结构耐久性损伤 机理及其对桥梁结构使用性能、受力性能(抗弯承载力、抗剪承载力)等的影 响。 (3)阐述裂缝及其宽度对钢筋混凝土桥梁结构耐久性的影响。 (4)以层次分析法为基础．采用A型隶属函数，建立了基于模糊数学的钢 筋混凝土桥梁上部结构耐久性指标评估模型，运用变权模糊综合评估法建立了基 于模糊数学的钢筋混凝土桥梁上部结构耐久性评估体系。 关键词：钢筋混凝土，桥梁，耐久性，评估 AbstractReinforced Abstract Reinforced concrete bridges are widely used in civil engineering．The deficiency of durability appears in lots of existing reinforced concrete bridges．It CRUSES many aging problems and has an ill effect on people’S productivity and life．It also brings people loss ofmoney．So more and more scholars and engineering technical staffpay attention to the problem．It has been a research hotspot in the civil engineering at the present time． Based on the durability ofreinforced concrete bridges and on the full analysis of research results OVCf the world，the paper makes a more deep·going and systemic study of the durability in four directions of surroundings,material，element and structure．The main contents are as foIlows： I．Based on the full analysis of research results over the world，the paper analyses the factors．Such嬲carbonization．chloride,erosion ofreinforcing-bar,etc． 2．Based on the characteristics ofreinforced concrete bridges,the paper analyses mechanism of durability and the influence of durability damage on the performance ofreinforced concrete bridges． 3．Researched the influence of crack Off the durability of reinforced concrete bridges． 4．Based on the analytic hierarchy process，it adopts the A·typc subordinate function to set up the durability index assessment model of the exiaing reinforced concrete bddge’S superstructure on the basis offuzzy mathematics． Key words：reinforced c