Repair strategies for fatigued highway bridges

疲劳公路桥梁的修复策略

• 批准号: 170424-2010
• 负责人: Grondin, Gilbert
• 金额: $ 1.6万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=452278
• 关键词: Repair; strategies; fatigued; highway; bridges

Many highway bridges currently in service in Canada were built in the 1950s when bridges were designed to permit lower demands than those permitted by current design standards (CSA-S16-06). This bridge population represents over 40% of the highway bridges across Canada and a significant portion of these bridges are structurally or functionally deficient, which means that they are in need of costly rehabilitation or replacement. These bridges are nearing the end of their design life and have been exposed to millions of load cycles from increasing volume and weight of truck traffic while exposed to harsh environments. It is estimated that roughly 12% of the 600,000 bridges in the USA are deficient and similar proportions of the Canadian bridges are expected to be in similar conditions or worst condition due to our severe climatic conditions over most of Canada. As a result, Canadian highways have hundreds of bridges exhibiting fatigue due to overload or environmental conditions, or some combination of these factors.

目前在加拿大服役的许多公路桥梁是在20世纪50年代建造的，当时桥梁的设计要求低于当前设计标准(CSA-S16-06)所允许的要求。这些桥梁占加拿大公路桥梁的40%以上，其中很大一部分桥梁在结构或功能上存在缺陷，这意味着它们需要昂贵的修复或更换。这些桥梁的设计寿命即将结束，暴露在恶劣环境中的卡车交通流量和重量不断增加，导致数百万次荷载循环。据估计，美国60万座桥梁中约有12%存在缺陷，由于加拿大大部分地区的严酷气候条件，预计类似比例的加拿大桥梁将处于类似或最差的状态。因此，加拿大高速公路有数百座桥梁因超载或环境条件或这些因素的某种组合而表现出疲劳。