大跨径连续刚构桥在活载单项作用下的预警级别  

Warning Level of Large-Span Continuous Rigid Frame Bridge in Single Live Load

作　　者：吴海军[1] 李俊[1] 黄友帮 王庆珍 岳顺 

机构地区：[1]重庆交通大学土木建筑学院,重庆400074 [2]重庆市公路局,重庆401147

出　　处：《重庆交通大学学报（自然科学版）》2014年第5期29-31,115,共4页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(50608072);山区桥梁与隧道工程国家重点实验室培育基地科技项目(CQSLBF-Y12-52CQSLBF-Y14-12)

摘　　要：分析了基于活载响应进行桥梁安全状态判断方法的现状,提出以活载单项作用下结构应力响应进行桥梁结构运营状态判断和预警的思路。基于不同活载效应对应的可靠度含义,提出了以设计活载标准值、频遇值及准永久值效应作为活载单项作用预警判断阀值。分析了江津长江大桥实测活载单项作用下应力分布的特点,应用活载单项作用下应力预警值的计算原理得到了其预警阀值,并评估了桥梁实际单项活载效应下的预警级别。The status quo that the bridge security state was determined by the live load response was analyzed, and the idea that the operational state determining and warning of bridge structure were carried out by structure stress response in single live load was proposed. Based on the reliability corresponding with different live load effects, the idea that the live load standard values, frequent values and quasi-permanent values were designed as the live load threshold values of warning and judging was proposed. The stress distribution characteristics of Jiangjin Yangtze River Bridge in actual single live load were analyzed, and the warning threshold values were obtained by the calculation principle of the stress warning value in single live load, and the actual warning level of bridge in single live load was assessed.

关 键 词：桥梁工程 连续刚构桥 活载单项作用 可靠度 预警级别 

分 类 号：U448.231[建筑科学—桥梁与隧道工程]