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Measurement of Service Loading and Development of Monitoring System for Durability Evaluation of Highway Bridges due to Social and Economic Changes.

社会和经济变化引起的公路桥梁耐久性评估的服务负载测量和监测系统开发。

基本信息

批准号：
14350241
负责人：
YAMADA Kentaro
金额：
$ 4.03万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

(1) Measurement of Traffic Loading in Service and its Engineering ApplicationA Bridge Weigh-in-Motion system using signal corresponding to reaction force was developed, and it was applied to several bridge locations in major highway and expressways near Nagoya. Fatigue damage index based on Miner's cumulative damage rules was developed, and relative damages for different members of bridges caused by different truck types were evaluated. A new technique was also developed, where bridge vibration was simultaneously measured with axle load and vehicle weight to correlate them with traffic induced vibration.(2) Monitoring of Highway Bridges and Overhead Sign StructuresMonitoring of overhead sign structures and lighting poles was carried out from vibration viewpoint and stress cycles viewpoint in order to correlate vibration with fatigue durability. Visual monitoring and simple deflection meters were also applied to actual lighting poles in order to evaluate their vibration characteristics. Fatigue tests of base detail of such overhead sign structures were also carried out.(3) Development of Models for Evaluation of Fatigue Durability of Welded MembersFatigue tests were carried out for welded joint of unpainted weathering steel exposed to ambient air environment for about 25 years. So-called one-millimeter method, which used FEM analytical result, was developed to evaluate fatigue strength of complex welded detail. Low cycle fatigue tests was also carried out to develop evaluation model of steel in low cycle fatigue region, where image analysis was used to obtain large strain with relative accuracy.

(1)使用中交通荷载测量及其工程应用开发了一种利用反作用力信号的桥梁动态称重系统，并应用于名古屋附近的主要公路和高速公路的多个桥梁位置。建立了基于Miner累积损伤规则的疲劳损伤指数，评价了不同类型卡车对桥梁不同构件造成的相对损伤。还开发了一种新技术，即同时测量桥梁振动与轴荷和车辆重量，将其与交通引起的振动联系起来。(2)公路桥梁和高架标志结构的监测从振动角度和应力循环角度对高架标志结构和灯杆进行监测，以便将振动与疲劳耐久性联系起来。视觉监控和简单的挠度计也被应用于实际灯杆，以评估其振动特性。 (3)焊接构件疲劳耐久性评价模型的建立对暴露在周围空气环境中约25年的未涂漆耐候钢的焊接接头进行了疲劳试验。开发了所谓的一毫米方法，该方法使用有限元分析结果来评估复杂焊接细节的疲劳强度。还进行了低周疲劳试验，建立了钢材低周疲劳区的评价模型，利用图像分析获得相对准确的大应变。