摘要
采用动态称重技术,对崾岘大桥进行了35 d的交通荷载监测,研究了车辆荷载对混凝土桥梁疲劳寿命的影响;利用声发射技术,进行了连续16 d的在线监测,并通过对典型位置的数据信号统计给出了该桥的工作状态;通过21 d的疲劳应力监测,采用S-N曲线和线性累积损伤理论计算受拉主筋寿命为1 239 a;依据断裂力学评估模型估算的疲劳寿命约为245 a。研究表明:荷载监测、疲劳应力监测、声发射监测和疲劳寿命评估技术的融合应用,可更为全面地评估既有混凝土梁桥的使用安全。
Weigh-in-motion( WIM) system was used to monitor Yaoxian bridge for 35 days and the influence of traffic load on the fatigue life of concrete girder bridge was also studied. Acoustic emission( AE) technique was adopted to monitor this concrete bridge continuously for 16 days,and through the amplitude distribution of 3 typical areas,the performance of the bridge was evaluated. According to recorded strain data,the estimated fatigue life was 1,239 years based on S-N curve assessment approach and 21 d fatigue strain monitoring; by using fatigue failure mechanism for fatigue life evaluation of the model,the result was 245 years. The results show that the technology fusion of traffic load monitoring,dynamic strain monitoring,AE monitoring and fatigue life evaluation technique can evaluate service safety of concrete girder bridges comprehensively.
出处
《重庆交通大学学报（自然科学版）》
CAS
北大核心
2013年第6期1128-1132,共5页
Journal of Chongqing Jiaotong University(Natural Science)
基金
高等学校全国优秀博士学位论文作者资助项目(2007B49)
中央高校基本科研业务费专项资金资助项目(CHD2012ZD008)
交通运输部西部交通建设科技项目(20113185191410)
关键词
混凝土梁桥
动态称重
声发射
疲劳寿命
疲劳安全监测
concrete girder bridges
weigh-in-motion
acoustic emission
fatigue life
fatigue safety monitoring
