结构工程
开裂
焊接
有限元法
失真(音乐)
桥(图论)
工程类
大梁
压力(语言学)
法律工程学
材料科学
复合材料
机械工程
电信
带宽(计算)
放大器
哲学
内科学
医学
语言学
作者
Mehdi Motaleb,Nick H. Duong,Will Lindquist,Riyadh Hindi
出处
期刊:Journal of Bridge Engineering
[American Society of Civil Engineers]
日期:2017-04-01
卷期号:22 (4)
被引量:1
标识
DOI:10.1061/(asce)be.1943-5592.0001023
摘要
This paper studies distortion-induced fatigue cracks in a 1960s-era welded plate girder bridge that developed cracks in the web-gap region shortly after completion of a comprehensive seismic retrofit. Finite-element analysis (FEA) and field testing were conducted to investigate the cause of cracking and then to recommend appropriate repair measures for the bridge. The field test results validated the high-stress concentrations in the web-gap region of the bridge that led to fatigue cracking after only a limited number of cycles. FEA results indicated that the high-stress concentrations were principally a result of replacing K-type diaphragms with stiffer cross diaphragms as part of the seismic retrofit. Two conventional repair measures in addition to two innovative repair measures were evaluated. The proposed innovative repair measures focused on ease of installation compared with more conventional options and were found to reduce the distortion-induced stresses well below the constant amplitude fatigue threshold (CAFT).
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