کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
269334 504469 2008 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
A probabilistic assessment of the effect of post-weld treatment on the fatigue performance of tubular truss bridges
چکیده انگلیسی

In the design of tubular truss bridges, engineers have found the fatigue performance of the joints to be a critical aspect. In looking for ways to improve this performance, the use of residual stress-based post-weld treatments has been suggested. Although these treatments have been shown to increase the average fatigue lives of welded details under constant amplitude loading conditions in a number of studies, concerns exist regarding their reliability, in particular under realistic, variable amplitude loading conditions. With this in mind, the effect of post-weld treatment on the fatigue performance of tubular truss bridges is assessed herein using a previously developed probabilistic, fracture mechanics-based model, modified to analyze entire bridge structures under realistic, variable amplitude loading conditions. This model uses a systems reliability approach to consider the influences of the various potential crack sites on the overall reliability of the bridge. By analyzing several variants of a typical tubular truss bridge, it is shown that post-weld treatment can result in a significant fatigue performance improvement for this bridge type. This improvement is quantified herein in terms of either a savings in steel weight or an increase in fatigue life. Several additional studies examine the sensitivity of the results of this assessment to variations in the treatment coverage, intensity, and uniformity. These studies show that similar results can be obtained with a partial treatment strategy to those observed when the entire bridge is treated, and that the treatment benefit depends more on the intensity than the uniformity of the treatment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 30, Issue 1, January 2008, Pages 247–257
نویسندگان
, ,