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Fatigue Strength Improvement of U-type Trough Rib at Field Welded Joint in Steel Bridge Deck
최성민,Kazuo Tateishi,김인태,서원찬,이동욱 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.3
The influence of misalignment is investigated to improve the fatigue strength of U-type trough ribs at field welded joints in steel bridge decks. A 3-point bending fatigue test and finite element analysis were conducted on full-scale specimens. Small-scale specimens with a backing strip were also made and examined with a fatigue test and FEA to estimate the influence of misalignment. The result of the static loading test for the full-scale specimens showed that the position of maximum stress is in the bottom corners of the U-rib. It is known that fatigue cracks initiate from the inner surface of the U-rib and propagated to the outer surface, and larger misalignments contributed to a shorter fatigue life for the U-rib, based on the result of the fatigue test. The fatigue life is drastically reduced when the magnitude of misalignment is increased, as shown in the results of the fatigue test on small-scale specimens with a backing strip, and fatigue cracks usually occurred at the root of base metal. The result of stress analysis on small-scale specimens showed that the stress concentration at the root of base metal increases in proportion to larger misalignment, and the semicircular shape of the root is less subject to stress concentration than the right angle root type.
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김대혁(Dae-Hyeok Kim),한상윤(Sang-Yun Han),신성진(Sung-Jin Shin),강영종(Young-Jong Kang) 한국철도학회 2016 한국철도학회 학술발표대회논문집 Vol.2016 No.10
사용성 및 유지보수에 유리한 장점을 가지는 일체식 교량의 상부구조물을 효율적으로 설계하기 위하여 CFT Pile을 하부구조물에 적용하는 연구가 진행되었다. 본 연구는 하부구조물에 CFT Pile이 적용된 일체식 교량의 현장 적용을 위한 연구로써, 30m의 실물 실험체를 제작하여 정적 재하 실험을 수행하였으며, 재하 되는 하중에 따라 일체식 교량의 거동을 분석하여 구조물의 성능을 평가하였다. This study was carried out in order to economically design the upper structure of the integral bridge by applying the CFT pile to the lower part of the structure. The integral bridge has favorable usability and maintenance. A static loading experiment was conducted by making a full-scale specimen to study the CFT Pile on the lower part of the structure applied to the integral bridges. The behavior of the integral bridge structures and their performance was evaluated.
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Jinfeng Jiao,Xiao Ma,Honggang Lei,Y. Frank Chen 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
A test rig with multi-functional purposes was specifi cally designed and manufactured to study the behavior of multi-planar welded tubular joints subjected to multi-planar concurrent axial loading. An experimental investigation was conducted on full-scale welded tubular joints with each consisting of one chord and eight braces under monotonic loading conditions. Two pairs or four representative specimens (two specimens for each joint type) were tested, in which each pair was reinforced with two kinds of diff erent internal stiff eners at the intersections between the chords using welded rectangular hollow steel sections (RHSSs) and the braces using rolled circular hollow steel sections (CHSSs) and welded RHSSs. The eff ects of different internal stiff eners at the chord–brace intersection on the load capacity of joints under concurrent multi-planar axial compression/tension are discussed. The test results of joint strengths, failure modes, and load–stress curves are presented. Finite element analyses were performed to verify the experimental results. The study results show that the two diff erent joint types with the internal stiff eners at the chord–brace intersection under axial compression/tension signifi cantly increase the corresponding ultimate strength to far exceed the usual design strength. The load carrying capacity of welded tubular joints decreases with a higher degree of the manufacturing imperfection in individual braces at the tubular joints. Furthermore, the interaction eff ect of the concurrent axial loading applied at the welded tubular joint on member stress is apparent.
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