Study on Fatigue Cracking in Steel Bridge Piers With Box Section and Temporally Repairing

Morikawa, Hisashi; Shimozato, Tetsuhiro; Miki, Chitoshi; Ichikawa, Atsushi

doi:10.2208/jscej.2002.703_177

Cited by 18 publications

(6 citation statements)

References 2 publications

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“…It is observed that fatigue cracks occurred at beam-tocolumn connections of these frame piers [1], as shown like Figure 1. Causes of these fatigue cracks were experimentally investigated in previous studies [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 93%

Seismic Behavior of Fatigue-Retrofitted Steel Frame Piers

Kinoshita

2013

ced

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Fatigue retrofit works have been conducted on severely fatigue damaged beam-tocolumn connections of existing steel frame bridge piers in Japan. It is clear that retrofit works provides additional stiffness but the significance on the seismic behavior of steel frame piers is not clear. Since fatigue retrofit works have become prevalent, the effect of fatigue retrofit works on the seismic behavior of steel frame piers need to be understood. The objective of this study is therefore to investigate these effects of the retrofit work, especially installation of bolted splices, which is the most common technique. Elasto-plastic finite element earthquake response analyses were carried out. It is shown that the existence of bolted splices may increase seismic demand on the piers when plastic hinge zone is located on the beam. In addition, longer bolted splices using low yield strength steel are proposed to overcome this problem and are shown to give beneficial effects.

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Section: Introductionmentioning

confidence: 93%

Seismic Behavior of Fatigue-Retrofitted Steel Frame Piers

Kinoshita

2013

ced

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“…Many fatigue cracks were found in the beam-column connection of these frames [1][2][3]. Among the problems that are faced regarding the design and maintenance of steel frames, one is the development of such fatigue cracks.…”

Section: Introductionmentioning

confidence: 99%

“…Among the problems that are faced regarding the design and maintenance of steel frames, one is the development of such fatigue cracks. Different case studies and researches on the cause, mechanism and effect of fatigue cracks have been carried out [4][5][6][7][8][9]. Once the cracks are formed, they propagate and may lead to brittle fracture causing structural failure.…”

Section: Introductionmentioning

confidence: 99%

A study of the seismic effects on a portal frame having a hole at the beam-column connection

Ahmed

Sasaki

2012

Thin-Walled Structures

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This paper presents the results of the study on thin walled steel portal frames, which are used in Japan as basic structural frames for motorway viaducts. A serious problem found in many such frames is fatigue cracks developed at the beam to column connection. To act as a measure against the fatigue failure, in some cases a hole is provided at the beam -column connection of the frames. In this study, dynamic analysis using real earthquake data from 3 different earthquakes have been carried out to examine the influence of such a hole on the global behavior of the frame and also on the local buckling around the location of the hole.Non-linear, large displacement analysis was performed using the FEM program MSC.Marc. The hole radius has been varied and used as a parameter of study. The results showed significant effect of the hole on local buckling and global behavior, specifically when the radius of the hole was larger than 100 mm.

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“…However, in fact, many serious fatigue cracks are found in the steel bridges, mainly of the trunk expressways or viaducts in the urban areas [1] [2].…”

mentioning

confidence: 99%

“…In the structures such as shown in Fig.1, cracks due to fatigue are often observed at the beam-to-column connection. Miki, C. et al indicates that the fatigue cracks are developed by the high stress intensity and the existence of the unwelded zone in the beam-to-column connection [2]. Recently, in some steel box columns, to remove the unwelded zone and to prevent the development of the crack at the beam-to-column connection, a new idea is proposed by Sasaki et al that a hole (named as a "Large Core" or "LC") is arranged at the beam-tocolumn connection as illustrated in Fig.2 [3].…”

mentioning

confidence: 99%

Strength of a corner zone of a frame structure with a hole to prevent from the fatigue crack

Sasaki

2008

Thin-Walled Structures

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This paper deals with a thin-walled steel frame structure having shifted beams used as a pier of the motorway viaduct. Some steel box piers of the motorway viaduct are often faced to a serious problem of the crack due to the fatigue at the beam-to-column connection. To prevent from the development of the crack, sometimes, a hole is arranged at the connection of the beam and the column. Such a hole is certainly effective to the crack, however, in this case, the influence to the buckling strength is not considered. Thus, in the current paper, the buckling strength of the column with a hole at the connection of the beam is studied. The elasto-plastic large deflection FEM analysis is made on the column with the plate thickness and the radius of the hole as parameters. The results indicate that the hole shall decrease the strength of the column up to 9 % when the compression stress is arisen near the hole.

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Study on Fatigue Cracking in Steel Bridge Piers With Box Section and Temporally Repairing

Cited by 18 publications

References 2 publications

Seismic Behavior of Fatigue-Retrofitted Steel Frame Piers

Seismic Behavior of Fatigue-Retrofitted Steel Frame Piers

A study of the seismic effects on a portal frame having a hole at the beam-column connection

Strength of a corner zone of a frame structure with a hole to prevent from the fatigue crack

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