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Kou kouzou rombunshuu Vol. 22 (2015), No. 86

ISIJ International
belloff
ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928
Publisher: Japanese Society of Steel Construction

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Kou kouzou rombunshuu Vol. 22 (2015), No. 86

EVALUATION FOR DEBONDING OF PATCH PLATE BONDED TO BUTTED STEEL PLATES

Masaru SHIMIZU, Toshiyuki ISHIKAWA, Hisakazu HORII, Atsushi HATTORI, Hirotaka KAWANO

pp. 86_1-86_11

DOI:

10.11273/jssc.22.86_1

Abstract

Recently, bonding patch plate is used for rehabilitation of steel structures deteriorated with corrosion or fatigue cracks. The patch plate tends to decreases the stress intensity factor at crack tip and delay the crack propagation. However, debonding of patch plates could occur around the end of patch plates and at fatigue crack edges. To evaluate debonding of patch plates bonded to the cracked steel plate, axial loading tests for butted steel joint with bonded patch plates were conducted. Furthermore, the shear and normal stresses in adhesive layer were analyzed. The debonding strength of the joint was evaluated from a view of principal stress in adhesive layer.

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EVALUATION FOR DEBONDING OF PATCH PLATE BONDED TO BUTTED STEEL PLATES

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Ris

COMPARISON OF THE VARIOUS DESIGN CODES ABOUT LATERAL BRACINGS

Iori KANAO, Takanori HERAI, Zheng YU

pp. 86_13-86_21

DOI:

10.11273/jssc.22.86_13

Abstract

In this paper, various design codes for lateral bracings are compared about beam strength, plastic deformation capacity, out-of-plane deformation and stiffening force. Maximum beam strength showed full plastic moment and the strength was maintained until beam end rotation angle 0.045 rad. Plastic deformation capacity R showed three or more. Out-of-plane deformation was almost within 150mm. However, stiffening force was large in long beam. In design code, required stiffening force is 2 to 3% of compression force of flange, but maximum stiffening force was 9%.

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COMPARISON OF THE VARIOUS DESIGN CODES ABOUT LATERAL BRACINGS

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Seismic behavior of isolated viaduct having knock-off type steel side blocks

Yasuyuki NAKANISHI, Masahide MATSUMURA, Takashi YAMAGUCHI

pp. 86_23-86_32

DOI:

10.11273/jssc.22.86_23

Abstract

The knock-off type steel side block, proposed by the authors, provides a displacement restraint against a small earthquake but has some technical problems to be solved for a wider application of it. In this study, an improved design equation on breaking load of the side block is proposed by referring to its failure mechanism. Also dynamic behavior of isolation bearings having the side block are grasped through shaking table test and seismic responses of viaduct with the bearings having the side blocks in the transverse direction of the bridge axis are investigated through seismic response analyses.

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Seismic behavior of isolated viaduct having knock-off type steel side blocks

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AN ANALYTICAL STUDY ON EFFECT OF LOADING TIP SHAPES ON FLEXURAL BEHAVIOR OF VACANT AND CONCRETE-FILLED STEEL TUBULAR MEMBERS SUBJECTED TO CONCENTRATED TRANSVERSE LOADS

Mahmud Kori EFFENDI, Hiromitsu KAWAGUCHI, Kosho MINAMI, Akihiko KAWANO

pp. 86_33-86_45

DOI:

10.11273/jssc.22.86_33

Abstract

Tsunami flotsam attacked many steel buildings in the 2011 off the Pacific coast of Tohoku Earthquake. Steel buildings construct popularly by using tubular columns. One of the difficulties to evaluate the strength of steel tubular member against the collision of Tsunami flotsam is local deformation caused by the collision, which degrades the overall strength. Furthermore, contact surface shape of collision object, for example, sharp or flat introduces variation of local deformation and the corresponding strength reduction. The filling concrete into tubular members (CFT) would be alternative to overcome the disadvantages. Therefore, we performed static FEM analysis by using the program MSC Marc. The collision by Tsunami flotsam categorizes as the low velocity collision, so that the static analysis may be applicable to investigate the above topics. We discuss that the overall strength degradation by local deformation and the effect of loading tip shapes for vacant steel tubular members and CFT members.

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AN ANALYTICAL STUDY ON EFFECT OF LOADING TIP SHAPES ON FLEXURAL BEHAVIOR OF VACANT AND CONCRETE-FILLED STEEL TUBULAR MEMBERS SUBJECTED TO CONCENTRATED TRANSVERSE LOADS

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ANALYTICAL STUDY ON CRITICAL RADIUS-THICKNESS RATIO FOR STABLE HYSTERISYS OF LATTISE DAMPING WALL SYSTEM WITH TORSIONL STEEL TUBE

Takuya SUZUKI, Kenji YAMAZAKI

pp. 86_47-86_55

DOI:

10.11273/jssc.22.86_47

Abstract

In this paper, a new type damping wall system using torsional steel tube damper is proposed. This proposed system has a feature that we can set the stiffness and yielding strength freely. And we can set any opening for doors or windows where designers want. For the proposed system has stable hysteretic energy absorption, it is important that steel tube damper shows stable hysteresis. But it is known that with large radios-thickness ratio, steel tube damper has small energy absorption ability. So, in this paper, the critical radios-thickness ratio of torsional steel tube damper for large energy absorption is confirmed by FE analysis.

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ANALYTICAL STUDY ON CRITICAL RADIUS-THICKNESS RATIO FOR STABLE HYSTERISYS OF LATTISE DAMPING WALL SYSTEM WITH TORSIONL STEEL TUBE

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Analytical study for stress concentration factor of in-plane gusset plates with circular transitions

Shogo KIYOKAWA, Kouji KINOSHITA, Daisuke UCHIDA

pp. 86_57-86_66

DOI:

10.11273/jssc.22.86_57

Abstract

Stress concentration factor of in-plane welded gusset joints with circular transitions is examined analytically. The focus is on the influence of the geometry, which is defined by parameters such as the flange width D, the transition radius r and the gusset plate length L. Parameter study results show that the effect of D and r are significant, but the effects become less and less with increasing D. Based on the results, a stress concentration factor equation is proposed for covering larger D. The proposed equation has better agreement with FEM results compared to the conventional equation, when D becomes large.

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Analytical study for stress concentration factor of in-plane gusset plates with circular transitions

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