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Kou kouzou rombunshuu Vol. 9 (2002), No. 33

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. 9 (2002), No. 33

Development of High Heat Input Welding Technology For Architectural Steel Frame Structures

Tomoyuki HASHIDA, Shoichiro FCJHRA, Kazushi OHMSHI, Kazushige ARIMOCHI, Motohide TADA, Masao TOYODA

pp. 1-12

DOI:

10.11273/jssc1994.9.1

Abstract

The beam-to-column connections have conventionally been welded by a CO2 arc welding (CO2 method). With the special steel for large heat input, we have developed an electrogas arc welding (EGW) in its deposition rate of 3 times of CO2 method. The heat input in EGW is approximately 5 to 20 times as high as that in the CO2 method. But the charpy impact values in weld zone are not less than 100J(at 0°c) in case of the special steel. Moreover, we have confirmed EGW for applying it to beam-to-column connection with the full scale loading test. The specimens welded by EGW or CO2 method were tested. The ultimate states were fracture of base metal or local buckling after showing large deformation. As compared with test results of CO2 welding, it was confirmed that EGW has enough capability for the practical use.

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Development of High Heat Input Welding Technology For Architectural Steel Frame Structures

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Fatigue Strength of Flange Gusset Welded Joints Repaired by Bolting-Stop-Hole Method

Takeshi MORI, Ittetsu NISHIO, Daisuke UCHIDA

pp. 13-23

DOI:

10.11273/jssc1994.9.13

Abstract

In order to examine the fatigue strength of fatigue cracked flange gusset welded joints repaired by the bolting-stop-hole method, fatigue tests on as-welded joints and the joints repaired by the stop-hole or the bolting-stop-hole method, stress measuring tests and stress analyses using three-dimensional finite element method in consideration of plate thickness, hole diameter and crack length have been carried out. On the basis of the results, the numerical expression for estimating the fatigue strength has been proposed.

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Fatigue Strength of Flange Gusset Welded Joints Repaired by Bolting-Stop-Hole Method

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An Experimental Study on Elastic-Plastic Hysteretic Behavior of Tapered Box Columns

Minoru UENOYA, Masaki NAKAMURA, Yuhshi FUKUMOTO, Sadahiro YAMAMOTO

pp. 25-35

DOI:

10.11273/jssc1994.9.25

Abstract

This paper presents the experimental study on the hysteretic behavior of unstiffened 300×300mm square box columns with tapered plates under a specified axial compressive load with the cyclic horizontal loads at the column top. The ratios of the thickness at the both ends of the tapered plates are 12/12, 9/12, 7.5/12 and 6/12, respectively, between the length of 900mm. Larger yield penetrations are obtained depending on the various action and resistant moment ratios along the specimens. Maximum horizontal loads may be lowered linearly with the ratios of the thickness to the uniform column.

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An Experimental Study on Elastic-Plastic Hysteretic Behavior of Tapered Box Columns

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AN EXPERIMENTAL STUDY ON SHOCK ABSORBING EFFECT OF COLLISION BETWEEN TWO STEEL GIRDERS USING LAMINATED FIBER REINFORCED RUBBER

Yukihide KAJITA, Akira KANAMITSU, Yasushi NISHIMOTO, Nobutaka ISHIKAWA

pp. 37-47

DOI:

10.11273/jssc1994.9.37

Abstract

Studied herein is an experimental study on the collision between two steel girders using laminated fiber reinforced rubbers. The steel girder has 1000mm long, 200mm wide and 200mm high and the collision velocity ranges from 0.25m/sec to 2.00m/sec on 5 stages. In this experiment, a rubber or a few kinds of laminated fiber reinforced rubbers (LFRR) are equipped as a shock absorber and the energy absorption and the impact force during the collision are investigated. The following results are obtained from this study. The usual rubber and the LFRR are similar in the energy absorption during the collision however, the LFRR reduces the impact force better than the usual rubber when the laminated fibers break.

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AN EXPERIMENTAL STUDY ON SHOCK ABSORBING EFFECT OF COLLISION BETWEEN TWO STEEL GIRDERS USING LAMINATED FIBER REINFORCED RUBBER

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A Study on a Proportioning Method for Member Sections of Single Layer Reticulated Domes against Non-Uniform Loadings

Shiro KATO, Jong Min KIM

pp. 49-64

DOI:

10.11273/jssc1994.9.49

Abstract

The authors presented a proportioning method for member sections of single layer reticulated domes in the previous papers based on linear buckling stress obtained from linear buckling analysis. The method has been proved so efficient to size the members that the domes designed based on the method may satisfy the required ultimate loads under uniform load. The present paper investigates a proportioning method simultaneously considering dead weight and snow loads distributing non-uniformly. The result is verified through elasto-plastic simulation for roller supported single layer reticulated domes.

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A Study on a Proportioning Method for Member Sections of Single Layer Reticulated Domes against Non-Uniform Loadings

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A Study on Elastic Seismic Response and Estimation of Static Seismic Load of the Gable Trussed Structures

Shiro KATO, Shoji NAKAZAWA, Fumiko ATSUMI

pp. 65-80

DOI:

10.11273/jssc1994.9.65

Abstract

This paper studies the elastic seismic responses of a long span gable trussed structure and discusses two methods for estimating the static seismic loads. First, a set of seventy two trussed structures are designed using the four fundamental geometric parameters; span, height of the substructure, ratio of span to depth and ratio of rise to half-span. Then, for all of the structures, the eigen-value and earthquake response analyses are carried out. Based on the results, two methods of estimating the static seismic loads are proposed depending on the magnitude of equivalent modal weight. Finally, accuracy of the static forces is examined by comparing the estimated values with those obtained using direct dynamic analysis.

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A Study on Elastic Seismic Response and Estimation of Static Seismic Load of the Gable Trussed Structures

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Water-Proof and Rust Prevention Technique on Concrete filled I-beam grid slab (Ohmishima Bridge)

Kenji MURAKAMI

pp. 81-88

DOI:

10.11273/jssc1994.9.81

Abstract

The objective of the present paper is to demonstrate a waterproof and rust prevention technique on concrete filled I-beam grid slab (Ohmishima Bridge). Ohmishima Bridge is the first bridge constructed by the Honshu-Shikoku Bridge Authority to span the strait. Although the concrete filled I-beam grid slab of Ohmishima Bridge was covered with a water-proof layer on its upper surface, it has shown the leakage of water from its bottom surface since several years passed after the bridges had opened to the public. To cope with this, an investigation was carried out on the mechanism of water leakage and counterplan to prevent leakage from the paved surface. And the concrete filled I-beam grid slab was newly repaired by the waterproof and rust prevention method.

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Water-Proof and Rust Prevention Technique on Concrete filled I-beam grid slab (Ohmishima Bridge)

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Discussion on Elastic-Plastic Flexural Behavior of Welded Beam Web Joint between Rectangular Hollow Section Column and Wide Flange Section Beam

Kazuo INOUE, Keiichiro SUITA, Tsuyoshi TANAKA

pp. 89-97

DOI:

10.11273/jssc1994.9.89

Abstract

The authors conclude that the flexural strength of the welded web beam to square tube column joint is estimated from the equality hypothesis of plastic virtual work for the yield line mechanism. The discussors are of the opinion that the equality hypothesis of plastic virtual work proposed by the authors is not based on the theory of mechanics and the procedure to arrive the solution is incompatible with the limit analysis.

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Discussion on Elastic-Plastic Flexural Behavior of Welded Beam Web Joint between Rectangular Hollow Section Column and Wide Flange Section Beam

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Basic Concept of Analytical Model for Welded Beam Web Joint

Koji MORITA, Kazumasa EBATO

pp. 99-101

DOI:

10.11273/jssc1994.9.99

Abstract

The analytical model for connection strength of the welded beam web joint of RHS column-to-WF beam connection proposed by authors is based on the experimental strain distribution at the welded beam-web joint. The equation of virtual work proposed by discussers can not be applicable to this proposed analytical model, and the equality hypothesis of plastic virtual work is effective for the estimation of connection strength.

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Basic Concept of Analytical Model for Welded Beam Web Joint

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