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Kou kouzou rombunshuu Vol. 14 (2007), No. 54

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

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Kou kouzou rombunshuu Vol. 14 (2007), No. 54

A loading test on the slab bridge composed of steel square tubes using the real scale structure

Masahide TAKAGI, Koji HOMMA, Nobuhiro GOTO

pp. 1-15

DOI:

10.11273/jssc1994.14.54_1

Abstract

For rationalizing construction procedures of short span bridges, a slab bridge composed of steel square tubes was proposed. Clarifying load transfer performance and load carrying capacity of the slab structure, loading test using a real scale structure was conducted. As the result of the test, it was confirmed that the proposed slab structure has sufficient load distribution performance and load carrying capacity.

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A loading test on the slab bridge composed of steel square tubes using the real scale structure

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An evaluation of Elasto-plastic Characteristics of Beam-to-Column Connection under Biaxial Lateral Force and Compressive Axial Load

Weining SUI, Minoru YAMANARI

pp. 17-25

DOI:

10.11273/jssc1994.14.54_17

Abstract

It is well known that local deformation in a steel beam-to-column connection occurs by beam flange force. In this paper, a numerical study was conducted to get important information on elasto-plastic behaviour of connections stiffened by external diaphragm using a finite element analysis program. The connections are made of circular columns and wide flange beams, connected with external diaphragms under both axial load in column and lateral force. In order to simplify the expression of P-Delta relationship of the subassemlage with bilinear model, the properties of the connections were deduced by the analytical results of 32 subassemlages, which are the value of the initial stiffness, the secondary stiffness, the yield load and the ultimate load. Finally, it was shown that the estimated relationship of P-Delta is able to trace the analysis result very well.

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An evaluation of Elasto-plastic Characteristics of Beam-to-Column Connection under Biaxial Lateral Force and Compressive Axial Load

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Comparison of Design Formula For Buckling of Cylindrical Steel Shells under Axial Compression

Eka SATRIA, Shiro KATO, Yun-Beom KIM, Shoji NAKAZAWA

pp. 27-41

DOI:

10.11273/jssc1994.14.54_27

Abstract

This paper mainly focuses on design method for buckling of a moderate thin cylindrical shell under axial compression, usually used in civil engineering fields, but not for storage or container purposes. Technically, all the dimensions are limited by a ratio of radius to thickness, RIt, between 25 and 500. Several well known design codes, such as ECCS 1988, DIN 18800/4, ENV 1993-1-6 (Eurocode3) and IASS Design Formula, are compared based on analytical results. Using the numerical approach based on elasto-plastic buckling analysis, the design parameters under various dimensions and imperfections are determined, and then the practical guidance in designing cylindrical shells is proposed, but limited only under axial compression, using those standard codes formula. Useful information such as limitation of codes, suggested reduction factors, etc is given in order to reach a safety and economic design purpose.

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Comparison of Design Formula For Buckling of Cylindrical Steel Shells under Axial Compression

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Estimation of the Amount of Wind-driven Salt Affected by Geography and Adhesion of the Particles to Steel Structures

Hideharu NAKAMURA, Katashi FUJI, Kotomi OGATA, Yoshitaka TAGUCHI

pp. 43-54

DOI:

10.11273/jssc1994.14.54_43

Abstract

There exist many important civil engineering steel structures which have been used for more than several decades, and the importance of proper maintenance of these structures is increasing more and more in the future. Airflow distribution around a structure is recognized as one of the factors causing the difference of corrosion state, and corrosion progresses remarkably in the salt particle flying areas. In this paper, we examined simulation methods composed of two stages to estimate the amount of wind-driven salt and adhesion of the particles to structures. The fast stage consists of numerical airflow analyses considering local geography and simulation of wind-driven salt particles based on the airflow analyses, and the second stage is simulation of adhesion of the particles to structures by cellular automata (CA). It is confirmed that the simulation methods investigated in this paper are applicable to maintenance of corroded steel structures.

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Estimation of the Amount of Wind-driven Salt Affected by Geography and Adhesion of the Particles to Steel Structures

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Study on Weak-axis Beam-to-column Connections with Steel Channels

Hiroshi TAGAWA, Xingguo HOU

pp. 55-68

DOI:

10.11273/jssc1994.14.54_55

Abstract

This study investigates weak-axis beam-to-column connections with steel channels. For the pinned connections using a single shear plate, the bending yield strength formulas are shown and the required channel length is proposed. The rib-reinforcement for the shear plate is investigated for avoiding the failure of the channel web plate due to the axial force from the weak-axis beam. For the semi-rigid connections, stiffness formulas are derived for the connection elements as well as the rotaion of the connections. Experiments are conducted to determine the accuracy of the derived formulas of connection strength and stiffness.

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Study on Weak-axis Beam-to-column Connections with Steel Channels

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Experimental Study on Fiber Stress-Strain Relationship of Concrete-Filled Steel Members Subjected to Bending and Torsion Simultaneously

Yongri AN, Masahide MATSUMURA, Toshiyuki KITADA

pp. 69-81

DOI:

10.11273/jssc1994.14.54_69

Abstract

It is important to formulate the stress-strain relationship of the encased concrete of concrete-filled steel members with rectangular cross section subjected to bending and torsion simultaneously by considering confined effect due to the outer steel plates in order to simulate the elasto-plastic and finite displacement behavior up to and in the vicinity of the ultimate state of these members. Then, formulated in this paper is the stress-strain relationship of the encased concrete of these members by extending the existing theory of concrete-filled steel members subjected to pure torsion. Also carried out is a loading test on the ultimate strength of concrete-filled steel box members subjected to bending and/or torsion to verify the proposed formulation of the stress-strain relationship of the encased concrete.

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Experimental Study on Fiber Stress-Strain Relationship of Concrete-Filled Steel Members Subjected to Bending and Torsion Simultaneously

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Empirical Formulae Estimating Strength of Weld Metal Considering with Change of Chemical Composition of Weld Wire by Heat Input

Yuzo NISHIDA, Mototsugu TABUCHI, Toshihiko NAKANO

pp. 83-94

DOI:

10.11273/jssc1994.14.54_83

Abstract

We suggested empirical formulae estimating tensile strength and yield strength of weld metal depend on cooling time and chemical composition (mCe) of weld metal. The cooling time is estimated by plate thickness, heat input and interpass temperature. However, the carbon equivalent of the weld metal mCeq can't be esitmmated by the chemical composition of weld wire(wCeq), because wSi and wMn are oxidized and WC, wMo are diluted to the steel plate. In this paper, for the purpose of simple estimation of strength of weld metal, mCeq is estimated by heat input and WCeq. As a result, the chart to predict the strength of the weld metal as a variable on interpass temperature and wCeq is suggested.

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Empirical Formulae Estimating Strength of Weld Metal Considering with Change of Chemical Composition of Weld Wire by Heat Input

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An Evaluation Formula for Fatigue Strength of Web-Gusset Welded Joints Repaired by Bolting-Stop-Hole Method under Combined Stress Field

Takeshi MORI, Daisuke UCHIDA, Takeshi IKETANI

pp. 95-104

DOI:

10.11273/jssc1994.14.54_95

Abstract

Bolting-Stop-Hole Method i s one of useful repair methods for the fatigue crack in welded steel structures. The authors have already proposed empirical formula for estimating the fatigue strength of steel members repaired by this method under axial stress or in-plane bending stress field. In this study, for the purpose of evaluating repair effects of the method against web gusset welded joints with fatigue cracks under combined stress field (normal stress and shear stress) and indicating an expression formula for evaluation on the fatigue strength of the repaired joints, finite element stress analyses and fatigue tests have been performed on model specimens.

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An Evaluation Formula for Fatigue Strength of Web-Gusset Welded Joints Repaired by Bolting-Stop-Hole Method under Combined Stress Field

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Mechanical Characteristics of Steel Bellows as Energy Absorbing Bridge Connecters during Stationary and Seismic Phase

Hiroshi ZUI

pp. 105-120

DOI:

10.11273/jssc1994.14.54_105

Abstract

In this paper, mechanical characteristics of steel bellows as energy absorbing bridge connecters are investigated. Steel bellows are connected between girders or between girders and abutments in order to reduce the damage of steel girders. Bending and shearing examinations, and the repeated-load examination for axial and transverse directions are carried out using the small partial model with the slit in the bolt joint. Stable sliding was reproduced in the process of the repeated-load of the axial direction, and after sliding occurred at the joint, the large strains of the steel bellows were reduced and low cycle fatigue life was improved. Design formulas concerning the yield strength and yield displacement of steel bellows for transverse directions are developed based on the principle of virtual work. The values obtained by the design formulas are compared with calculated values by FEM and their accuracy are confirmed.

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Mechanical Characteristics of Steel Bellows as Energy Absorbing Bridge Connecters during Stationary and Seismic Phase

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Fabrication of Ultra High Strength Bol t and Its Mechanical Properties

Yuuji KIMURA, Eiji AKIYAMA, Kaneaki TSUZAKI

pp. 121-127

DOI:

10.11273/jssc1994.14.54_121

Abstract

A set of hexagon bolt, hexagon nut and plain washers, of which strength is 1700MPa-class, were fabricated from a 0.6%C-2%Si-1%Cr-1%Mo steel. The feature of this steel is both ultra high strength and high resistance against delayed fracture. The fabrication process and the mechanical properties that were obtained from the standard materials tests were reported in this study.

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Fabrication of Ultra High Strength Bol t and Its Mechanical Properties

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