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Kou kouzou rombunshuu Vol. 6 (1999), No. 22

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. 6 (1999), No. 22

An Experimental Study on the Shear Strength of Anchor Bolts Embedded in Concrete (Relations Between Shear Strength and Distance Mainly on Base Concrete)

Hisao KAWANO, Toshiaki TACHIBANA, Kanshi MASUDA

pp. 1-10

DOI:

10.11273/jssc1994.6.22_1

Abstract

In case the edge distance from the anchor bolts to base concrete is comparatively short, the ultimate shear strength is expected to be determined by the failing of the base concrete. Therefore, the specimens that make the edge distance from the anchor bolts(13∅-25∅) to the base concrete and the base concrete strength were established as parameters. In this paper, the experiment results are presented for when each specimen received the sharing force effect.

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An Experimental Study on the Shear Strength of Anchor Bolts Embedded in Concrete (Relations Between Shear Strength and Distance Mainly on Base Concrete)

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Prevention of Out-of-Plane Deformation Generated by Fillet Welding

You Chul KIM, Kyong Ho CHANG, Kohsuke HORIKAWA

pp. 11-16

DOI:

10.11273/jssc1994.6.22_11

Abstract

Fillet welding was perfonned in constructing the steel structures which were assembled by plates and stiffeners. Out-of-plane deformation was generated by fillet welding. Validity of the preset distortion method, which had been well known as a prevention method of outof-plane deformation, was investigated. It was elucidated that out-of-plane deformation could be prevented only when the preset distortion was given as an initial deformation which was same as deformation generated by fillet welding. In fillet welding, angular distortion was larger than longitudinal bending deformation. A prevention method of angular distortion, in which the opposite side of the welding surface was heated, was proposed and the applicability was shown.

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Prevention of Out-of-Plane Deformation Generated by Fillet Welding

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Lateral-Torsional Earthquake Response of Multi-Story Buildings With Rigidity Eccentricity in Arbitrary Floors

Masao WATANABE, Toshihiro MIKI

pp. 17-28

DOI:

10.11273/jssc1994.6.22_17

Abstract

This paper describes the lateral-torsional responses in the elastic range of single-story and multi-story buildings with rigidity eccentricity subjected to earthquake ground motion. Firstly, the appropriate parameters for lateral - torsional response are investigated to show the behavior of single-story buildings. Secondly, the dynamic equation of motion for the multi-story buildings with eccentricity is derived. The numerical results by using the modal analysis approach discuss the lateral-torsional responses of five-story buildings under the condition of the overall and partial rigidity eccentricities. Finally, the approximate method for evaluating the lateral-torsional response is proposed on the bases of the comparison with the exact solution.

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Lateral-Torsional Earthquake Response of Multi-Story Buildings With Rigidity Eccentricity in Arbitrary Floors

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Noise Reduction Countermeasures of End Links

Tsuyoshi MATSUMOTO, Satami MURASE, Teizo IKEDA, Osamu NAKANISHI

pp. 29-39

DOI:

10.11273/jssc1994.6.22_29

Abstract

The stiffening truss girder of the Shimotsui-Seto Bridge, which is a suspension bridge for both highways and railways, are supported by end links at its ends. From 1993, end links began to emit large noises when heavier freight trains passed. To reduce these noises, the source of them were investigated by Acoustic Emission Method. It was found out that the stick-slip phenomenon of metal surfaces of the pivot structure at lower end of end link columns was the source of the noises. To solve this problem, liquid lubricant to prevent stick-slip phenomenon was injected to the surfaces through bored holes. The result was successful.

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Noise Reduction Countermeasures of End Links

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Comparative Study on the Recorded and Analyzed Response of Ohnaruto Bridge due to Hyogo-Ken-Nambu Earthquake

Osamu YOSHIDA

pp. 41-56

DOI:

10.11273/jssc1994.6.22_41

Abstract

The seismic response of the Ohnaruto Bridge due to Hyogo-ken-nambu Earthquake(1995) was recorded. Time history response analysis for the 3-dimensional superstructure model was carried out inputting the measured acceleration on the substructure. The analyzed deflection wave was compared with the measured one, applying the Fourier transform. The most part of analyzed deflection waves fairly resembled to the measured one. However, typical discrepancy between the measured and the analyzed value was found on the vertical deflection at the midpoint of stiffening girder. The measured deflection value was mainly composed with symmetrical bending mode accompanied by torsional mode. Nevertheless, the symmetrical bending mode was hardly found on the analyzed deflection.

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Comparative Study on the Recorded and Analyzed Response of Ohnaruto Bridge due to Hyogo-Ken-Nambu Earthquake

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Ultimate Temperatures of Steel Beams Subjected to Fire

Hirohumi NAKAGAWA, Hiroyuki SUZUKI

pp. 57-65

DOI:

10.11273/jssc1994.6.22_57

Abstract

It is clarified that the ultimate temperatures of steel beams are in good agreement with the solution based on the simple plastic theory considering solely the reduction in material yield strength according to temperature increase. The solution so predicted is herein called a primary ultimate temperature which is a simple structural characteristic quantity independent of thermal stresses. In this study, simple beams and steel beam-with-concrete slabs are analyzed by a refined three dimensional finite element analysis which takes both material and geometrical nonlinearities as well as thermal expansion into account. Comparison between both primary temperatures derived from simple plastic theory and temperatures analyzed by numerical analysis suggests the practical applicability of the simple plastic theory for the prediction of the ultimate strength of steel beams subjected to fire.

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Ultimate Temperatures of Steel Beams Subjected to Fire

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A Study on Fabrication of Box Girders in Steel Bridge

Kuniaki MI NAMI

pp. 67-78

DOI:

10.11273/jssc1994.6.22_67

Abstract

Automation has recently extensively developed in bridge fabrication. In the case of girders of box-section, only the panels composing them are fabricated in assembly lines with robots. The automatic welding has, however, not been Fully utilized for formation of box section, because it is difficult to manipulate the welding machines inside, their interior structures are complicated, and the feasibility of use of the automatic welding has been regarded to be too low. Instead, manual welding has generally been used for this purpose, but welders are obliged to work under very adverse circumstances in this case. In this paper, when the panels composing girders of boxsection are fabricated in assembly lines with robots, the author proposes a method using robots for welding in the interior of box-girders by which diaphragm and cross rib details are improved. Especially cross rib details are discussed though stress analysis using finite element method.

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A Study on Fabrication of Box Girders in Steel Bridge

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The suggestion of Buckling Coefficient of Webs with Flanges subjected to Localized Edge Loading

Koichi SAKUGAWA, Kazuo OHGAKI, Akihisa YAMAMOTO, Youji TAMURA, Katsutoshi KAWAJIRI

pp. 79-90

DOI:

10.11273/jssc1994.6.22_79

Abstract

This paper presents the buckling coefficient of plate girder panels with flanges subjected to localized edge loading. When the buckling load of plate girder panels subjected to localized edge loading is calculated, the buckling coefficient not considering torsion rigidity of flange has been used. However, now days two plate-girder bridge is becoming to a major bridge structure type. So the flange plate thickness of the plate girders has not been able to be ignored. This paper proposes the easy formula of the buckling coefficient of plate girder panels with flanges subjected to localized edge loading.

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The suggestion of Buckling Coefficient of Webs with Flanges subjected to Localized Edge Loading

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