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Kou kouzou rombunshuu Vol. 3 (1996), No. 11

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

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  31. Vol. 1 (1994)

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Kou kouzou rombunshuu Vol. 3 (1996), No. 11

Effects of Cyclic Plastic Strains on Fracture Toughness of Structural Steels

Ichiro OKURA, Jun TAHARA, Takaharu NISHIOKA, Osamu YASUDA

pp. 1-11

DOI:

10.11273/jssc1994.3.11_1

Abstract

The effects of cyclic plastic strains on the fracture toughness of structural steels and also the effects of strain aging on the fracture toughness of structural steels subjected to cyclic plastic strains are investigated by Charpy V-notch impact tests. The Charpy V-notch absorbed energy decreases with the increase of cycles of plastic strains. Especially, it drops greatly at the early cycles. The decrease of the absorbed energy is larger with the increase of the magnitude of plastic strains. The influence of the strain aging is small on the absorbed energy for the specimens under no loads and monotonic loading, but it is large under cyclic loading. The Charpy V-notch impact toughness is examined on the top and bottom flanges of a girder of a highway bridge hit by the 1995 Hyogoken-Nanbu Earthquake, Japan. The girder is shown to have not been subjected to cyclic plastic strains during the earthquake.

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Effects of Cyclic Plastic Strains on Fracture Toughness of Structural Steels

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Study on Damage of Steel Structures with Ribeted Joint Caused by the Hyogoken-Nanbu Earthquake

Akira KOWADA, Masanori KOBAYASHI, Takashi KITAGAWA, Toshiyuki IKEUCHI

pp. 13-20

DOI:

10.11273/jssc1994.3.11_13

Abstract

The Hyogoken-Nanbu earthquake struck two power plants in east part of Hyogo-Prefecture. These are large steel structures with ribeted joints designed in conformity with the past criteria. The structures suffered not so severe damage and the damage were watched at some of the braces. We tried to simulate the state of damage based on seismic response analyses and a full scale test of brace joints. Consequently the simulation could express the real damage and the joints would be damaged around the stress calculated by these analyses. In this study it was proved that the analyses were effective.

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Study on Damage of Steel Structures with Ribeted Joint Caused by the Hyogoken-Nanbu Earthquake

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An Investigation and Analysis on a Nine - story Steel Building Damaged by the 1995 Hyogoken - Nanbu Earthquake

Msaru TERAOKA, Hiroshi SHIMANUKI, Koji MORITA, Kazuhiko KOMONO, Tadayoshi OKADA

pp. 21-34

DOI:

10.11273/jssc1994.3.11_21

Abstract

A nine-story moment resisting steel frame consisting of cold formed hollow section columns and hot Rolled H-beams, which is located at the central part of Kobe city and was constructed in 1989, suffered severe damage to many welded beam-to-column connections during the 1995 Hyogoken-Nanbu earthquake. In this paper, damage to beamto-column was detailed and plausible causes of the damage were discussed from the perspectives of materials, connection details, and seismic capacity demands. And also, the repair works for the damage executed to recover the original strength, is introduced.

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An Investigation and Analysis on a Nine - story Steel Building Damaged by the 1995 Hyogoken - Nanbu Earthquake

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Modeling of Stress - Strain Relationships for Steel and Concrete in Concrete Filled Circular Steel Tubular Columns

Jialin TANG, Shin-ichi HINO, Ichirou KURODA, Toshiaki OHTA

pp. 35-46

DOI:

10.11273/jssc1994.3.11_35

Abstract

In this paper, a stress-strain relationship in concrete which takes account of the confining effect on the filled concrete is proposed to evaluate ultimate strength and deformation capacity of concrete filled circular steel tubular columns rationally. The confining effect is quantitatively derived from the characterization between Poisson's ratio and axial strain in steel and concrete filled tube under concentric loading. The applicability of the proposed stress-strain relationship in concrete as well as the influence of strain hardening in steel is discussed. Ultimate strength, curvature and deflection of the concrete filled circular columns are calculated on the basis of the proposed model in steel and concrete, comparing with the past test results. It is concluded that the predicted relations agree quite well with the test results.

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Modeling of Stress - Strain Relationships for Steel and Concrete in Concrete Filled Circular Steel Tubular Columns

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Nonlinear Impact Behavior Considering Strain Rate

Yoshito ITOH, Toshiharu SASADA, Takashi OHNO

pp. 47-58

DOI:

10.11273/jssc1994.3.11_47

Abstract

Computational impact analysis has been applied to civil engineering structures. Most of previous studies, though, were focused on the behavior of RC structures subjected to impactors such as missiles or aircrafts. The effect of strain rate on composite structures has not been clear so far. In this study, several impact analyses considering strain rate effects of steel and concrete are performed and compared to the experimental results. Anochor system of metal liners and steel pipes filled or unfilled with concrete under impact force are successfully simulated.

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Nonlinear Impact Behavior Considering Strain Rate

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Superposed Buckling Strength of Concrete filled Steel Tubular Columns Steel Tube with Elastic - Perfectly - Plastic Stress - Strain Relation

Keigo TSUDA, Chiaki MATSUI

pp. 59-64

DOI:

10.11273/jssc1994.3.11_59

Abstract

In a previous paper, authors calculated buckling strength of concrete filled steel tubular columns in two different ways. One is performed using the tangent modulus theory (Nsc), considering steel portion and concrete portion behave as a one body. The second one is the method of superposed strength in which a simple sum of separately computed buckling load of steel and concrete columns is regarded as a buckling strength (Ns+c). Ramberg-Osgood equation was used as the stress-strain relations of a steel tube in the paper. In this paper, elastic-perfectly-plastic stress-strain relations are used. Effect of the analytical parameters on the correspondence between the two strength is examined.

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Superposed Buckling Strength of Concrete filled Steel Tubular Columns Steel Tube with Elastic - Perfectly - Plastic Stress - Strain Relation

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Earthquake Response and Required Strength of Frames With Hysteretic Dampers

Kazuo INOUE, Susumu KUWAHARA, Motohide TADA, Masayoshi NAKASHIMA

pp. 65-77

DOI:

10.11273/jssc1994.3.11_65

Abstract

This paper deals with steel frames combined with hysteretic dampers and examine the strength required for the main frames consisting of beams and columns not to go beyond yielding under earthquake loading. Dynamic response analysis is carried out for equivalent single degree of freedom system, and interaction between the obtained responses and various structural parameters including the base shear coefficient CB is quantified. An analytical expression of CB is also formulated based upon the energy balance consideration. Primary parameters that control CB are found to be (1) the damper's shear strength ratio to the maximum resistance (β) and (2) the relative stiffness between the damper and main frame. It is also pointed out that an optimum j3 does exist by which CB can be minimized.

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Earthquake Response and Required Strength of Frames With Hysteretic Dampers

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