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Kou kouzou rombunshuu Vol. 16 (2009), No. 64

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. 16 (2009), No. 64

Seismic Capacity of Steel Moment Resisting Frames of JAPAN and U.S. Practice

Katsunori KANEDA, Yoshihiro KIMURA, Yuta FUNATSU, Akira WADA

pp. 64_1-64_10

DOI:

10.11273/jssc.16.64_1

Abstract

There are some differences in the steel structures from the view of seismic design and practice between U.S., and Japan. In Japan all columns and beams are the seismic elements in X and Y directions. In U.S. frames in the perimeter zone are only the seismic elements, and the columns inside the building are designed as the gravity columns which support only the weight of the building. In our previous research, it is clarified that such gravity columns can control story drift concentration during an earthquake. We need more study about the effect of damage control for beams and columns by the gravity columns. We will discuss about the seismic limit capacity of the moment resisting frames when the beams or the columns reach their plastic deformation capacities.

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Seismic Capacity of Steel Moment Resisting Frames of JAPAN and U.S. Practice

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FATIGUE EVALUATION OF TROUGH RIB TO DECK PLATE JOINT FAILED IN WELD THROAT

Samol YA, Kentaro YAMADA, Toshiyuki ISHIKAWA, Keita MURAI

pp. 64_11-64_20

DOI:

10.11273/jssc.16.64_11

Abstract

Fatigue evaluation of trough rib to deck weld joint failed in weld throat is presented. S-N curve of the joint is determined in term of stress range in weld throat by carrying out plate bending fatigue tests and collecting previous test data. Two approaches are proposed for calculating stress range in weld throat in actual bridge with orthotropic steel deck based on one or two points of measured stress. Both methods give approximate fatigue lives, suggesting one point of stress measurement is also possible in practice. By stress measurement at an actual bridge with orthotropic steel deck, stress range in summer tends to be higher and thus more damaging than in winter.

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FATIGUE EVALUATION OF TROUGH RIB TO DECK PLATE JOINT FAILED IN WELD THROAT

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A PROPOSAL ON LOW CYCLE FATIGUE STRENGTH CURVE FOR BASE JOINTS OF STEEL BRIDGE PIER

Takeshi HANJI, Kazuo TATEISHI

pp. 64_21-64_30

DOI:

10.11273/jssc.16.64_21

Abstract

Steel bridge piers are often used for elevated highway bridges. The Hanshin-Awaji earthquake in 1995 revealed two types of failure mode in the pier, which are local buckling and low cycle fatigue. However, researches on low cycle fatigue of civil structures are limited, and design methods have not been established yet.
In this study, low cycle fatigue strength curves for base joints of the steel pier based on nominal strain, which can be calculated by finite element analysis with a beam element, were proposed. Fatigue tests with steel pier specimens demonstrated that the proposed fatigue strength curves could provide fatigue life estimation with enough accuracy.

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A PROPOSAL ON LOW CYCLE FATIGUE STRENGTH CURVE FOR BASE JOINTS OF STEEL BRIDGE PIER

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STUDY ON THE SEPARATION AND ROTATION BEHAVIOR OF AN ELASTIC-HINGE JOINT SYSTEM

Yoshitaka MIYAMOTO, Akihiko OBATA, Yasushi UEMATSU, Takuya NIGORIKAWA

pp. 64_31-64_40

DOI:

10.11273/jssc.16.64_31

Abstract

A new joint system named ‘elastic-hinge joint system’ is proposed. This system shows a non-linear elastic restoring force-rotation relation and can realize origin-oriented frames. These properties can control damage and reduce permanent distortion in structures or in structural elements after a severe earthquake. This paper describes experimental results on a beam-column connection to which this joint system is applied. The purpose of this paper is to clarify the separation and rotation behavior of the elastic hinge joint. Based on the results, a theoretical model of this joint system is proposed.

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STUDY ON THE SEPARATION AND ROTATION BEHAVIOR OF AN ELASTIC-HINGE JOINT SYSTEM

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FRICTIONAL RESISTANCE OF SHEAR-TYPE FRICTION DAMPERS WITH LAP GAP

Peng-bo ZHANG, Yuping SUN, Takashi FUJINAGA, Jae-hyouk CHOI

pp. 64_41-64_48

DOI:

10.11273/jssc.16.64_41

Abstract

Sixteen shear-type friction dampers were made and tested under cyclical loading to investigate the effect of the lap gap on the frictional resistance of the damper. The test results have indicated that the frictional resistance of a shear-type friction damper depends not only upon the tensile force by the high-strength bolts that clamp the slipping steel plate but also strongly upon the lap gap. Based on the experimental results, a formula for assessing the effect of the lap gaps on the frictional resistance of the damper was developed. Comparisons between the measured frictional resistances and the predicted ones have indicated that the frictional resistance of a shear-type friction damper with lap gap could be evaluated by the proposed formula very well.

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FRICTIONAL RESISTANCE OF SHEAR-TYPE FRICTION DAMPERS WITH LAP GAP

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STUDY ON FRACTURE BEHAVIOR OF ELECTROSLAG WELDED JOINTS USING CRUCIFORM MODEL JOINTS

Yong Hun SONG, Hiroumi SHIMOKAWA, Takumi ISHII, Takahiko SUZUKI, Yoichi KAYAMORI, Yukihiro HARADA, Koji MORITA

pp. 64_49-64_63

DOI:

10.11273/jssc.16.64_49

Abstract

This study describes fracture strength of electro-slag welded (ESW) connections under biaxial loading condition. The discussions are based on model test results of ESW joints and finite element analysis (FEA) results with corresponding analytical models. Case studies are also made where an axial force ratio and a penetration shape are the analytical parameters. Results are summarized as follows; 1) The model test results show roughly positive correlation between the fracture toughness and the fracture strengths of ESW joints; 2) The model test results and the corresponding FEA results correlate the fracture toughness with calculated equivalent maximum principal stress(MPA); 3) In the results of the case studies, the calculated MPA in a heat affected zone highly depends on an ESW fusion line position.

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STUDY ON FRACTURE BEHAVIOR OF ELECTROSLAG WELDED JOINTS USING CRUCIFORM MODEL JOINTS

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INFLUENCE OF INCOMPLETE PENETRATION SIZE ON FATIGUE CRACK INITIATION POINTS OF LOAD-CARRYING CRUCIFORM WELDED JOINTS

Koji KINOSHITA, Shinpei ARAKAWA

pp. 64_65-64_70

DOI:

10.11273/jssc.16.64_65

Abstract

This paper investigates influence of incomplete penetration size on fatigue crack initiation points of load-carrying cruciform welded joints. The investigation was performed by fine meshed FEM using Effective Notch Stress Approach. As a result, to prevent fatigue crack initiated from welded root when the plate thickness is about 34mm, incomplete penetration size should be less than 10% of the plate thickness, and the influences of incomplete penetration size increase with an increase of the plate thickness. Also, a reduction of the stress at the weld root by increasing the weld size is not expected when the plate thickness is thick and welding becomes an unequal leg length welding.

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INFLUENCE OF INCOMPLETE PENETRATION SIZE ON FATIGUE CRACK INITIATION POINTS OF LOAD-CARRYING CRUCIFORM WELDED JOINTS

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Consideration of Design Procedures of AASHTO LRFD Bridge Design Code and Design Live Load Forces on Steel Plate Girders

Jun MURAKOSHI, Naoki YANADORI, Daisuke KOMORI

pp. 64_71-64_79

DOI:

10.11273/jssc.16.64_71

Abstract

This study is a part of research to introduce load and resistance factor design (LRFD) method to the Japanese Specification for Highway bridges, which is currently based on allowable stress design method. This paper describes outline of design procedures/provisions of steel highway bridges based on the AASHTO LRFD Bridge Design Specifications. And it also discusses the comparison of the design of simply supported plate girders between U.S. and Japan focusing on design live load/dead load.

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Consideration of Design Procedures of AASHTO LRFD Bridge Design Code and Design Live Load Forces on Steel Plate Girders

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Investigation of Steel Mechanical Properties on 1% Ni-advanced weathering steel

Kuniaki MINAMI, Chitoshi MIKI, Hideki YOKOYAMA

pp. 64_81-64_91

DOI:

10.11273/jssc.16.64_81

Abstract

Recently, many kinds of weathering steel were widely used in steel bridges. 1%Ni-advanced weathering steel is one of new types of weathering steel. It was considered that the quality of this steel has been remarkably improved. However, when it comes to how much, it has not been clarified. In this paper, we investigated the 753 of 1%Ni-advanced weathering steel on the basis of the mill sheet in order to clarify their quality. Investigated items were tensile strength, yield strength, charpy-absorbed-energy, elongation and yield ratio, and these steel mechanical properties were shown. We also showed the degree of improvement in the quality, comparing with the conventional weathering steel data.

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Investigation of Steel Mechanical Properties on 1% Ni-advanced weathering steel

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