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Kou kouzou rombunshuu Vol. 7 (2000), No. 28

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. 7 (2000), No. 28

Long Term Fatigue Behaviour of Plate Girder Bottom Flanges with Longitudinal Out - of - Plane Attachments

Masahiro SAKANO, Eiichi YONEMOTO

pp. 1-10

DOI:

10.11273/jssc1994.7.28_1

Abstract

The long term fatigue behaviour of plate girders with longitudinal out-of-plane attachments on the bottom flange was investigated. Fatigue cracks were initiated at the attachment-side fillet weld toe and propagated through the fillet weld to break out the bottom flange. Fatigue strength of plate girder flanges with longitudinal out - of - plane attachments was found to be lower than the lowest Category IH of JSSC Fatigue Design Recommendations.

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Long Term Fatigue Behaviour of Plate Girder Bottom Flanges with Longitudinal Out - of - Plane Attachments

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Low-Cycle Fatigue Properties of Notched Structural Metals with Prolonged Circular Hole

Akihiro MORIMOTO, Eiichi MATSUMOTO, Toshihito UESUGI

pp. 11-17

DOI:

10.11273/jssc1994.7.28_11

Abstract

The estimation of low-cycle fatigue life for the notched components is one of the most important technologies for the structural metals. In this study, the low-cycle fatigue tests were carried out using the smooth round bar specimens and the notched plate specimens with several stress concentration factors. The materials used are the hot-rolled low-carbon steel sheets, SM400A, SM400B and SM490A. After analyzing the experimental data, the effect of material strength on low-cycle fatigue strength and the estimating method of low-cycle fatigue strength of notched components have been clarified.

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Low-Cycle Fatigue Properties of Notched Structural Metals with Prolonged Circular Hole

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Experimental Study on the Fracture Process ofBeanng Supports by Hyogoken Nanbu Earthquake

Hisanori OTSUKA, Kiichirou YAMAHIRA, Kouichi MASUDA, Shigeyuki KURIKI

pp. 19-31

DOI:

10.11273/jssc1994.7.28_19

Abstract

It was confirmed that many urban viaduct were damaged around bearings by Hyogoken Nanbu Earthquake. In case of bearing supports were damaged heavily, it was indicated that secondary damages were occurred by the collision of upper structure with lower structure. However, a modeling of bearing support is difficult for seismic response analysis because studies about seismic capacity of bearing supports are not enough yet. Therefore, it is necessary to clear the process of fracture of bearing support during strong earthquake. In this paper, we proved the process of fracture of pin type bearing supports by the experimental approach.

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Experimental Study on the Fracture Process ofBeanng Supports by Hyogoken Nanbu Earthquake

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A Design Method Using Equivalent Linear Method of Simple Steel Girders and Piers System with Energy Absorbing Bridge Restrainers

Hiroshi ZUI, Masashi NAKANO, Osamu OHTANI, Yasuhiro OKAMOTO

pp. 33-44

DOI:

10.11273/jssc1994.7.28_33

Abstract

This paper proposes a design method using equivalent linear method of simple steel girders and piers system with energy absorbing restrainers. The shoes of the bridge are intentionally collapsed as fuse members for heavy earthquakes, and after collapses of shoes, inertia forces and response displacements of girders are restrained by energy absorption made by steel bellows. The previous report showed the effectiveness of the proposal method by nonlinear dynamic response analysis. For multi-span simple girders, each yield strength of bellows need to be optimized and simple design methods is desired to determine ideally combination of yield strength of bellows. The proposed design methods is based on linearized modal analysis and response spectrum analysis. Nonlinear dynamic response analyses are carried out to examine the accuracy of the proposal design method.

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A Design Method Using Equivalent Linear Method of Simple Steel Girders and Piers System with Energy Absorbing Bridge Restrainers

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Application of numerical analysis of windborne salt to the bridge design

Masashi NATO, Katsuaki TAKEDA

pp. 45-54

DOI:

10.11273/jssc1994.7.28_45

Abstract

In the vicinity of the seaside uncoated weathering steel is not recommended to bridges if the quantity of windborne salt is above the prescribed value. This value is based on the experimental data obtained in flat and open area. The quantity of windborne salt can be below the prescribed value if some mountains are located between the bridge construction site and the seaside. The numerical evaluation of windborne salt is introduced to expand the applicability of weathering steel to bridges. In addition the simulation around the bridge girder section is also introduced in order to prevent local rust caused by locally adhering salt.

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Application of numerical analysis of windborne salt to the bridge design

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Design Method of Steel Column-to-column Joints with Partial Penetration Groove Weld

Kei YAKUSHIJI, Shinichi SAKAMOTO, Yoshitaka YABE, Shinji MASE

pp. 55-62

DOI:

10.11273/jssc1994.7.28_55

Abstract

The authors have studied on the structural behavior of steel column-to-column joints with partial penetration groove weld. This paper discussed the design method for the partial penetration groove welded joints, and then proposed the design method specifically for throat thickness of the joints. In order to ensure the possibility of appl icat ion of the joints, the prel iminary design was done for an eight-story bui lding using the results of axial, moment, and shear forces obtained by seismic response analysis.

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Design Method of Steel Column-to-column Joints with Partial Penetration Groove Weld

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High-cycle Fatigue Properties of Column-to-column Joints with Partial Penetration Groove weld

Kei YAKUSHIJI, Yoshitaka YABE, Yoshitaka YABE, Tatsumi HORIE

pp. 63-69

DOI:

10.11273/jssc1994.7.28_63

Abstract

This paper discusses the high-cycle fatigue properties of box section steel column members with the partial penetration groove welded joints. High-cycle bending fatigue tests of the column members are carried out. The summaries of the results are shown below. There are two fracture types; one is the type of fracture at the column-to-column joints and other is the type of fracture at the column-to-base-plate joints. The fatigue life of the column-to-base- plate joints satisfy F class of JSSC fatigue design curve, and the fatigue life of column- to-column joints satisfy H class of it. The Fatigue life of the column-to-column joints could be estimated from their fatigue crack propagation properties.

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High-cycle Fatigue Properties of Column-to-column Joints with Partial Penetration Groove weld

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Study on Mechanical Property of Site Welding Type Beam-to-Column Connection

Aki KAWANORI, Isao KOHZU

pp. 71-85

DOI:

10.11273/jssc1994.7.28_71

Abstract

The strength and deformation capacity of site welding type steel beam-to-column connection were investigated, especially focussing on the effect of material of run off tabs and the grade of welding wires. Ceramic or steel tab was used, and the end of beam of JIS SN49OB was welded to the diaphragm using JIS YGW 11 wire or YGW22. Four types of subassemblage specimens different from each other in combination with tabs and welding wires were prepared. The test result showed that the specimens fabricated using steel tabs exhibited poorer deformation capacity as compared with those fabricated using ceramic tabs, in spite of the difference of welding wires.

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Study on Mechanical Property of Site Welding Type Beam-to-Column Connection

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