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Kou kouzou rombunshuu Vol. 5 (1998), No. 19

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. 5 (1998), No. 19

Research Study on the Structural Members and Those Connections of High - Rise Steel Buildings

Gang QIAN, Hiroshi MASUDA, Atsuo TANAKA

pp. 1-8

DOI:

10.11273/jssc1994.5.19_1

Abstract

In this paper the results of a research about the structural members, those connections and structural characteristics of 50 existing high rise steel buildings are summarized. The bights of those buildings are between 45m to 60m. Most of those buildings are office buildings. 80 % of the beam-to-column connections are designed as WBFW(web bolted and flange welded) type connections. 96 % of the designed ultimate bending strength of the beam-to-column connections are larger than 1.265(=1.1x1.15) times of the full plastic moment of the connected beams. The ratio of the yield strength of panel zone to the plastic bending strength of connected members and the ratio of the plastic bending strength of columns to that of beams are also investigated.

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Research Study on the Structural Members and Those Connections of High - Rise Steel Buildings

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Evaluation of Bearing Capacity of Joint Panels for Railway Mixed Structures

Kiyomitsu MURATA, Makoto YASUHARA, Masanori KINOSITA, Takuzo KUZU

pp. 9-20

DOI:

10.11273/jssc1994.5.19_9

Abstract

At present, Concrete filled steel Tubular columns, called CFT columns, draw attention as a structural member of high seismic resistibility. While the application of CFT columns to the pier or pile increases, many studies focusing mainly on CFT column bodies are carried out. On the other hand, when CFT columns are used as a structural member of railway mixed structure, CFT column may not demonstrate a high seismic performance without an adequate bearing capacity of joint panels. In this paper, studying the bearing mechanism based on a series of tests of joint panels where CFT columns are directly embedded into the concrete footing and on a series of tests of RC or SRC beam-to-CFT column joint panels, the evaluation of the bearing capacity for these joint panels is worked out with simple models.

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Evaluation of Bearing Capacity of Joint Panels for Railway Mixed Structures

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Experimental Investigation of Fatigueof steel Under Corrosive Environment

Hidehico ABE, Tomoyuki MOROHASI

pp. 21-27

DOI:

10.11273/jssc1994.5.19_21

Abstract

Many bridges are constructed near sea shore and across straits in Japan. The fatigue problem under salty environment should be considered as one of the most important issues for maintenance of steel bridges. The objective of the present paper is to clarify the characteristics of fatigue of steel members under the salty environment. The crack propagation in the steelspecimens is measured through a magnifier. The influences of factors, such as the environment and the cyclic speed of loading on the crack growth rate are investigated. Using Paris' Equation, the fatigue life of butt-welded pieces with undercuts under salty environment is predicted, based on our test results using specimens of plates with holes.

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Experimental Investigation of Fatigueof steel Under Corrosive Environment

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Fracture Toughness of Pipe-Type Steel Piers Damaged by the Kobe Earthquake

Ichiro OKURA, Jun TAHARA, Osamu YASUDA, Masahiko HIRONO

pp. 29-37

DOI:

10.11273/jssc1994.5.19_29

Abstract

The purpose of this study is to give the cause of cracking at the middle part of steel piers with a circular cross section damaged by the 1995 Kobe Earthquake. We investigate the residual strains, hardness and Charpy absorbed energy of the steel plate with a local buckling deformation in the pier that was hit by the Earthquake. The synthetic consideration for the obtained results and the features of the fracture toughness of the steel plates at the period when the piers were fabricated, concludes that it would be one of the causes of cracking that the fracture toughness in the pier direction was originally small.

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Fracture Toughness of Pipe-Type Steel Piers Damaged by the Kobe Earthquake

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A Study on the Structural Performance of H-Beam-to-RHS Column Connection Reinforced by Increasing Column Thickness

Kaji MORITA, Kenichi FUJITA, Keiji YOKOI, Keizo FURUSAWA

pp. 39-53

DOI:

10.11273/jssc1994.5.19_39

Abstract

The structural behaviors of beam-and-column subassemblage reinforced by increasing column thickness at the connection area without inner diaphragms in addition to the horizontal haunch of beam at the connection side are investigated by the cyclic reversal loading test and finite element analysis. The case studies are presented to discuss the structural performance of beam-to-column connection by using finite element analysis and yield line theory with respect to two types of connection: (1) the beam-to-column connection reinforced by increasing the column thickness at the connection area, and (2) the beam-to-column connection reinforced by increasing the column thickness at the connection area with the horizontal haunch of beam at the connection side.

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A Study on the Structural Performance of H-Beam-to-RHS Column Connection Reinforced by Increasing Column Thickness

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Study of Practicability and Quality Problems on Actually Practicing the Method of Phosphate Treatment to Friction Surfaces of Hot Dip Galvanized Coatings

Takayuki KOHASHI, Masayasu SATOU

pp. 55-64

DOI:

10.11273/jssc1994.5.19_55

Abstract

The previous reported that a high coefficient of friction could be obtained by applying phosphate treatment to zinc galvanized coatings. However, it cannot be said that practicability and quality problems in actually practicing the method have been fully examined and cleared. Therefore, in this study, problems in possible processes to be taken and in quality were further investigated. The results showed that the phosphate treatment was a puctical and highly reliable process and thus its practical use could be concluded to be no problem.

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Study of Practicability and Quality Problems on Actually Practicing the Method of Phosphate Treatment to Friction Surfaces of Hot Dip Galvanized Coatings

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Earthquake-Resistant Ability of Low or Middle Rise Steel Building Structures Part. 1 Outlines of the Investigated Structures and Structural Members

Hiroshi MASUDA, Atsuo TANAKA, Satoshi AKITA, Kentarou MAEDA

pp. 65-72

DOI:

10.11273/jssc1994.5.19_65

Abstract

In this paper the result of a research about the structural members, those connections and structural characteristics of 92 existing low and middle rise steel buildings are summarized. The structure of all those buildings are designed as pure moment resisting frames. All beam-to-column connections are designed as shop welding type rigid connections. Most of the designed ultimate bending strength of the beam joints are larger than 1.2 times of the full plastic moment of the connected beams. The ratio of the yield strength of panel zone to the plastic bending strength of connected members and the ratio of the plastic bending strength of columns to that of beams are also investigated.

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Earthquake-Resistant Ability of Low or Middle Rise Steel Building Structures Part. 1 Outlines of the Investigated Structures and Structural Members

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A Parametric Study on the Ultimate Strength of the Full Model of Two-Hinge Three-Span Suspension Bridges Due to Vertical Loads

Shunichi NAKAMURA, Katuki OGAMI

pp. 73-83

DOI:

10.11273/jssc1994.5.19_73

Abstract

Elasto-plastic large deflection FEM analysis is carried out to investigate the ultimate strength and failure mode of two-hinge three-span suspension bridges consisting of cables, hangers, stiffened girders and towers with different combination of member safety factors. In many cases elastic buckling of tower occurs and leads to the collapse of the whole bridge system, accompanied by plasticity of hangers or cables at the ultimate stage in some cases, but a plastic hinge forms in the middle of tower and collapses the whole bridge system when residual stresses are introduced in the tower section. It is found from this parametric study that the safety factor of cables more significantly affects the ultimate strength of the system than other members.

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A Parametric Study on the Ultimate Strength of the Full Model of Two-Hinge Three-Span Suspension Bridges Due to Vertical Loads

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Numerical Simulation of Steel Pipe Column with Outer Pipe for Seismic Retrofit

Hiromichi YASUNAMI, Masahiro TERADA, Tohru NATORI, Jun MURAKOSHI

pp. 85-96

DOI:

10.11273/jssc1994.5.19_85

Abstract

Regarding the seismic retrofit of a steel pipe column by attaching an outer pipe with clearance at the portion where local buckling occurs, we investigated the effects of various factors of the outer pipe (clearance between outer pipe and steel pipe, wall thickness and mechanical properties of outer pipe) on the ductility of the steel pipe column, by conducting an elasto-plastic FEM analysis using shell elements as parameters, in a test similar to that which reproduces quasi-static cyclic load on a cantilever model test specimen. And using the analysis results thus obtained, we proposed the guide specifications for structural reinforcement to attain necessary ductility and a formula for estimating the ductility ratio of the reinforced steel pipe column with various types of outer pipe.

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Numerical Simulation of Steel Pipe Column with Outer Pipe for Seismic Retrofit

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Shear Capacity of Beam-Column Joint Composed of Steel Beam and Reinfoced Concrete Column

Youichi MIYANO

pp. 97-105

DOI:

10.11273/jssc1994.5.19_97

Abstract

Recently, mixed structure composed of reinforced concrete columns and steel beams have been used in the construction of buildings. A great number of reseach papers according to the beam-column joints also have been published for these few years. However, the stress transfer mechanism in the beam-column joints has not been clarified yet, especially in the type of through column type of joint. In this paper, a method to determine the shear force ratio between concrete part and steel part of the joint is proposed in the through column type joint based on the test results and stress transfer mechanism.

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Shear Capacity of Beam-Column Joint Composed of Steel Beam and Reinfoced Concrete Column

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Stress Analysis of Adhesive-Bonded Cylindrical Lap Joints by Hybridlmixed Finite Element Method

Mei DUAN, Yutaka MIYAMOTO, Shoji IWASAKI, Hideaki DETO

pp. 107-116

DOI:

10.11273/jssc1994.5.19_107

Abstract

Hybrid/mixed finite element method (HMFEM) of 4-node and 8-node quadrilateral element and displacement finite element method (DFEM) of 6-node triangle element are presented for the axial symmetry problem of three dimension and are applied to make some stress analyses for adhesis -bonded cylindrical lap joints. Numerical computations show HMFEM gives more satisfactory conclusion than DFEM.

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Stress Analysis of Adhesive-Bonded Cylindrical Lap Joints by Hybridlmixed Finite Element Method

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Reliability of Hysteretic Damper and Role of Maintenance

Yasuhiro MORI

pp. 117-129

DOI:

10.11273/jssc1994.5.19_117

Abstract

A hysteretic damper must be ductile enough to consume the energy of repeated earth quakes and to mitigate damage on columns and beams. This paper describes a simple method to evaluate the cumulative ductility response factor and presents a statistics of the response factor using numerical examples. The failure probability of a hysteretic damper is also presented taking the deterioration of the damper due to repeated loading into account. The reliability of a hysteretic damper depends on the structural characteristics and the capacity of the damper and the replacement of the damper may have to be considered depending on the combination.

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Reliability of Hysteretic Damper and Role of Maintenance

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