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Kou kouzou rombunshuu Vol. 6 (1999), No. 23

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. 23

Internationalization of Design Codes and Steel Structures

Yuhshi FUKUMOTO

pp. 1-7

DOI:

10.11273/jssc1994.6.23_1

Abstract

The much effort has gone for the development of the major design codes such as AISC (1993)/AASHTO (1994) LRFD, Eurocode 3 (1992), ISO 10721-1(1997). This paper reviews firstly the stability design guidelines of JSCE, AIJ, ECCS and SSRC which are prepared in order to give the theoretical and experimental bases for the relevant design formulas in the major steel structural codes. Comparisons are made for the column design curves and for the beam design curves. The design shear buckling resistance of plate girders in the tension field method are compared numerically for the web slenderness ratio of 300 in the major structural codes.

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Internationalization of Design Codes and Steel Structures

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Study of Fatigue Capability of Galvanized Friction Joints Treated with Phosphate

Takayuki KOHASHI, Masayasu SATOU

pp. 9-18

DOI:

10.11273/jssc1994.6.23_9

Abstract

we have decided to conduct a pulsating fatigue test so that we can understand the fatigue property of the galvanized friction joints treated with phosphate.Moreover, it is observed during the fatigue test that the slip tends to be controlled after it has become integrated into the joint following the gradual slipping and interlocking through the blast treatment. Thus, we have conducted a slip test repeatedly so that we can both understand the fatigue property based on the above observation and investigate the effect of the slip caused by an earthquake, etc-, too.

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Study of Fatigue Capability of Galvanized Friction Joints Treated with Phosphate

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Study of Reliability Limits of Slip Coefficients of Galvanized Friction Joints Treated with Phosphate

Takayuki KOHASHI, Masayasu SATOU

pp. 19-26

DOI:

10.11273/jssc1994.6.23_19

Abstract

Previous works have showed that the phosphate treatment is an excellent method of frictional surface treatment. However, it has not yet to be studied as to how much the scattering range of slip coefficient, when this method is applied . In this report, the reliability of the phosphate treatment based on the scattering range of slip coefficient after conducting a slip coefficient test as many as 192 times have been examined.As the result, it has been turned out that the phosphate treatment is a fully reliable method.

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Study of Reliability Limits of Slip Coefficients of Galvanized Friction Joints Treated with Phosphate

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Effective Horizontal Haunch Length of Beam-to-Box Column Connection

Naoki TANAKA, Yoshikazu SAWAMOTO, Yoshiyuki MITSUI

pp. 27-39

DOI:

10.11273/jssc1994.6.23_27

Abstract

Horizontal haunched beams are being increasingly used for preventing brittle fractures of beam flanges in the vicinity of beam-to-boxed-column moment-resisting connections. However, few studies have been carried out on the effect of haunch length on the plastic deformability of haunched beams. In this study, six specimens with two haunch lengths and beam lengths were statically loaded. The test results are also analyzed for their maximum strengths to determine the type of fracture, i.e., rupture or buckling. Suitable haunch lengths are proposed on the basis of the test and analytical results to avoid brittle fractures and to increase beam deformation capacity.

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Effective Horizontal Haunch Length of Beam-to-Box Column Connection

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Seismic Response Characteristics of Steel Bridge Piers Considering Inelastic Behavior of Pier Bases and Practical Approach for Estimating Maximum Response

Haruyuki SAKODA, Toshiyuki KITADA, Tamami ORYU, Taiichi KAGAYAMA

pp. 41-52

DOI:

10.11273/jssc1994.6.23_41

Abstract

In the seismic design of steel bridge piers and the retrofitting works for existing steel bridge piers against strong earthquakes, it is very important to know the dynamic behavior of the piers under the earthquakes. The dynamic behavior is dependent on not only the inelastic characteristics of the column members and pier bases, but also the interactive behavior of these structural components. Investigated in this paper, therefore, are the dynamic behavior of existing and stiffened steel bridge piers under the strong earthquakes specified in the Japanese Specifications for Highway Bridges, considering the inelastic behavior of the pier bases and column members. Through the results of the elasto-plastic and dynamic analyses of two retrofitted and existing steel bridge pier models supported by the anchor bolts with inelastic spring constant subjected to the strong earthquakes, a practical approach for estimating the maximum response is proposed for retrofitting and existing steel bridge piers, on the basis of the energy constant rule.

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Seismic Response Characteristics of Steel Bridge Piers Considering Inelastic Behavior of Pier Bases and Practical Approach for Estimating Maximum Response

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Static Characteristics and Nonlinear Seismic Response of Concrete-Filled Tubular Arch Bridge with Half-Through Deck

Yuqing LIU, Hiroshi HIKOSAKA, Baochun CHEN

pp. 53-61

DOI:

10.11273/jssc1994.6.23_53

Abstract

Concrete-filled steel tubes offer high load-carrying capacity and good ductility promising remarkable economical benefits. In this paper, an application of concrete-filled tubes to main arch ribs is discussed based on 3-dimensional static and dynamic analyses of a prototype half-through arch bridge. Particular attention has been paid to modeling nonlinearities arising in the arch rib composed of multiple concrete-filled tubes. The static finite element solution provides information useful in characterizing the ultimate strength and failure mode of the bridge.The bridge performance during a strong earthquake motion comparable to the Great Hanshin Earthquake is assessed in detail through a nonlinear time-history analysis.

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Static Characteristics and Nonlinear Seismic Response of Concrete-Filled Tubular Arch Bridge with Half-Through Deck

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Reliability-based Minimum Weight Design of Mechanism Specified Frames Considering Randomness of Yield Strength

Kiichiro SAWADA, Yuji NAKAMURA, Akira MATSUO, Akira OKAZAKI

pp. 63-69

DOI:

10.11273/jssc1994.6.23_63

Abstract

The ductility and energy dissipation capacity of a seismic resistant frame structure depends upon the assumed Collapse mechanism. And the type of the Collapse mechanism is much influenced by the randomness of yield strengths of members. In this paper, the yield strengths of members are considered as random variables, and the reliability-based minimum weight design method specifying the desirable Collapse mechanism is presented. Then the influence of the randomness of yield strengths upon the frames by the optimum design is studied.

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Reliability-based Minimum Weight Design of Mechanism Specified Frames Considering Randomness of Yield Strength

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Variation of Earthquake Input Energy of Steel Frames Accompanied With Plastic Deformations

Norio TANIMOTO, Koji OGAWA

pp. 71-79

DOI:

10.11273/jssc1994.6.23_71

Abstract

The apparent natural period (the time required for one cycle vibration) of steel frames accompanied with plastic deformations under strong ground motion is longer than the natural period calculated from the initial elastic stiffness. Because earthquake input energy by ground motion depends primarily on the apparent natural period, the plastic deformation of steel frames increases, the apparent natural period becomes longer, and earthquake input energy becomes higher. The present paper proposes the expression to approximate the mean of the apparent natural period in the whole vibration and demonstrates that the variation (increase) of the earthquake input energy of steel frames accompanied with plastic deformations can be predicted by using this expression.

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Variation of Earthquake Input Energy of Steel Frames Accompanied With Plastic Deformations

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Effective Length for Web Members in Circular Tubular Trusses

Kazunori KITAJIMA, Koji OGAWA

pp. 81-90

DOI:

10.11273/jssc1994.6.23_81

Abstract

This paper describes a method for the out-of-plane buckling analysis of circular tubular trusses with unstiffened tube-to-tube joints which includes not only the combined non-linear behavior of members but also the stiffness deterioration of joints due to the axial forces of web members. The buckling loads evaluated by our method agree well with experimental results. Effective column lengths are computed for a number of tubular trusses with various dimensions by using the method herein described. From these numerical results, effective column lengths for web members are found to be represented by a simple formula.

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Effective Length for Web Members in Circular Tubular Trusses

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Seismic Response Behavior of Steel Frames Having a Single Layer Latticed Cylindrical Roof

Akiko TAKEUCHI, Seishi YAMADA, Yoshiyuki TADA

pp. 91-98

DOI:

10.11273/jssc1994.6.23_91

Abstract

This study elucidates the three-dimensional seismic responses of the steel frame structures having single-layer latticed cylindrical roof. A finite element modal analysis using acceleration motion recorded at the Kobe Maritime Meteorological Observatory is performed. It is shown that the dominant components in the seismic response are the free vibration modes having relatively large participation factor. Large vertical acceleration on the roof occurs due to horizontal seismic motion. Large axial forces of the braces in the sub-structures are also shown to result from the vertical vibration of the roof.

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Seismic Response Behavior of Steel Frames Having a Single Layer Latticed Cylindrical Roof

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Simple Method for Estimating Stress Intensity Factor by Image Analysis

Kazuo TATEISHI, Hiroto OYAMADA, Ichiro ADACHI, Taketo UOMOTO

pp. 99-103

DOI:

10.11273/jssc1994.6.23_99

Abstract

A simple method to estimate the stress intensity factor was proposed. In this method, the displacement of the crack surface which could be directly related to the stress intensity factor was measured by image analysis on a digital photograph recorded with a portable digital microscope. As a result of the accuracy verification by the fatigue test on a CT specimen, it was shown that this method was available to estimate the stress intensity factor with good accuracy.

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Simple Method for Estimating Stress Intensity Factor by Image Analysis

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A Study on Limited-heat-input in Bridge Fabrication

Kuniaki MINAMI, Chitoshi MIKI

pp. 105-116

DOI:

10.11273/jssc1994.6.23_105

Abstract

In recent years, it has been discussing about reducing cost and labor in bridge fabrication. These are the most important subjects at present. As the way of reducing this cost, automatic welding or high-efficiency welding will be used increasingly. Automation has recently extensively developed in many factories, however, it is only few case using highefficiency welding. For this reason, Specifications for Highway Bridge regulates limited-heatinput( maximum heat input is 70KJ/cm on SM570). In this paper, based on many technical reports which is reported so far, it is investigated charpy absorbed energy by using high-heatinput welding. From the results of this investigation, the authors propose limited-heat-input. Finally, application of high-heat-input welding is described in steel bridge fabrication.

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A Study on Limited-heat-input in Bridge Fabrication

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Effect of Column-to-Beam Strength Ratio on Earthquake Responses of Steel Moment Frames

Masayoshi NAKASHIMA, Shinichi SAWAIZUMI

pp. 117-132

DOI:

10.11273/jssc1994.6.23_117

Abstract

This paper presents a numerical study on the column-to-beam strength ratio required for ensuring beam-hinging responses in steel moment frames. The major parameters adopted are; the type of frames, number of stories, type of beam hysteresis, and type and amplitude of ground motions. Major findings obtained are as follows: (1) the column-to-beam strength ratio that ensures beam-hinging responses increases steadily with the increase of the ground motion amplitude; and (2) the maximum story drift angle is about 1, 7 to 2.0 times lager than the maximum overall story drift angle, which indicates that this level of fluctuation in the story drift is present along the stories even for frames in which beam-hinging behavior is ensured.

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Effect of Column-to-Beam Strength Ratio on Earthquake Responses of Steel Moment Frames

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Effect of Column-to-Beam Strength Ratio on Earthquake Responses of Steel Moment Frames

Shinichi SAWAIZUMI, Masayoshi NAKASHIMA

pp. 133-148

DOI:

10.11273/jssc1994.6.23_133

Abstract

This paper examined the effects of the column-to-beam strength ratio on the earthquake response of steel moment frames. A series of numerical analysis was conducted for columnto-strength ratios successively decreased from the ratio for ensuring the column-elastic response. The change in response is not abrupt but gradual with the decrease of the ratio, and quantitative information is provided for the degree of change in the maximum story drift and beam and column maximum rotations with respect to the ratio.Additional analysis was carried out to investigate the effects of column base strength, PE moment, and strain hardening.

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Effect of Column-to-Beam Strength Ratio on Earthquake Responses of Steel Moment Frames

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Experimental Study on Fracture Behavior of Welded Beam-to-column Joint with Defects

Takahiko SUZUKI, Takumi ISHII, Koji MORITA, Koichi TAKANASHI

pp. 149-164

DOI:

10.11273/jssc1994.6.23_149

Abstract

This paper presents the results of tests conducted to investigate the influence of fracture toughness, weld defect and strain rate on fracture behavior. Tensile tests of welded butt joint and cyclic tests of welded beam-to-column connection with artificial defects were carried out, with combination of steel and welding wire, temperature, type and size of defect and loading speed as test variables. The experimental results show that maximum strength and plastic deformation capacity of the welded connections are attributed to the fracture toughness rather than to the size of defect and the strain rate.

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Experimental Study on Fracture Behavior of Welded Beam-to-column Joint with Defects

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