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Kou kouzou rombunshuu Vol. 2 (1995), No. 5

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

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  30. Vol. 1 (1994)

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    3. No.2
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Kou kouzou rombunshuu Vol. 2 (1995), No. 5

Rationalization and Automation of Beam - to - Column Welded Joints for Steel buildings

Tadao NAKAGOMI, Masahiko KARUBE, Tetsuya FUJITA

pp. 1-15

DOI:

10.11273/jssc1994.2.1

Abstract

In construction of steel buildings, the Beam-to-Column connection is one of the most important component in it. The structural design of Non-Scallop forms have improve the mechanical properties than a beam with normal scallop forms. Otherwise the technique of welding robot has completed in flat position welding, but not yet in other position welding. In this paper, we subscribe about the Rationalization of Beam-to-Column welding connection for steel Building with Non-Scallop structural joint design. And we also subscribe about the Automation and Robotization of these welding connection. According to this manuscript, Applying Non-Scallop method and Welding robots makes more efficiency and more rationality.

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Rationalization and Automation of Beam - to - Column Welded Joints for Steel buildings

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Development of Control System of Lifting loads by Floating Cranes in Erection

Haruyuki SAKODA, Takeshi EGAMI, Yutetu SAKAI

pp. 17-26

DOI:

10.11273/jssc1994.2.17

Abstract

The Rokko Island Bridge is a double deck steel arch bridge. It has 215.35m single span length and weights about 7, 000 tons. The bridge was assembled in a fabrication yard by the sea, and then lifted up, transported and erected as a whole bridge in 1992 by cooperation of three floating cranes. A new control system was developed and employed in order to ensure the safety of the bridge during erection. Lifting loads acting on each hooks of three floating cranes were measured and adjusted by the system. This paper presents this new control system.

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Development of Control System of Lifting loads by Floating Cranes in Erection

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EARTHQUAKE RESPONSE OF CABLE-STAYED BRIDGE IN CONSIDERATION OF SOIL-STRUCTURE INTERACTION

Teguh RAHARDJO, Toshiyuki SUGIYAMA, Yasuharu FUKASAWA

pp. 27-36

DOI:

10.11273/jssc1994.2.27

Abstract

The effect of soil-structure interaction upon the response of cable-stayed bridge subjected to a strong earthquake motions is investigated. The effect is evaluated by comparing its responses to the responses of rigidly supported base condition model. The strong earthquacke motions are represented by artificial earthquake motion in which the the characteristic values of ground condition adopted in Japanese Specification for Highway Bridges (JSHB) are considered. The results indicate that the soil-structure interaction effect should not be ignored when considering the safety of a long cable-stayed bridge.

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EARTHQUAKE RESPONSE OF CABLE-STAYED BRIDGE IN CONSIDERATION OF SOIL-STRUCTURE INTERACTION

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Evaluation of Costs and Seismic Capacity on the Thick - walled and Less - stiffened Steel Brridge Piers

Tomonori TOMINAGA, Hiromichi YASUNAMI

pp. 37-51

DOI:

10.11273/jssc1994.2.37

Abstract

A steel bridge pier cross section, which is consisted of comparatively thick wall and is stiffened by less number of stiffeners, is proposed from the view of seicemic capacity and construction costs. At first various cross-sections are designed and evaluated from the view of costs. Then, tests and analysis are undertaken to evaluate the seicemic capacity of proposed structures. The test specimens were cantilever steel box columns, modeling one-tenth scale steel bridge piers. Cyclic loading tests and on-line tests, simulating real earthquake response, were done on the specimens. Analysis was also done for the various cases of earthquakes and weight of superstructures. The steel bridge piers are proved to have enough seicemic capacity.

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Evaluation of Costs and Seismic Capacity on the Thick - walled and Less - stiffened Steel Brridge Piers

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An Analytical Study on Reduction of Stress Concentration at the Underhead Fillet in High-Strength Bolts

Kozo WAKIYAMA, Jinho KIM, Motohide TADA

pp. 53-58

DOI:

10.11273/jssc1994.2.53

Abstract

Fatigue fracture or delayed fracture often occurs at the threaded portion or the underhead fillet of high-strength bolts where the stress concentrates. In order to reduce the stress-concentration at the threaded portion, we have already proposed the improved thread shape. In this paper, the cone shape head is proposed to reduce the stress-concentration at the underhead fillet. The efficiency of this shape is analyzed by the FEM in which the parameters are the radius of the fillet and the angle of the bearing surface at the underhead.

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An Analytical Study on Reduction of Stress Concentration at the Underhead Fillet in High-Strength Bolts

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An Analitical Study on the Strength of Slender Filled Steel Tubular Columns (Comparison of Compressive Strength between Eccentric Axial Compression and 3 - Point Bending with Axial Compression)

Shigeki ITOH, Haruhito OKAMOTO, Hiroumi SHIMOKAWA

pp. 59-65

DOI:

10.11273/jssc1994.2.59

Abstract

Strength of slender composite columns subjected to axial force and bending moment is usually calculated as reduced strength from full plastic strength depended on slenderness ratio. In order to have the maximum strength of such columns, eccentric axial compression test mainly have been conducted. But actual distribution of bending moment of a column during earthquake is often different from the distributionunder such experimental loading condition. In this paper, the effects of the moment distributions or loading conditions on the strength of the composite slender columns are calculated by analytical procedure(CDC method). Comparison between experiments and calculations and between loading conditions are investigated and, it is concluded that nominal bending moment of 3-points bending condition is about 10-50 % higher than eccentric axial compression.

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An Analitical Study on the Strength of Slender Filled Steel Tubular Columns (Comparison of Compressive Strength between Eccentric Axial Compression and 3 - Point Bending with Axial Compression)

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