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Kou kouzou rombunshuu Vol. 16 (2009), No. 62

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

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28 May. (Last 30 Days)

Kou kouzou rombunshuu Vol. 16 (2009), No. 62

Reducing Traffic-induced Vibration of a Steel Truss Bridge by means of No-joint Method

Naomi NAMATAME, Chul-Woo KIM, Akihide HATANAKA, Mitsuo KAWATANI

pp. 62_1-62_10

DOI:

10.11273/jssc.16.62_1

Abstract

This paper presents an investigation for reducing traffic-induced vibration of a steel truss bridge by means of the no-joint method which renders bumps on expansion joints of bridges to be flat and, as a result, reduces the impulsive energy generated from vehicles. In this study, effectiveness of the no-joint method as a countermeasure against the vibration radiated from joints is confirmed through out dynamic response analyses under a moving vehicle. The successful reduction of the vibration between 10Hz and 20Hz observed from the analytical investigation encourages the use of the no-joint method to an actual steel truss bridge. The experimental investigation by comparing the responses before and after the no-joint method demonstrates effectiveness of the method even under usual traffic condition.

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Reducing Traffic-induced Vibration of a Steel Truss Bridge by means of No-joint Method

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Shear-bending cyclic loading tests of shear-yield-precedence beam

Yukihiro HARADA, Koji MORITA, Asuka HOTAKA, Shigeru YOSHIKAI, Yoshio FUKADA, Yoshikazu SAWAMOTO

pp. 62_11-62_25

DOI:

10.11273/jssc.16.62_11

Abstract

Shear-bending cyclic loading tests were performed to investigate structural behavior of shear-yield-precedence short-span beam. Main test parameters are the following: beam-end connection detail (only welded or both welded and bolted connection), design principle (designed only for bending or for bending and shear), and beam web detail (stiffened by web stiffeners or with reinforced web openings). Beam-end weld connections do not fracture in the all specimens, and the all test specimens showed good plastic deformation capacity because shear yielding of the web occurred prior to shear buckling; all the test results support feasibility of shear-yield-precedence design of short-span beam.

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Shear-bending cyclic loading tests of shear-yield-precedence beam

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Experimental Study on Buckling Strength of Angle Steel Compression Members with Built-up Bracing

Hiroshi KOMATSU, Keigo ISHII, Akio FUKUSHIMA

pp. 62_27-62_34

DOI:

10.11273/jssc.16.62_27

Abstract

In the desert area of Libya, an incident involving the collapse of several telecommunication towers became a very serious problem. Such incidents can be prevented by taking adequate measures to strengthen the tower structures. However, most towers that needed to be reinforced are located in the middle of the desert with frequent harsh windy conditions and are difficult to reach. Any construction work at these locations faces great challenges in mobilization of heavy equipment as well as materials and personnel. Therefore, it was essential that any remedial measure should be simple and easy to undertake. In this paper, we present a new structural steel reinforcement methodology that is both simple and easy to implement, but yields effective and guaranteed results. It does not require any drilling or welding of the existing tower structures. Such new and innovative methodology have now been employed in the Libyan Desert, which were extensively tested and found to be very effective and resulted in significant savings to the clients.

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Experimental Study on Buckling Strength of Angle Steel Compression Members with Built-up Bracing

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Study on retrofit measures in weld of vertical stiffener cutting treating of the semicircle in orthotropic steel deck

Yoshihiko TAKADA, Yoriko KAWAKAMI, Yuji SAKAI, Masahiro SAKANO

pp. 62_35-62_46

DOI:

10.11273/jssc.16.62_35

Abstract

Fatigue cracks were detected on welded joints between vertical stiffeners and orthotropic deck plate in 30 span of Hanshin Expressway bridges. This paper describes about study on retrofitting measures in weld of vertical stiffener cutting treating of the semicircle in orthotropic steel deck. At first, FEM analysis was conducted in order to evaluate the effect of stress reduction in this area by semicircle notching. Next, loading test using real size specimen was carried out. Finally, proposed retrofitting measures: semicircle notching was conducted on vertical stiffener of a bridge in the Hanshin Expressway and actual stress reduction effect was evaluated.

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Study on retrofit measures in weld of vertical stiffener cutting treating of the semicircle in orthotropic steel deck

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STUDY ON DUCTILITY OF AGED RAIL COLUMNS OF RAILWAY TRANSFER OVERBRIDGE

Satoshi SAITO, Shinji KUDO, Naoto TSUCHIYA, Fumio NAGASHIMA

pp. 62_47-62_58

DOI:

10.11273/jssc.16.62_47

Abstract

For evaluating seismic resistance of railway transfer overbridges constructed with reused aged rails, we investigate the deformation properties and M-φ relationships of axially loaded aged rail columns by conducting cyclic loading tests. Using four kinds of different aged rails of the product year (1888, 1895, 1922 and 1925) and different product countries, we perform forced deformation bending test around both of weak and strong axes for each aged rail columns. As the results of this experimental study, we obtain hysteresis curves and M-φ relationships which is available for practical use of evaluating seismic performance. In this manner, it is possible to evaluate the ductility of aged rail columns accurately.

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STUDY ON DUCTILITY OF AGED RAIL COLUMNS OF RAILWAY TRANSFER OVERBRIDGE

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Maximum Story Drift Angle Response of Steel Frames having Different Strength and Stiffness in Two Orthogonal Structural Planes

Takashi KIHARA, Mitsutoshi FUKUDA, Koji OGAWA

pp. 62_59-62_73

DOI:

10.11273/jssc.16.62_59

Abstract

This research is concerned with the seismic response of the 3-dimensional frames. Analyses were carried out by using bidirectional ground motion transformed into the directions of strong and weak axes. The maximum story drift angle caused in an arbitrary direction when bidirectional ground motion was inputted along all the directions can be almost approximated by the maximum value among the responses when only the strong-axis ground motion was inputted along the direction of the structural plane and the responses when only the strong-axis ground motion was inputted along the direction where the strength of the frame is the maximum.

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Maximum Story Drift Angle Response of Steel Frames having Different Strength and Stiffness in Two Orthogonal Structural Planes

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DEVELOPMENTAL STUDY ON INORGANIC AND ORGANIC ZINC-RICH PAINT WITH HIGH SLIP FACTOR FOR HIGH STRENGTH FRICTION GRIP BOLTED JOINTS

Yohei KOIKE, Toshihiro KASUGAI, Mitsuru ICHIMIYA

pp. 62_75-62_84

DOI:

10.11273/jssc.16.62_75

Abstract

In this study, for rationalization of high-strength friction grip bolted joints (hereinafter called H.S.F.G. bolted joints) in rationalized plate girder bridges, organic and inorganic zinc-rich paints with high slip factor were developed and their slip factor, relaxation characteristics and durability were examined through some kinds of performance tests. Furthermore as results of tentative calculations the number of high-strength bolts, painting area and weight of splices can be reduced compared with conventional design by using developed paint with high slip factor.

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DEVELOPMENTAL STUDY ON INORGANIC AND ORGANIC ZINC-RICH PAINT WITH HIGH SLIP FACTOR FOR HIGH STRENGTH FRICTION GRIP BOLTED JOINTS

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