Kou kouzou rombunshuu
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ONLINE ISSN: 1884-0329
PRINT ISSN: 1880-9928

Kou kouzou rombunshuu Vol. 7 (2000), No. 26

  • Development of Ultrasonic Automatic Inspection Equipment for bridge welding

    pp. 1-12

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    DOI:10.11273/jssc1994.7.26_1

    Japan, the X-ray Test method has been applied for many years in the examination of welding. However, the Ultrasonic Test is more suitable for the welding of thick plate over 50mm. To increase the reliability of the Ultrasonic Test, it is necessary to improve the method of recording and also to improve the reproducibility of the result for examination. This paper will describe the newly developed Ultrasonic Test equipment which is capable of recording all of the examined data automatically. In addition, the paper will deal with the results of studies carried out to examine the accuracy of the equipment. In conclusion, the newly developed equipment displays high performance in the areas of speed, accuracy and reproducibility. Furthermore, the performance of the equipment to judge a welding defect can be confirmed by combination with the TRFD method.
  • Investigation on MAG Welding Wires for Building Structure

    pp. 13-25

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    DOI:10.11273/jssc1994.7.26_13

    The objective of this investigation was to research the effects of type of MAG welding wire, heat input, and interpass temperature on the mechanical properties of weld metals, intending to use for the column-to-beam joints. The most suitable type of wire for the joints was a 540N/mm2-class wire featuring higher strength and toughness when compared with conventional 490N/mm2-class wires. Proper ranges of heat input and interpass temperature for 400N/mm2- and 490N/mm2-class steels were also found.
  • Calculating Method of Hot Spot Stress in Welded Plate Type Structures for Fatigue Assessmen

    pp. 27-34

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    DOI:10.11273/jssc1994.7.26_27

    A hot spot stress (HSS) concept is expected to be widely used in a fatigue assessment of welded steel structures. In order to establish a HSSdefinition and fatigue design procedure, finite element analyses were conducted on a plate model with a welded gusset. Then, various HSS calculation methods were examined. As a result, it was revealed that existing calculation methods such as two-point method and one-point method bring relatively large errors hen plate thickness becomes large. Considering the width of local stress oncentration, a new two-point method has been proposed in this paper. Furthermore, the fatigue strength grades in the existing fatigue design recommendations were compared with the HSS values.
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  • A study on a earthquake resistant of single layer latticed domes stiffened with cables and struts.

    pp. 35-42

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    DOI:10.11273/jssc1994.7.26_35

    The purpose of this paper is to study on a earthquake resistant of singlelayer latticed domes stiffened with cables and struts. The roof frame is a 100-m span. A proportioning method for member sections based on second-order elastic analysis is used. And dynamic analysis are calculated by elastic linear on upper structure, and elastoplastic on lower structure time-domain analysis adopting one acceleration records of El centro-S.
  • Study on Ultimate Strength and its Evaluation Method of Steel Compression Plates with Rounded Part

    pp. 43-49

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    DOI:10.11273/jssc1994.7.26_43

    Thos study deals with the ultimate strength and method for evaluating that of steel compression plates with a rounded part through the elasto-plastic and finite displacement analysis based on a finite element method. In this analysis, the residual stness distnbution idealized on the basis of the data measured in a steel stiffened stub column with rounded corners is considered . Main parameters of the analysis are the modes of initial deflection, radius-to-thickness ratio of a rounded part and breadth of flat parts . Finally, from the results of the analysis, the method for evaluating the ultimate strength and the appropriate location of longitudinal stiffeners for the stiffened stub columns with rounded corners are proposed
  • Flexural Strength of Beam Web to Square Tube Column Joints

    pp. 51-58

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    DOI:10.11273/jssc1994.7.26_51

    This paper presents a method of evaluating the flexural strength of a beam web joint connected to a square tube column, considering the out-of-plane deformation of the column flange. The ultimate flexural strength is obtained by applying the yield line theory to a combination of the collapse mechanisms of the column flange and the beam web end. A simple design formula is lead from the obtained solution, and its accuracy required for the practical design is confirmed by the results of both loading tests and numerical analyses. The design formula evaluating the yield strength of the beam end connection is also indicated and its validity is verified.
  • Estimation of Elastic-Plastic Behavior of Beam to-RHS Column Connection without Diaphragm

    pp. 59-72

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    DOI:10.11273/jssc1994.7.26_59

    The purpose of the present paper is to show how to estimate an elastic-plastic behavior of to-RHS column connection without diaphragm. The elastic-plastic behavior o such connection is regarded as not rigid, but semi-rigid, because out-of-plane deformation in column flange cannot be neglected; the behavior of the connection is analytically model as non-linear rotational spring at beam-ends. In this paper, properties of the rotational spring, tangent s ' ess and maximum strength, are determined by numerical analysis based on yield line theory d finite element analysis, and estimating equations for the properties are proposed. The connection with horizontal haunch at beam flange and the one partially thickened at column flange are also considered.
  • Failure Modes and Ultimate Strength of Tension Angles Jointed with High-Strength Bolts

    pp. 73-81

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    DOI:10.11273/jssc1994.7.26_73

    In low-rise steel structures, tension angles are widely adopted for earthquake resistance. Failures of the tension angles at joints with high-strength bolts have three modes: net section fracture, end fracture, and outer tearing fracture. In the current design method, the ultimate strength of the joints is supposed to be examined only for the net section fractures and the end fractures. But, the design values obtained by this method are not always accurate for edge distances and arrangements of bolt holes. Furthermore, as the outer tearing fractures actually occur in tension angles, in addition to these other two fracture types, we need to make a design formula for the outer tearing fracture. In this research program, we examine experimentally the effects of the bolt-hole arrangement and edge distance of the bolted joints on the ultimate strength of the tension angles and the failure modes. We propose formulas to predict the ultimate strength of joints for the net section and the outer tearing failure modes.

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