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

Kou kouzou rombunshuu Vol. 29 (2022), No. 114

  • EFFECT OF BOLT HOLE DIAMETER OF CONNECTED PLATE AND THICKNESS PROPORTION OF JOINT ON SLIP RESISTANCE OF FRICTIONAL TYPE BOLTED JOINTS WITH HIGH-STRENGTH COUNTERSUNK HEAD BOLTS

    pp. 114_1-114_10

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    DOI:10.11273/jssc.29.114_1

    Countersunk head bolts can secure thickness of corrosion preventive coating with its flat head and improve anticorrosive properties of bolted connections. In this study, for utilizing its advantages in various type connections, FEA was conducted to investigate effect of bolt hole diameter of connected plate and thickness proportion of the joint with it on frictional slip resistance. From numerical results, it’s found that relationship between slip coefficient and slip/yield resistance ratio shows similar tendency in cases of countersunk and hexagonal bolt, and the tendency is evaluated by existing equation of hexagonal bolted joint. Decreasing behavior of bolt tensions is different in two bolt type. The effect of oversized hole is small.
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  • ANALYTICAL STUDY ON PATCH PLATE REPAIR EFFECTS FOR STEEL I-GIRDER BRIDGES WITH CORROSION DAMAGES CONSIDERING ITS BRIDGE SYSTEM BEHAVIOR

    pp. 114_11-114_22

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    DOI:10.11273/jssc.29.114_11

    Bridges are composed by many structural members which interact with each other to resist against various load combinations. In the present study, a full-scale FE analysis has been conducted for a steel I-girder bridge system with corrosion damages which have been repaired. The analysis considered, the bridge system behavior, varying the repaired areas and the shape of patch members. From the analytical results, it was found that, reinforcing the adjacent healthy girder in addition to the corroded girder was effective. Furthermore, when reinforcing the adjacent healthy girder in addition to the corroded girder, it is desirable to determine the shape of the plate based on the cross-sectional area ratio of the corroded girder and the adjacent healthy girder.
  • FORMULATION OF STRUCTURAL CHARACTERISTICS OF STEEL FRAMES WITH STUDS AND UTILIZATION OF THE FORMULA

    pp. 114_23-114_36

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    DOI:10.11273/jssc.29.114_23

    In this paper, we present the basic structural characteristic of steel frames with studs. Specifically, the structural characteristics to be presented are restoring force characteristics (Qδ relationship), damping characteristics (equivalent damping constant). First, we formulate the structural characteristics of steel frames with studs cut out from a continuous frame. Next, the structural characteristics of the steel frame with studs in the flayer is formulated. Finally, by using the formalized calculation formula we present a method of using steel frames with studs as hysteretic dampers. In use, the existing earthquake response constrained design method is applied.
  • ANALYTICAL STUDY ON SLIP BEHAVIOR AND COMPOSITE EFFECT FOCUSING ON THE JOINT STRUCTURE BETWEEN CAST IRON DECK MODULES AND STEEL MAIN GIRDER

    pp. 114_37-114_46

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    DOI:10.11273/jssc.29.114_37

    The cast iron deck modules is a lightweight deck slab with excellent fatigue resistance. Friction joint are used to join the cast iron deck modules and the main girder. In this study, the effect of the structural type of the support member between the deck and the girder on the slip behavior and composite effect are investigated by FE analysis. As a result, the reduction rate of the slip coefficient due to the difference in shape of the support member between the cast iron deck module and the main girder was evaluated from the coefficient calculated by multiplying the friction coefficient by the correction coefficient of slip coefficient.
  • EXPERIMENTAL AND ANALYTICAL STUDY ON ESTIMATION OF REACTION FORCE BY STRAIN MEASUREMENT OF STEEL GIRDER

    pp. 114_47-114_56

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    DOI:10.11273/jssc.29.114_47

    If a severe earthquake strike a steel bridge bearing, and the bridge loses its function, it is necessary to restore the function of the bridge as soon as possible. However, in the 2016 Kumamoto Earthquakes, strong earthquakes occurred continuously in a short period, so it is desirable to adopt a reinforcement structure that appropriately reflects the measured stress of the bridge, even for emergency repair reinforcement. In this study, we investigated a method for estimating the fulcrum reaction force with high accuracy by measuring the change in external force during temporary receiving jack-up with a strain gauge by a test using a reduced model of a steel girder.
  • ANALYSIS OF CREEP BEHAVIOR OF HIGH YIELD POINT STEELS YP400, YP500 COLUMNS AT ELEVATED TEMPERATURES

    pp. 114_57-114_68

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    DOI:10.11273/jssc.29.114_57

    This paper develops a methodology to investigate the creep behavior of high yield point steels YP400 and YP500 at high temperatures using the finite element program Abaqus. The creep models developed in this study were based on a series of tensile tests conducted under constant temperature conditions. The thermal expansion coefficients of the steels have been identified from the column test results. In addition, a user subroutine CREEP was developed to perform a more precise analysis of material creep effects. The effects of plastic properties, thermal properties, and initial imperfection on the time-dependent behavior of high yield point steels have been investigated. It was found that creep must be properly considered to accurately simulate the behavior of the YP400 and YP500 steel columns at elevated temperatures analytically.
  • Experimental study for extending the time interval between blasting and Al-5Mg alloy spraying

    pp. 114_69-114_78

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    DOI:10.11273/jssc.29.114_69

    In this study, we experimentally investigated the possibility of extending the time interval between blasting and Al-5Mg alloy spraying, which should be less than 4 hours according to the current guideline. In the experiment, three rust-preventive agents were applied to the surface of the steel material after blasting to try to suppress flash rust. In addition, a combined cyclic corrosion test of the specimens alloy-sprayed 48 hours after blasting was conducted for 6000 hours to verify their corrosion resistance. The experimental results suggest that the time interval between blasting and alloy spraying can be extended to 48 hours.

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