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

Kou kouzou rombunshuu Vol. 28 (2021), No. 109

  • JOINT OPENING BEHAVIOR OF HIGH-STRENGTH BOLTED CONNECTION WITH BOLTING THE JOINT

    pp. 109_1-109_8

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    DOI:10.11273/jssc.28.109_1

    Fatigue cracks are often repaired by the combination of drilled crack arrester (stop-hole) and patch plate with high-strength bolts. However, even in this method, cases of re-initiation of fatigue crack have been reported. Therefore, the authors propose the new technique to reduce the stress concentration of stop-hole more by bolting the crack for the patch plate repair method. In this study, the joint opening behavior of high-strength bolted connection was investigated by the FE analysis as the fundamental research. As a result, it was shown that the joint opening displacement becomes smaller and slip strength becomes higher by bolting the joint. Furthermore, it was also shown that the stress concentration of stop-hole repaired with patch plate is further reduced compared with the conventional method by bolting the crack.
  • FUNDAMENTAL STUDY ON CRACK DETECTION METHOD OF STEEL MEMBERS BY THERMAL LOADNG OVER PAINT COATING

    pp. 109_9-109_22

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    DOI:10.11273/jssc.28.109_9

    Fatigue cracks of steel structures, which may bring significant damage on bridge safety, occur at near welded lines and at around sole plate. Early detection and repair of them can be a key and researches have eagerly been conducted to develop easy defect detection techniques of them. Here, infrared thermography can be a means for inspecting defects and can be considered having potential used in practice. Then in this study, effects of shapes and locations of crack tips on crack detection method using the infrared thermography over paint coating are investigated through heat transfer analysis, and the validity is also verified through heating test of steel members with crack.
  • ADAPTIVE VIBRATION CONTROL OF NONLINEAR STEEL STRUCTURES USING DISPLACEMENT-DEPENDENT MASS DAMPER

    pp. 109_23-109_30

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    DOI:10.11273/jssc.28.109_23

    This paper proposes a nonlinear tuned mass damper (TMD) for reducing seismic damage to steel structures. This nonlinear TMD can be adaptively tuned according to the nonlinearity of a structure in terms of equivalent frequency. For optimized TMDs, numerical examples are demonstrated using simulated ground motions and historical earthquakes. The time history analysis shows that the proposed TMD holds satisfactory supplemental damping to buildings beyond its elastic range. The peak responses are well predicted using a proposed method based on the response spectrum method.
  • Mechanical Behavior of Steel-Concrete Composite Beam Using Hat Shaped Steel Section

    pp. 109_31-109_46

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    DOI:10.11273/jssc.28.109_31

    Steel-Concrete composite beam (SC beam) using hat shaped steel section has been developed by authors. Appling the beam makes it possible to reduce or omit shear reinforcements, reinforcements for web openings and concrete form shorings. These advantages lead to reduction of construction cost and labor saving. In this study, loading tests of SC beam using hat shaped steel section are conducted to verify the structural performance of initial state to ultimate state. This paper also proposes evaluation methods for allowable strength under longterm loading and ultimate strength. It is verified by comparing with loading test results that the proposed evaluation methods are reasonable.
  • Slip Resistance Tests of Friction-Type High-Strength Bolted Joints with One Faying Surface Roughened by Various Power Tools and the Other Painted by Inorganic Zinc-Rich Paint

    pp. 109_47-109_62

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    DOI:10.11273/jssc.28.109_47

    According to the Specifications for Highway Bridges, the slip coefficient of high-strength bolted friction type joints is specified as 0.4 when both of faying surfaces of the base metal and the splice plate are rough steel surface, and it is 0.45 when both surfaces are painted with inorganic zinc rich paint. In this study, slip tests were carried out for the joint whose splice plates are painted with the inorganic zinc rich paint of a thickness more than 100 μm and base plates have rough steel surfaces by different power tools. As a result, the slip coefficient was found to be more than 0.5 for all specimen types.
  • ANALYTICAL INVESTIGATION OF PATCH PLATE FLEXURAL STRENGTHENING EFFECT AND ITS REQUIRED LEGNTH FOR STEEL MAIN GIRDER WITH A FIELD CONNECTION

    pp. 109_63-109_78

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    DOI:10.11273/jssc.28.109_63

    Strengthening of the steel main girder by patch plate is standardly used in redecking. In the case of strengthening across the field connection, patch plate needs processed like a bypass structure, however, strength effect is not clarified. In addition, strength length to achieve sufficient strength effect is not known. Thus, analytical investigation is conducted to clarify the strength effect of bypass structure and, to suggest the required strength length of patch plate. Based on the results, bypass structure decreases nearby panel web’s neutral axis, thus it needs to extend more than 1.5 panel from connection. Furthermore, patch plate needs to extend more than 1.5 panel from the end of required strength length to achieve strength effect.
  • COLLAPSE TEMPERATURES OF STEEL PLANE FRAMES CONSIDERING FIRE SPREADS

    pp. 109_79-109_88

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    DOI:10.11273/jssc.28.109_79

    In this paper, collapse temperature of steel plane frames considering fire spreads are discussed by using numerical analyses based on nonlinear finite element methods with beam elements. The steel frames subjected to the horizontal fire spread in the same floor and the vertical fire spread to the upper story are used for the numerical analyses, respectively. From the numerical results, it was clarified that the fire spread in the frame did not have the significant influence on both collapse temperatures and load redistribution capacities for the steel frame.
  • DESIGN METHOD OF ADDITIONAL DAMPING USING CONTINUOUSLY ARRANGED VELOCITY-DEPENDENT DAMPERS IN HIGH-RISE STEEL STRUCTURES

    pp. 109_89-109_102

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    DOI:10.11273/jssc.28.109_89

    This study focus on the design of the velocity-dependent dampers in high-rise steel structures against long-period and long-duration ground motions,which is not involved in the conventional building design guidelines. According to the static calculations, the effective deformation of the dampers can be calculated and the results of elastic dynamic analysis can be predicted. Based on these results, it is possible to determine how much damping should be placed in structures. It also proves the validity of this study through the case studies of the planar frame model.
  • ANALYTICAL STUDY ON REMAINING PERFORMANCE OF CORROSION DAMAGED CABLE-STAYED STEEL BRIDGE WITH A FEW CABLES

    pp. 109_103-109_116

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    DOI:10.11273/jssc.28.109_103

    Recently, corrosion has been found in cables of cable system bridges. In the case of cable-stayed bridges with a few cables, corrosion may occur to collapse the bridge, therefore it is necessary to evaluate the remaining performance of the bridge. In this study, bridges under service condition are reproduced using FE analysis, and two analyzes are performed. First is corrosion analysis which was carried out reducing the cross section of the cable gradually. Second is loading capacity analysis which was carried out by gradually increasing the load. These two analyzes show the mechanical behavior of the targeted cable-stayed steel bridge with corroded cables.
  • STUDY ON STRENGTH AND STIFFNESS OF NON-DIAPHRAGM STEEL TUBES USED WITHIN RC COLUMN-STEEL BEAM JOINTS

    pp. 109_117-109_129

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    DOI:10.11273/jssc.28.109_117

    The purpose of this study is to clarify strength and stiffness for nondiaphragm steel tubes used within RC column-Steel beam joints. This paper presents the results of tensile test for element specimens of the steel joint. The specimen consists of a nondiaphragm steel tube and steel beam flanges for the sake of deformation behavior in the outof-plane direction of the non-diaphragm steel tube. Moreover this paper presents the validity and practicality of the proposal estimate equations for plastic strength, maximum strength and stiffness of the specimens under tensile load by using of yield line theory and FEM analysis in order to use of evaluating strength and stiffness of the steel joint within the RC column.
  • FLEXURAL SHEAR PERFORMANCE OF CONCRETE-FILLED BOX SECTION COLUMN MADE OF ULTRA-HIGH STRENGTH STEEL ASSEMBLED BY UNDERMATCHED WELDS

    pp. 109_131-109_144

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    DOI:10.11273/jssc.28.109_131

    The purpose of this study is to clarify the structural performance of concrete-filled box section columns made of ultra-high strength steel (H-SA700B) assembled by undermatched welds. For this purpose, we conducted experiments in which a constant axial force and repeated horizontal forces were applied to the top of a cantilever type column specimen. Experimental parameters include width-to-thickness ratio, axial force ratio and others. In all cases, a pair of specimens, undermatched and overmatched weld, was prepared. Based on the results, it is revealed that a concrete-filled box section column assembled by undermatched welds has the sufficient performance for practical use. Furthermore, the evaluation methods for short-term allowable strength and ultimate strength were proposed.
  • IMPROVEMENT OF SIMPLE EVALUATION METHOD FOR DUCTILE CRACK INITIATION IN STIFFENED BOX-SECTIONAL STEEL BRIDGE PIERS BY PUSHOVER ANALYSIS

    pp. 109_145-109_154

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    DOI:10.11273/jssc.28.109_145

    This study is aimed at improving a simple method for evaluating ductile crack initiation in stiffened box-sectional steel bridge piers by employing the pushover analysis. Following an idea presented in a previous paper, a new modification factor is proposed to obtain the critical ductile crack initiation strain at structural level, which will be used as a failure criterion in the simple evaluation method. Comparisons with results from the shell analysis show that the advanced method is of almost the same accuracy as a pushover analysis-based method in the previous paper. Moreover, its applicability is verified by experimental results.
  • SIMPLIFIED ANALYSIS METHOD FOR ESTIMATION OF STRAIN AT DRILLED CRACKARREST HOLE WITH BOLTED SPLICES

    pp. 109_155-109_168

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    DOI:10.11273/jssc.28.109_155

    The drilled crack-arrest hole and the attaching splices by high strength bolts are often used in combination as retrofit for fatigue cracks in steel structures. In this case, in order to evaluate the remaining fatigue life, it is important to accurately estimate the strain at the crack-arrest hole. Non-linear FE analysis considered the friction contact was often applied for the strain estimation in previous researches. In this study, a linear analysis model with simplified meshing was newly introduced. Through static loading tests and parametric FE analyses, it was verified that the model can estimate the strain at the hole with practically sufficient accuracy.
  • Experimental Study on Welded Joints of Dissimilar Strength Steels at the Corner Portion of Butt Welding between Cold-Formed Square Hollow Section Tube and Through-Diaphragm

    pp. 109_169-109_182

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    DOI:10.11273/jssc.28.109_169

    This paper describes an experimental survey for the corner portion of the butt welding joints between through diaphragm-to-cold-formed square hollow section tube.The strength of the tube's steel tends to be increased due to cold working at the corner portion; that may lead to undesirable fracture of the through diaphragm plate, whose strength becomes lower than those of the tube. Tensile and bending tests were carried out for the cruciform joint with CJP weld to verify the strength and fracture behavior. On the premise of the effect of the protrusion of through diaphragm, the test results show that the joint's fracture behavior can be explained by the height of the reinforcement metal and strength ratio of the diaphragm-to-the column tube.
  • CHARPY IMPACT TESTS ON LOW-YIELD POINT STEEL SUBJECTED TO THERMAL CYCLE AND PRE-STRAIN

    pp. 109_183-109_190

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    DOI:10.11273/jssc.28.109_183

    Low-yield point steel has been used in seismic control dampers due to its high energy absorption ability. Meanwhile, thermal cycle during welding can change mechanical properties and microstructure of low-yield point steel. In addition, large plastic strains caused by seismic motion can induce defects in microstructure. They can cause the reduction in toughness of the low-yield point steel. In this study, Charpy impact tests were performed for low-yield point steel with thermal cycle simulating heat affected zone and preliminary plastic strain. Significant reduction in Charpy absorbed energy was observed when applying simulated thermal cycle, while the preliminary strain gives insignificant reduction.

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