Hiroshi Masuya | Kanazawa University (original) (raw)
Papers by Hiroshi Masuya
Journal of Japan Society of Civil Engineers, Ser. F4 (Construction and Management), 2016
MATEC Web of Conferences, 2015
The steel-concrete composite girder has been usually applied in the bridge and building structure... more The steel-concrete composite girder has been usually applied in the bridge and building structures, mostly consisting of concrete slab, steel girder, and shear connector. The current fatigue damage assessment for the composite girder is largely based on the strain values and concrete crack features, which is time consuming and not stable. Hence the vibration-based fatigue damage assessment has been considered in this study. In detail, a steel-steel fiber reinforced concrete (SFRC) composite girder was tested. The steel fiber reinforced concrete is usually considered for dealing with the concrete cracks in engineering practice. The composite girder was 3.3m long and 0.45m high. The fatigue load and impact excitation were applied on the specimen sequentially. According to the test results, the concrete crack development and global stiffness degradation during the fatigue test were relatively slow due to the favourable performance of SFRC in tension. But on the other hand, the vibration features varied significantly during the fatigue damage development. Generally, it confirmed the feasibility of executing fatigue damage assessment of composite bridge based on vibration method.
IABSE Conference, Nara 2015: Elegance in structures, 2015
Steel fiber reinforced concrete (SFRC) is characterized by its considerable tensile hardening cap... more Steel fiber reinforced concrete (SFRC) is characterized by its considerable tensile hardening capability. It has been applied in steel concrete composite bridges for improving the mechanical behavior. Shear connector is an important member in composite bridges, whereas the mechanical research of it in SFRC is rare. Therefore, push-out tests on the static and fatigue behavior of the frequently used stud connector in SFRC were executed. The tested stud shank diameter and height were 19 and 150mm. The steel fibers were mixed with concrete to compose SFRC. The aspect ratio of steel fiber was 48. The effect of SFRC on static behaviour of stud was not obvious according to the static push-out tests. However, the cyclic push-out test results showed that steel fibers in concrete could improve the fatigue behavior of stud especially when cyclic load range was small. So far, most of the current specification evaluations of stud behavior have not provide corresponding consideration of SFRC. Eng...
Doboku Gakkai Ronbunshu, 1992
Doboku Gakkai Ronbunshu, 1985
Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures), 2020
Journal of applied mechanics, 2004
Journal of applied mechanics, 2001
Journal of the Society of Materials Science, Japan, 2011
Natural Hazards and Earth System Sciences, 2010
The purpose of this research is to collect fundamental data and to establish a performance-based ... more The purpose of this research is to collect fundamental data and to establish a performance-based design method for reinforced concrete beams under perpendicular impact load. Series of low speed impact experiments using reinforced concrete beams were performed varying span length, cross section and main reinforcement. The experimental results are evaluated focusing on the impact load characteristics and the impact behaviours of reinforced concrete beams. Various characteristic values and their relationships are investigated such as the collision energy, the impact force duration, the energy absorbed by the beams and the beam response values. Also the bending performance of the reinforced concrete beams against perpendicular impact is evaluated. An equation is proposed to estimate the maximum displacement of the beam based on the collision energy and the static ultimate bending strength. The validity of the proposed equation is confirmed by comparison with experimental results obtained by other researchers as well as numerical results obtained by FEM simulations. The proposed equation allows for a performance based design of the structure accounting for the actual deformation due to the expected impact action.
Doboku Gakkai Ronbunshu, 2002
International Journal of Structural and Civil Engineering Research, 2019
A flexural experiment was conducted on the tested prestressed concrete girder using carbon fiber ... more A flexural experiment was conducted on the tested prestressed concrete girder using carbon fiber reinforced plastics (CFRP) tendons, which has the full scale of an actual one and was placed next to the main girders of Shinmiya Bridge in the corrosive environment nearly 30 years. In this study, the flexural behavior of this tested girder was investigated by the finite element method. A three-dimensional analysis model was built in LS-DYNA and analyzed by an explicit finite element program. The load-bearing capacity, load-deflection curve, and the crack pattern were evaluated in comparing with experimental results. The comparison result showed that there was a consistency between results obtained from the simulation and that obtained from the experiment of the tested girder in 2017. Based on this model, the decrease of pre-stressing force in the tendons, the reduction of the compression concrete strength were studied to evaluate the change in the behavior of the structure.
Doboku Gakkai Ronbunshu, 1990
Journal of Bridge Engineering, 2015
Abstract Clustering stud shear connectors with minimized spacing based on specifications to form ... more Abstract Clustering stud shear connectors with minimized spacing based on specifications to form group studs are useful for concrete slab prefabrication and prestress installation efficiency in steel-concrete composite bridges. To date, many long-span composite bridge girders have been designed with wide transverse cantilevers and web spacing, and most of these girders use group studs. The concrete’s self-weight and the weight of moving loads result in a significant transverse bending-induced effect generally consisting of bending stresses and tensile concrete cracks. In this sense, the studs are actually under longitudinal interlayer shear force that is influenced by the transverse bending-induced effect. This biaxial loading effect has not been investigated experimentally. Thus, standard and newly designed push-out tests and corresponding analyses were carried out. In addition, the stud arrangement effect also was of concern. In this study, the ratio of stud height to shank diameter was approximately 6....
International Journal of Protective Structures, 2014
Flexible fences have been used widely for protection against rockfall impact and have garnered co... more Flexible fences have been used widely for protection against rockfall impact and have garnered considerable attention from engineers and researchers due to their effectiveness and adaptability to various types of topography and impact energy magnitude. Generally, friction braking devices are widely used for absorbing impact energy and external support cables are added to enhance structure stability. The utilization of sand packs as impact absorbing components in the fence structure is considered a new and rational idea. This research was conducted to gain better understanding of the structural behavior of a fence without any braking device or external support cable, and the absorption performance of sand pack to cushion rockfall impact. The fence studied in this research consist of three spans of cable net covered by 14 sand packs, and was subjected to impact load by a vertical free fall of weight. The sand packs covering the fence were considered for a numerical study using the fin...
Applied Mechanics and Materials, 2011
In order to know efficiently the impact behavior of the actual size sand cushion under rock fall,... more In order to know efficiently the impact behavior of the actual size sand cushion under rock fall, to achieve a lot of impact experiments under various conditions or to analyze those phenomena by use of reliable accurate methods is generally required. However, there is difficulty in many cases to achieve experiments because of financial reason. Therefore, the analysis method to reproduce full-scale impact behavior is indispensable. From this point of view, we have developed Distinct Element Method. The method to model the body to collide like a rock fall by an assembly of many small elements and the method to present a sand cushion as an assembly of many elements which have different size with randomness were shown. The validity of this method was shown by the comparison with experimental results.
Structural Engineering International, 2009
Journal of Japan Society of Civil Engineers, Ser. F4 (Construction and Management), 2016
MATEC Web of Conferences, 2015
The steel-concrete composite girder has been usually applied in the bridge and building structure... more The steel-concrete composite girder has been usually applied in the bridge and building structures, mostly consisting of concrete slab, steel girder, and shear connector. The current fatigue damage assessment for the composite girder is largely based on the strain values and concrete crack features, which is time consuming and not stable. Hence the vibration-based fatigue damage assessment has been considered in this study. In detail, a steel-steel fiber reinforced concrete (SFRC) composite girder was tested. The steel fiber reinforced concrete is usually considered for dealing with the concrete cracks in engineering practice. The composite girder was 3.3m long and 0.45m high. The fatigue load and impact excitation were applied on the specimen sequentially. According to the test results, the concrete crack development and global stiffness degradation during the fatigue test were relatively slow due to the favourable performance of SFRC in tension. But on the other hand, the vibration features varied significantly during the fatigue damage development. Generally, it confirmed the feasibility of executing fatigue damage assessment of composite bridge based on vibration method.
IABSE Conference, Nara 2015: Elegance in structures, 2015
Steel fiber reinforced concrete (SFRC) is characterized by its considerable tensile hardening cap... more Steel fiber reinforced concrete (SFRC) is characterized by its considerable tensile hardening capability. It has been applied in steel concrete composite bridges for improving the mechanical behavior. Shear connector is an important member in composite bridges, whereas the mechanical research of it in SFRC is rare. Therefore, push-out tests on the static and fatigue behavior of the frequently used stud connector in SFRC were executed. The tested stud shank diameter and height were 19 and 150mm. The steel fibers were mixed with concrete to compose SFRC. The aspect ratio of steel fiber was 48. The effect of SFRC on static behaviour of stud was not obvious according to the static push-out tests. However, the cyclic push-out test results showed that steel fibers in concrete could improve the fatigue behavior of stud especially when cyclic load range was small. So far, most of the current specification evaluations of stud behavior have not provide corresponding consideration of SFRC. Eng...
Doboku Gakkai Ronbunshu, 1992
Doboku Gakkai Ronbunshu, 1985
Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures), 2020
Journal of applied mechanics, 2004
Journal of applied mechanics, 2001
Journal of the Society of Materials Science, Japan, 2011
Natural Hazards and Earth System Sciences, 2010
The purpose of this research is to collect fundamental data and to establish a performance-based ... more The purpose of this research is to collect fundamental data and to establish a performance-based design method for reinforced concrete beams under perpendicular impact load. Series of low speed impact experiments using reinforced concrete beams were performed varying span length, cross section and main reinforcement. The experimental results are evaluated focusing on the impact load characteristics and the impact behaviours of reinforced concrete beams. Various characteristic values and their relationships are investigated such as the collision energy, the impact force duration, the energy absorbed by the beams and the beam response values. Also the bending performance of the reinforced concrete beams against perpendicular impact is evaluated. An equation is proposed to estimate the maximum displacement of the beam based on the collision energy and the static ultimate bending strength. The validity of the proposed equation is confirmed by comparison with experimental results obtained by other researchers as well as numerical results obtained by FEM simulations. The proposed equation allows for a performance based design of the structure accounting for the actual deformation due to the expected impact action.
Doboku Gakkai Ronbunshu, 2002
International Journal of Structural and Civil Engineering Research, 2019
A flexural experiment was conducted on the tested prestressed concrete girder using carbon fiber ... more A flexural experiment was conducted on the tested prestressed concrete girder using carbon fiber reinforced plastics (CFRP) tendons, which has the full scale of an actual one and was placed next to the main girders of Shinmiya Bridge in the corrosive environment nearly 30 years. In this study, the flexural behavior of this tested girder was investigated by the finite element method. A three-dimensional analysis model was built in LS-DYNA and analyzed by an explicit finite element program. The load-bearing capacity, load-deflection curve, and the crack pattern were evaluated in comparing with experimental results. The comparison result showed that there was a consistency between results obtained from the simulation and that obtained from the experiment of the tested girder in 2017. Based on this model, the decrease of pre-stressing force in the tendons, the reduction of the compression concrete strength were studied to evaluate the change in the behavior of the structure.
Doboku Gakkai Ronbunshu, 1990
Journal of Bridge Engineering, 2015
Abstract Clustering stud shear connectors with minimized spacing based on specifications to form ... more Abstract Clustering stud shear connectors with minimized spacing based on specifications to form group studs are useful for concrete slab prefabrication and prestress installation efficiency in steel-concrete composite bridges. To date, many long-span composite bridge girders have been designed with wide transverse cantilevers and web spacing, and most of these girders use group studs. The concrete’s self-weight and the weight of moving loads result in a significant transverse bending-induced effect generally consisting of bending stresses and tensile concrete cracks. In this sense, the studs are actually under longitudinal interlayer shear force that is influenced by the transverse bending-induced effect. This biaxial loading effect has not been investigated experimentally. Thus, standard and newly designed push-out tests and corresponding analyses were carried out. In addition, the stud arrangement effect also was of concern. In this study, the ratio of stud height to shank diameter was approximately 6....
International Journal of Protective Structures, 2014
Flexible fences have been used widely for protection against rockfall impact and have garnered co... more Flexible fences have been used widely for protection against rockfall impact and have garnered considerable attention from engineers and researchers due to their effectiveness and adaptability to various types of topography and impact energy magnitude. Generally, friction braking devices are widely used for absorbing impact energy and external support cables are added to enhance structure stability. The utilization of sand packs as impact absorbing components in the fence structure is considered a new and rational idea. This research was conducted to gain better understanding of the structural behavior of a fence without any braking device or external support cable, and the absorption performance of sand pack to cushion rockfall impact. The fence studied in this research consist of three spans of cable net covered by 14 sand packs, and was subjected to impact load by a vertical free fall of weight. The sand packs covering the fence were considered for a numerical study using the fin...
Applied Mechanics and Materials, 2011
In order to know efficiently the impact behavior of the actual size sand cushion under rock fall,... more In order to know efficiently the impact behavior of the actual size sand cushion under rock fall, to achieve a lot of impact experiments under various conditions or to analyze those phenomena by use of reliable accurate methods is generally required. However, there is difficulty in many cases to achieve experiments because of financial reason. Therefore, the analysis method to reproduce full-scale impact behavior is indispensable. From this point of view, we have developed Distinct Element Method. The method to model the body to collide like a rock fall by an assembly of many small elements and the method to present a sand cushion as an assembly of many elements which have different size with randomness were shown. The validity of this method was shown by the comparison with experimental results.
Structural Engineering International, 2009