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DEVELOPMENT OF STEEL PLATE-BOLT JOINT SYSTEM FOR CLT HYBRID STRUCTURES: STRUCTURAL PERFORMANCE EVALUATION AND COMPONENT-LEVEL EXPERIMENT

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AIJ Journal of technology and Design 2024年第74期30卷 106-111页

作者： Aljuhmani, Ahmad Ghazi Matsumoto, Naoyuki Minegishi, Arata Goto, Yutaka Maeda, Masaki School of Engineering Tohoku Univ Japan Dept. of Architecture and Civil Engineering Chalmers Univ. of Technology Sweden

In this paper, a bolt-type steel joint system for CLT-steel hybrid buildings is proposed. The proposed connection consists of insertion steel plates and steel bolts with a large diameter that connect two CLT walls to steel beams. Evaluation methods to predict the structural performance of the connection are proposed and validated with component-level one-bolt connection tests. It was found that the methods can be used to predict the structural performance of the connection with good accuracy. The proposed connection can utilize the high strength and stiffness of CLT wall panels while maintaining an acceptable level of ductility. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Bolts

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INFLUENCE OF LAPS OF WELDED WIRE MESHES ON BENDING RESISTANCE AND FAILURES OF RC SLABS AT HIGH TEMPERATURE

Journal of Structural and Construction Engineering

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Journal of Structural and Construction engineering 2024年第823期89卷 1072-1081页

作者： Horie, Moe Seino, Akira Kanada, Haruka Kikuchi, Takayuki Totsuka, Marina Hirashima, Takeo Graduate School of Science and Engineering Chiba Univ Japan Technology Center Taisei Corporation Japan Faculty of Engineering Chiba Univ. Japan Graduate School of Engineering Chiba Univ. Japan

This paper describes influence of laps of welded wire mesh on bending resistance and failures of RC slabs at high temperatures by carrying out high temperature loading tests for one way RC slabs, varying the lap length and the temperature of the lap. The test result indicated that RC slabs for the lap length of the mesh interval plus 50 mm transfer sufficient tensile stress at the lap up to 550 °C and prevent brittle failure of the lap. Test result of the bending resistance is more than the calculation result determined by the yield stress of welded wire mesh. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Yield stress

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Experimental Study on Combustion Characteristics of Methane-Hydrogen Mixed Fuel in Small Circular Nozzle (1) - Flame Visualization

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Transactions of the Korean Society of Mechanical Engineers, B 2025年第5期49卷 255-269页

作者： Kim, Tae Hoon Son, Byeong Woo Ohm, In Young Dept. of Mechanical Engineering Graduate School Seoul Nat'l Univ. of Science and Technology Korea Republic of Dept. of Mechanical and Automotive Engineering Seoul Nat'l Univ. of Science and Technology Korea Republic of

To investigate the combustion characteristics of methane-hydrogen mixed fuel, flame visualization was performed using small nozzles with diameters of less than 3 mm in a Bunsen burner. The following conclusions were drawn from schlieren imaging, direct photography, and infrared analysis under various combustion conditions for low-hydrogen-fraction fuels. When the nozzle size is small, flame presence is primarily influenced by size effects, while the number of nozzles has minimal impact. The minimum nozzle diameter capable of sustaining combustion as a burner is approximately 3 mm. At a hydrogen fraction of 0.20 or higher, backfire may occur when the equivalence ratio and Reynolds number are low. Additionally, as the hydrogen mixing ratio increases, a flame is more likely to form under conditions of higher equivalence ratios and lower Reynolds numbers. Furthermore, increasing the hydrogen fraction results in a reduction in flame height and reaction zone size. However, when the difference in hydrogen fraction is small, individual flame fluctuations may exceed the average variation expected based on the fraction. © 2025 The Korean Society of Mechanical Engineers.

关键词： Mixed gas fuels

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Thermochemical Analysis of Methane-Hydrogen Mixing Fuel (1) - Exhaust Composition

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Transactions of the Korean Society of Mechanical Engineers, B 2025年第5期49卷 239-253页

作者： Song, Rak Hyoun Son, Byeong Woo Ohm, In Young Dept. of Mechanical Engineering Graduate School Seoul Nat'l Univ. of Science and Technology Korea Republic of Dept. of Mechanical and Automotive Engineering Seoul Nat'l Univ. of Science and Technology Korea Republic of

In this study, a thermochemical analysis was conducted to obtain the exhaust composition according to the mixing ratio of hydrogen with methane and a standard city gas. Calculations and analysis of the composition led to the following conclusions. With an increase in the hydrogen mixing ratio, the limit of maldistribution at which a reasonable composition could be obtained decreased, thereby reducing the distribution area of the exhaust composition. In particular, when the distribution heterogeneity increases in the range of 4.22 to 4.86 hydrogen-carbon atomic ratio, the exhaust composition was sensitive to small changes in the hydrogen atom ratio and changed significantly. In addition, regardless of the volume of hydrogen mixed, if the mal-distribution factor is not very large, the generation of hydrogen increased in the theoretical equivalence ratio. Altogether, changes in exhaust composition due to non-uniform distribution can be used as an indicator of actual combustion fluctuations that deviate from ideal combustion. © 2025 The Korean Society of Mechanical Engineers.

关键词： Differential thermal analysis

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STUDY OF FRACTURE LOAD AND MODE OF POST-INSTALLED ADHESIVE ANCHOR FIXED IN LARGE DIAMETER HOLE

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AIJ Journal of technology and Design 2024年第75期30卷 785-790页

作者： Gao, Hui Satoh, Ayumi School of Engineering Kumamoto Univ Japan Faculty of Advanced Science and Technology Kumamoto Univ. Japan

In this study, to further improve the performance of the adhesive anchors, pullout tests were conducted on adhesive anchors with different combinations of adhesive and borehole diameter to determine the maximum load along with the fracture type of the adhesive anchors. The load capacity calculated by AIJ’s current design guidelines was compared with the experimental fracture load. The results show that the maximum load of adhesive anchors fixed in large-hole with three types of adhesives are higher than the ones fixed in conventional-size-hole regardless of the fracture mode. AIJ’s current design criteria provide lower limits of fracture loads for them. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Fracture

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OUTLINE OF RECONNAISSANCE OF DAMAGED STEEL SCHOOL BUILDINGS DUE TO THE 2024 NOTO PENINSULA EARTHQUAKE

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AIJ Journal of technology and Design 2025年第77期31卷 264-269页

作者： Kishiki, Shoichi Iyama, Jun Kurosawa, Miku Nakada, Shotaro Tatsumi, Nobuhiko Sato, Yoshiharu Ishida, Takanori Matsumoto, Yuka Yamada, Satoshi Seike, Tsuyoshi IIR Institute of Science Tokyo Japan School of Engineering The Univ. of Tokyo Japan Toyohashi Univ. of Technology Japan Aichi Institute of Technology Japan Yokohama National University Japan Graduate School of Frontier Sciences The Univ. of Tokyo Japan

This paper reports an outline of reconnaissance results of 74 steel school buildings including 50 gymnasiums damaged by the 2024 Noto Peninsula Earthquake. The structural, non-structural, and overall damage have been ranked based on "Standard for Post-earthquake Damage Evaluation of Damaged Buildings". Structural damage similar to that reported in previous earthquakes was observed. On the other hand, some buildings were found to be rotated due to foundation damage. As for non-structural damage, severe damage caused by inappropriate connections was observed. However, the removal of ceilings in large spaces was indicated to be effective in reducing damage. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Gymnasiums

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CASE STUDY OF SPACE UTILIZATION AND WASTE REDUCTION IN BUILDINGS USING ULTRA-THIN PRECAST PRESTRESSED CONCRETE MEMBERS

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AIJ Journal of technology and Design 2025年第77期31卷 444-448页

作者： Hosoya, Jin Imamoto, Kei-Ichi Ridengaoqier, E. Kiyohara, Chizuru Dept. of Architecture Graduate School of Engineering Tokyo Univ. of Science Japan Dept. of Architecture Faculty of Engineering Tokyo Univ. of Science Japan Research Institute for Science & Technology Tokyo Univ. of Science Japan

This paper presents case study on implementing ultra-thin precast prestressed concrete members, with tension introduced by CFRP strand as prefabricated partition materials in architectural spaces. These members enhanced the efficiency of architectural spaces and significantly reduced waste materials at construction sites. The paper also discussed the mechanical properties of the thin-walled members through bending tests, demonstrating their high bending strength and safety as partition materials. Furthermore, implementation examples in a pediatric clinic have illustrated the practical benefits, including increased effective area, reduced construction time, and decreased waste. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Thin walled structures

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FEASIBILITY OF BOND BEHAVIOR EVALUATION OF FRP RODS FABRICATED BY 3D PRINTING

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AIJ Journal of technology and Design 2024年第76期30卷 1170-1175页

作者： Kawakami, Mayu Yasue, Ayumu Kim, Junho Kanematsu, Manabu Faculty of Science and Technology Tokyo Univ. of Science Japan Center of Construction Engineering Institute of Technology Shimizu Corporation Japan Dept. of Architecture Faculty of Science and Technology Tokyo Univ. of Science Japan

To clarify whether the bond behavior of FRP rods fabricated by 3DP can be evaluated, a pull-out test was carried out with CF incorporation rate and the height of ribs(H) to the spacing of ribs(L) (H/L). As a result, it was found that the effect of increasing CF incorporation rate on the improvement of FRP rod bond performance is small, and bond stress showed a different trend from that of reinforcing bars. In addition, it was suggested that the effect of H/L on bond stress in FRP rods can be evaluated by appropriating CF incorporation rate. © 2024 Architectural Institute of Japan. All rights reserved.

关键词： Bond FRP 3D Printer Ribs

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J-NECORA: A Framework for Optimal Resource Allocation in Cloud-Edge-Things Continuum for Industrial Applications With Mobile Nodes

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IEEE Internet of Things Journal 2025年第11期12卷 16525-16542页

作者： Pettorali, Marco Righetti, Francesca Vallati, Carlo Das, Sajal K. Anastasi, Giuseppe Univ. of Pisa Dept. of Information Engineering Italy Missouri Univ. of Science and Technology Dept. of Computer Science RollaMO United States

In the Industrial Internet of Things (IIoT) landscape, where the Cloud-to-Things Continuum (C2TC) paradigm is now a reality, industrial applications need to cope with highly heterogeneous network and computing resources. Moreover, many industrial applications also involve Mobile Nodes (MNs). Efficient allocation of network and computing resources to meet the stringent requirements of such applications is often a very challenging task. In this paper, we propose J-NECORA (Joint NEtwork and COmputing Resource Allocation), a comprehensive analytical framework to derive the optimal joint allocation of network and computing resources in the C2TC, that guarantees the application requirements, even in the presence of MNs. If the optimal allocation does not exist, J-NECORA provides a best-effort allocation that minimizes the delay. The proposed framework is highly modular and flexible, and can be easily customized to different scenarios. We validated its effectiveness through simulation experiments, focusing on a specific use case. For the considered scenarios, the performance predicted by our framework matches quite closely the simulation results. © 2014 IEEE.

关键词： Cloud platforms

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STUDY ON SEGREGATION RESISTANCE OF HIGH STRENGTH CONCRETE WITH ELECTRIC ARC FURNACE OXIDIZING SLAG FINE AGGREGATE

Journal of Structural and Construction Engineering

引用

Journal of Structural and Construction engineering 2025年第827期90卷 1-7页

作者： Yushi, Kato Satoshi, Watanabe Keiki, Yamamoto Tomoya, Nishiwaki Taisei Advanced Center of Technology Taisei Corporation Japan Graduate School of Engineering Tohoku Univ. Japan

Segregation resistance tests were conducted on concrete with electric arc furnace oxidizing slag fine aggregate (ES) or normal fine aggregate (NS) and, segregation index was evaluated. In addition, a method of estimating segregation index was investigated based on mix proportion and flesh test. As a result, coarse aggregate is floated in concrete with ES, and coarse aggregate is settled in concrete with NS due to the difference of density between mortar and coarse aggregate. Furthermore, the possibility estimating segregation index is shown based on density difference between mortar and coarse aggregate and arrival time of 200mm flow of mortar. © 2025 Architectural Institute of Japan. All rights reserved.

关键词： Mortar

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