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Cargo tankers corrugated bulkheads are constantly subjected to excited vibration due to propulsion system components, such as engines, shafts and gear boxes, and severe vibration can be observed if the bulkheads vibrate in resonance with the excitation frequency. Added to it, the influence of the cargo density and the filling level at the cargo tank can lead to a considerable variation of the natural frequencies, shifting them closer to the excitation frequency and leading the system to a dangerous resonance state. In addition, vibration induced by the propulsion system is known for an extremely high number of load cycles in a short period of time. In a state of resonance, the effects of such cycles combined with huge amplitudes may negatively affect the design fatigue life, leading to fatigue induced cracks. In the course of this study, two main questions are supposed to be answered. First, how to design a proper corrugated cargo tank bulkhead in order to minimise resonance risks due to the excitation frequencies generated by the propulsion system? And second, to assess at which vibration levels fatigue damage is likely to occur. For that purpose, a parametric Finite Elements model is developed in order to analyze how the natural frequencies vary according to the variation of dimension parameters, cargo filling levels and cargo densities. In addition, the model is refined at the stress concentration areas for a fatigue strength analysis in order to determine the vibration levels and the stress range for which the fatigue damage is likely to occur.
Vibration --- Corrugated --- Bulkhead --- Fatigue --- Ingénierie, informatique & technologie > Ingénierie mécanique
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The series of International Symposiums on Mining with Backfill explores both the theoretical and practical aspects of the application of mine fill, with many case studies from both underground and open-pit mines. Minefill attendees and the Proceedings book audience include mining practitioners, engineering students, operating and regulatory professionals, consultants, academics, researchers, and interested individuals and groups.The papers presented at Minefill symposiums regularly offer the novelties and most modern technical solutions in technology, equipment, and research. In that way, the papers submitted for the Minefill Symposia represent the highest quality and level in the conference domain.For the 2020-2021 edition organizers hope that the papers presented in this publication will also be received with interest by readers around the world, providing inspiration and valuable examples for industry and R&D research.
Rock pressure. --- Mine filling. --- Rock mechanics --- Back-filling --- Goafing (Mining) --- Gobbing (Mining) --- Mine stowage --- Packing (Mining) --- Stowage, Mine --- Mining engineering --- Backfill reticulation --- bulkhead capacity --- geomechanics --- hazard and risk control --- Mines And Mineral Resources --- Civil Engineering --- Technology & Engineering
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The performance-based design of structures in fire is gaining growing interest as a rational alternative to the traditionally adopted prescriptive code approach. This interest has led to its introduction in different codes and standards around the world. Although engineers widely use performance-based methods to design structural components in earthquake engineering, the adoption of such methods in fire engineering is still very limited. This Special Issue addresses this shortcoming by providing engineers with the needed knowledge and recent research activities addressing performance-based design in structural fire engineering, including the use of hotspot analysis to estimate the magnitude of risk to people and property in urban areas; simulations of the evacuation of large crowds; and the identification of fire effects on concrete, steel, and special structures.
fire incidence --- hotspot analysis --- KDE --- Getis-Ord Gi* --- IDW interpolation --- fire risk zones --- built-up areas --- temporal analysis --- sustainable development --- fire --- earthquake --- finite element analysis --- Abaqus --- multi hazard analysis --- Scoria aggregate concrete --- PP fiber --- high temperature --- stress-strain curve --- prefabricated cabin-type substation --- panel --- BP neural network --- thermal–mechanical coupling --- machine learning --- fire behavior --- impact of fires --- repeated impact --- ACI 544-2R --- high temperatures --- ECC --- impact ductility --- oil and gas facility --- offshore platform --- tanker --- steel structure --- bulkhead --- deck --- hydrocarbon fire mode --- fire-resistance limit --- fire protection --- design --- stadiums and arenas --- evacuation time --- safety --- Colosseum --- organizing evacuation --- computer simulation --- City University --- fire temperature --- opening factor --- compartment area --- thermal analysis --- natural fire --- concrete strength --- exposure duration --- maximum temperature --- heating rate --- cooling rate --- reinforced concrete --- columns --- standard fire --- cooling phase --- axial capacity --- temperature-stress history
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The performance-based design of structures in fire is gaining growing interest as a rational alternative to the traditionally adopted prescriptive code approach. This interest has led to its introduction in different codes and standards around the world. Although engineers widely use performance-based methods to design structural components in earthquake engineering, the adoption of such methods in fire engineering is still very limited. This Special Issue addresses this shortcoming by providing engineers with the needed knowledge and recent research activities addressing performance-based design in structural fire engineering, including the use of hotspot analysis to estimate the magnitude of risk to people and property in urban areas; simulations of the evacuation of large crowds; and the identification of fire effects on concrete, steel, and special structures.
Research & information: general --- Mathematics & science --- fire incidence --- hotspot analysis --- KDE --- Getis-Ord Gi* --- IDW interpolation --- fire risk zones --- built-up areas --- temporal analysis --- sustainable development --- fire --- earthquake --- finite element analysis --- Abaqus --- multi hazard analysis --- Scoria aggregate concrete --- PP fiber --- high temperature --- stress-strain curve --- prefabricated cabin-type substation --- panel --- BP neural network --- thermal–mechanical coupling --- machine learning --- fire behavior --- impact of fires --- repeated impact --- ACI 544-2R --- high temperatures --- ECC --- impact ductility --- oil and gas facility --- offshore platform --- tanker --- steel structure --- bulkhead --- deck --- hydrocarbon fire mode --- fire-resistance limit --- fire protection --- design --- stadiums and arenas --- evacuation time --- safety --- Colosseum --- organizing evacuation --- computer simulation --- City University --- fire temperature --- opening factor --- compartment area --- thermal analysis --- natural fire --- concrete strength --- exposure duration --- maximum temperature --- heating rate --- cooling rate --- reinforced concrete --- columns --- standard fire --- cooling phase --- axial capacity --- temperature-stress history --- fire incidence --- hotspot analysis --- KDE --- Getis-Ord Gi* --- IDW interpolation --- fire risk zones --- built-up areas --- temporal analysis --- sustainable development --- fire --- earthquake --- finite element analysis --- Abaqus --- multi hazard analysis --- Scoria aggregate concrete --- PP fiber --- high temperature --- stress-strain curve --- prefabricated cabin-type substation --- panel --- BP neural network --- thermal–mechanical coupling --- machine learning --- fire behavior --- impact of fires --- repeated impact --- ACI 544-2R --- high temperatures --- ECC --- impact ductility --- oil and gas facility --- offshore platform --- tanker --- steel structure --- bulkhead --- deck --- hydrocarbon fire mode --- fire-resistance limit --- fire protection --- design --- stadiums and arenas --- evacuation time --- safety --- Colosseum --- organizing evacuation --- computer simulation --- City University --- fire temperature --- opening factor --- compartment area --- thermal analysis --- natural fire --- concrete strength --- exposure duration --- maximum temperature --- heating rate --- cooling rate --- reinforced concrete --- columns --- standard fire --- cooling phase --- axial capacity --- temperature-stress history
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