Metal Foam-Filled Tubes as Plastic Dissipaters in Earthquake-Resistant Steel Buildings

Ghiani, Cristina A.; Linul, Emanoil; Porcu, Maria Cristina; Marșavina, Liviu; Movahedi, Nima; Aymerich, Francesco

doi:10.1088/1757-899x/416/1/012051

Cited by 12 publications

(7 citation statements)

References 18 publications

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“…N j × EF sg,j + R × 0.012 (9) where N j is the amount of equipment of type j; EF sg,j is the emission factor of jth equipment; R is the number of workdays; 0.012 is the estimated value of carbon emission of a person per day; and n is the number of equipment types. The original frame is collapsed and the retrofitted frame is in a repairable state under a rare earthquake.…”

Section: Sustainability Analysis For the Proposed Methodsmentioning

confidence: 99%

“…In terms of economic benefit and environmental sustainability, the best choice is to retrofit existing structures rather than demolish them and rebuild new ones. Among many retrofitting methods [4][5][6][7][8][9][10][11], the placement of viscous dampers may be one of the easy ways to improve the seismic performance of structures, because it only induces limited downtime. To date, many studies have focused on the retrofitting of structures with viscous dampers.…”

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confidence: 99%

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Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Zhang

2019

Applied Sciences

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Featured Application: The study can be used for retrofitting frame structures to satisfy a revised seismic design code, where a building site had a low seismic hazard but now has a high seismic hazard. Abstract:The study proposes a retrofitting method with an optimum design of viscous dampers in order to improve the structural resistant capacity to earthquakes. The retrofitting method firstly uses a 2D frame model and places the viscous dampers in the structure to satisfy the performance requirements under code-specific design earthquake intensities and then performs an optimum design to increase the structural collapse-resistant capacity. The failure pattern analysis and fragility analysis show that the optimum design leads to better performance than the original frame structure. For regular structures, it is demonstrated that the optimum pattern of viscous damper placement obtained from a 2D frame model can be directly used in the retrofitting of the 3D frame model. The economic loss and repair time analyses are conducted for the retrofitted frame structure under different earthquake intensities, including the frequent earthquake, the occasional earthquake, and the rare earthquake. Although the proposed method is based on time-history analyses, it seems that the computational cost is acceptable because the 2D frame model is adopted to determine the optimum pattern of viscous damper placement; meanwhile, the owner can clearly know the economic benefits of the retrofitting under different earthquake intensities. The retrofitting also causes the frame to have reduced environmental problems (such as carbon emission) compared to the original frame in the repair process after a rare earthquake happens. Appl. Sci. 2019, 9, 5486 2 of 23 due to several aspects; e.g., the new observations from recent earthquakes, technical improvements of hazard analysis, data accumulation, and societal and economic increases.One of the issues is that a large number of existing buildings have insufficient resistant capacities to satisfy the increased design earthquake intensity. In terms of economic benefit and environmental sustainability, the best choice is to retrofit existing structures rather than demolish them and rebuild new ones. Among many retrofitting methods [4][5][6][7][8][9][10][11], the placement of viscous dampers may be one of the easy ways to improve the seismic performance of structures, because it only induces limited downtime. To date, many studies have focused on the retrofitting of structures with viscous dampers. Pekcan et al. [12] showed that the setting of the viscous damper coefficient of the story should be according to the story shear, and placements of dampers at upper stories may be not effective. Uriz and Whittaker [13] studied the effectiveness of using viscous dampers for the retrofit of a frame building before the Northridge earthquake. Silvestri and Trombetti [14] presented a parametric analysis to compare the performances offered by various systems of added viscous dampers in shear-type structures. ...

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Section: Sustainability Analysis For the Proposed Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Zhang

2019

Applied Sciences

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“…Metallic foams could be a suitable material for earthquake-resistant building construction [32]. Materials and composites based on metallic foams have also found widespread uptake in this field of human activity in order to provide the low-cost thermal management of buildings [33].…”

Section: Properties and Applications Of Metallic Foamsmentioning

confidence: 99%

Use of Molding Mixtures for the Production of Cast Porous Metals

Kroupová

Gawronová

Lichý

et al. 2022

Metals

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This paper aims to present the possibility of producing cast porous metals (or metallic foams) in a low-tech way by the use of conventional foundry technologies, i.e., the common procedures and materials. Due to the technological and economic complexity of the production processes of cast metallic foams, research into this material currently focuses on the development of less demanding technologies. The introduction of such production processes may help to exploit the full application potential of metallic foams. Within the framework of our proposed procedure, molding and core mixtures are used for the production of molds and filler material (space holder), also called precursors. It is the shape, size, and relative position of the individual precursors that determines the shape of the internal structure of the resulting metallic foam. The core mixture for the production of precursors is evaluated in terms of changes in properties with respect to storage time. Attention is focused on one of the most common bonding systems, furan no-bake. Casting tests are carried out for the possibility of making cast porous metals from aluminum alloy with different shapes of internal cavities depending on the different shapes of the filler material. The collapsibility of the cores after casting is evaluated for the test castings. The results show that even using commonly available materials and processes, cast metallic foams with complex internal structures can be produced.

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“…Metallic foams combine a metallic matrix with controlled porosity. Closed-cell metallic foams exhibit superior mechanical properties and are predominantly considered for structural applications [1]. Open-cell metallic foams combine a highly conductive metallic matrix with a large volumetric surface area.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and Characterization of Tube-Filled ZA27 Metal Foam Heat Exchangers

Fiedler

Moore

Movahedi

2021

Metals

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This study investigates the heat transfer performance of a novel ZA27 metal foam heat exchanger. An open-celled metal foam is combined with a thin-walled copper tube in a single-step casting process. The heat transfer between two separated water streams flowing through the copper tube and foam, respectively, is measured and compared to an equivalent shell tube heat exchanger arrangement. Heat transfer enhancement of up to 71% and a heat transfer rate exceeding 30 kW are observed and attributed to the increased surface area of the metallic foam. However, overall performance was limited by the inefficient heat transfer between the internal mass stream and the copper tube.

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Metal Foam-Filled Tubes as Plastic Dissipaters in Earthquake-Resistant Steel Buildings

Cited by 12 publications

References 18 publications

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Retrofit Existing Frame Structures to Increase Their Economy and Sustainability in High Seismic Hazard Regions

Use of Molding Mixtures for the Production of Cast Porous Metals

Manufacturing and Characterization of Tube-Filled ZA27 Metal Foam Heat Exchangers

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