CFD modelling of the braced barrel vault made from rectangular hollow sections in natural fire

In the paper the CFD modelling of the complicated braced barrel vault made from rectangular hollow sections in natural fire is presented. The barrel vault is covering a shopping arcade.  The covered area of this shopping arcade is 40m x 80m. The shopping arcade has two levels. One of the levels is underground. The model is built in full 3D. Natural fire is simulated in FDS software for different fire scenarios. Fire load densities, fire growth rate and rate of heat release are determined from EN 1-1-2: General Actions - Actions on structures exposed to fire. Heat release rate per area is determined for t² function. The analysis shows temperature of rectangular hollow sections, distribution of temperature in the shopping arcade, visibility and heat fluxes. The temperatures or heat fluxes can be transferred to the non-linear structural analysis in finite element code Abaqus

Metal-rich organic matter and hot continental passive margin: drivers for Devonian copper-cobalt-germanium mineralization in dolomitized reef-bearing carbonate platform

The abundance and types of reef-bearing carbonate platforms reflect the evolution of Devonian climate, with conspicuous microbial-algal reefs in the warm Early and Late Devonian and sponge-coral reefs in the cooler Middle Devonian. A dolomitized Wenlock-Lower Devonian microbial-algal reef-bearing carbonate platform hosts epigenetic copper-cobalt-germanium (Cu-Co-Ge) sulfide mineralization at Ruby Creek-Bornite in the Brooks Range, Alaska. Here, we present rhenium-osmium (Re-Os) radiometric ages and molybdenum and sulfur (δ(98/95)Mo = +2.04 to +5.48‰ and δ(34)S = −28.5 to −1.8‰) isotope variations for individual Cu-Co-Fe sulfide phases along the paragenetic sequence carrollite-bornite-pyrite. In the context of a hot, extensional passive margin, greenhouse conditions in the Early Devonian favored restriction of platform-top seawater circulation and episodic reflux of oxidized brines during growth of the carbonaceous carbonate platform. Molybdenum and sulfur isotope data signal the stepwise reduction of hot brines carrying Cu during latent reflux and geothermal circulation for at least ca. 15 million years from the Early Devonian until Cu-Co sulfide mineralization ca. 379–378 million years ago (Ma) in the Frasnian, Late Devonian (weighted mean of Re-Os model ages of carrollite at 379 ± 15 Ma [n = 4]; Re-Os isochron age of bornite at 378 ± 15 Ma [n = 6]). On the basis of petrographic relationships between sulfides and solid bitumen, and the Mo and S isotope data for sulfides, we imply that the endowment in critical metals (e.g., Co, Ge, Re) in the Ruby Creek-Bornite deposit is linked to the activity of primary producers that removed trace metals from the warm Early Devonian seawater and concentrated Co, Ge, and Re in algal-bacterial organic matter in carbonate sediments. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s00126-022-01123-1

Modern Trends in Research on Steel, Aluminium and Composite Structures

Modern Trends in Research on Steel, Aluminium and Composite Structures includes papers presented at the 14th International Conference on Metal Structures 2021 (ICMS 2021, Poznań, Poland, 16-18 June 2021). The 14th ICMS summarised a few years’ theoretical, numerical and experimental research on steel, aluminium and composite structures, and presented new concepts. This book contains six plenary lectures and all the individual papers presented during the Conference. Seven plenary lectures were presented at the Conference, including "Research developments on glass structures under extreme loads", Parhp3D – The parallel MPI/openMPI implementation of the 3D hp-adaptive FE code", "Design of beam-to-column steel-concrete composite joints: from Eurocodes and beyond", "Stainless steel structures – research, codification and practice", "Testing, modelling and design of bolted joints – effect of size, structural properties, integrity and robustness", "Design of hybrid beam-to-column joints between RHS tubular columns anИспользуемые программы Adobe AcrobatСовременные тенденции в исследованиях стальных, алюминиевых и композитных конструкций включают доклады, представленные на 14-й Международной конференции по металлическим конструкциям 2021 (ICMS 2021, Познань, Польша, 16-18 июня 2021 года). На 14-м ICMS были подведены итоги теоретических, численных и экспериментальных исследований стальных, алюминиевых и композитных конструкций за несколько лет и представлены новые концепции. Эта книга содержит шесть пленарных лекций и все отдельные доклады, представленные в ходе конференции. На конференции было представлено семь пленарных лекций, в том числе "Исследовательские разработки в области стеклянных конструкций при экстремальных нагрузках", Parhp3D – Параллельная реализация MPI/OpenMPI 3D-кода hp-adaptive FE", "Проектирование соединений сталебетонных композитов от балки к колонне: от еврокодов и далее", "Конструкции из нержавеющей стали – исследования, кодификация и практика", "Тестирование, моделирование и проектирование болтовых соединений – влияние размера, конст

Metal-rich organic matter and hot continental passive margin: drivers for Devonian copper-cobalt-germanium mineralization in dolomitized reef-bearing carbonate platform

The abundance and types of reef-bearing carbonate platforms reflect the evolution of Devonian climate, with conspicuous microbial-algal reefs in the warm Early and Late Devonian and sponge-coral reefs in the cooler Middle Devonian. A dolomitized Wenlock-Lower Devonian microbial-algal reef-bearing carbonate platform hosts epigenetic copper-cobalt-germanium (Cu-Co-Ge) sulfide mineralization at Ruby Creek-Bornite in the Brooks Range, Alaska. Here, we present rhenium-osmium (Re-Os) radiometric ages and molybdenum and sulfur (delta Mo-98/95 = +2.04 to +5.48 parts per thousand and delta S-34 = -28.5 to -1.8 parts per thousand) isotope variations for individual Cu-Co-Fe sulfide phases along the paragenetic sequence carrollite-bornite-pyrite. In the context of a hot, extensional passive margin, greenhouse conditions in the Early Devonian favored restriction of platform-top seawater circulation and episodic reflux of oxidized brines during growth of the carbonaceous carbonate platform. Molybdenum and sulfur isotope data signal the stepwise reduction of hot brines carrying Cu during latent reflux and geothermal circulation for at least ca. 15 million years from the Early Devonian until Cu-Co sulfide mineralization ca. 379-378 million years ago (Ma) in the Frasnian, Late Devonian (weighted mean of Re-Os model ages of carrollite at 379 +/- 15 Ma [n = 4]; Re-Os isochron age of bornite at 378 +/- 15 Ma [n = 6]). On the basis of petrographic relationships between sulfides and solid bitumen, and the Mo and S isotope data for sulfides, we imply that the endowment in critical metals (e.g., Co, Ge, Re) in the Ruby Creek-Bornite deposit is linked to the activity of primary producers that removed trace metals from the warm Early Devonian seawater and concentrated Co, Ge, and Re in algal-bacterial organic matter in carbonate sediments.ISSN:0026-4598ISSN:1432-186