Acta Polytechnica CTU Proceedings. 2022 ( vol. 32-39): Poslední příspěvky
Zobrazují se záznamy 181-200 z 290
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Analyzing the impact of the aspect ratio of a building on concrete use in its structure
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Buildings consume over half of annual energy supply as embodied and operating energy in their construction and operation releasing harmful emissions to the atmosphere. Over 90 % of the embodied energy is attributed to ... -
Circular concrete: validating new technologies in the lab and on-site
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The growing importance of a circular economy also holds possibilities for concrete. Some of the principles of circularity, like the re-use of "waste" as secondary raw material and the optimisation of the design with regards ... -
On the effects of modified lane configuration due to construction works on bridge loading
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Construction works are frequently recurring events within highway networks, temporarily altering the characteristics of the traffic flow and hence of the bridge loading process. Consequently, highway bridge superstructures ... -
Establishing model uncertainty of SLS reinforced concrete crack models applied to load-induced cracking
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Although some research has been performed, serviceability limit state (SLS) concrete crack models have yet to be calibrated fully in probabilistic terms in structural design standards. This is partly due to the fact that ... -
Semi-probabilistic assessment of existing bridge using simplified methods for estimation of variance
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper is focused on assessment of existing prestressed concrete bridge by simplified methods for estimation of coefficient of variation. The bridge was selected in the framework of the European Project INTERREG ... -
Probabilistic assessment and sensitivity analysis of existing concrete bridge via surrogate modeling
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper is focused on probabilistic assessment and sensitivity analysis of existing prestressed concrete bridge using surrogate model in form of Polynomial Chaos Expansion (PCE). The bridge was selected in the framework ... -
Reliability of existing reinforced concrete slabs exposed to punching shear
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Selected standardised models for the verification of punching shear in reinforced concrete structures are applied for the probabilistic assessment of their reliability level. It appears that the models given in EN 1992-1-1 ... -
Simplified modelling of the performance of concrete tunnels during fire and post-fire damage classification
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The performance of concrete tunnel structures during and after fire is not well understood. This is an obstacle to the adoption of risk-based approaches for fire safety design of tunnel structures. Upon the request of the ... -
Development of conformity criteria for durability and its influence on service life predictions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)To ensure the quality of produced concrete batches, it is often verified whether a specified concrete compressive strength is reached by the application of conformity control. The conformity criteria used for this purpose ... -
Effect of decision parameter efficiency on target reliability
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Target reliability forms the basis of most modern design standards and is intended to represent an optimal balance of safety and risk of failure. Previous research noted discrepancies between target reliability obtained ... -
Adaptive sequential sampling for reliability estimation of binary functions
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A novel method for estimation of rare event probability is proposed, which works also for computational models returning categorical information only: success or failure. It combines the robustness of simulation methods ... -
Environmental impacts of using desalinated water in concrete production in areas affected by freshwater scarcity
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Up to 500 litres of water may be consumed at the batching plant per cubic meter of ready mix concrete, if water for washing mixing trucks and equipment is included. Demand for concrete is growing almost everywhere, regardless ... -
Stainless steel-FRCM system for strengthening of RC beams: towards a sustainable strengthening technique
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Fabric-Reinforced Cementitious Matrix (FRCM) systems for strengthening concrete structures are an alternative to traditional techniques. The FRCM system is a composite material consisting of two or more layers of cement-based ... -
Application of high performance concrete for reconstruction
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)One of the sustainability aspects of the construction is a sufficient durability. In objectively justified cases, the durability is enhanced by reconstruction. To ensure economic design of the reconstruction, non-liner ... -
Effect of TiO2 and ZnO powder mixtures on mechanical and photocatalytic performance of high performance concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The development of new modified cement-based materials is increasingly becoming a necessity for improving the durability and surface performance of building materials. Titanium dioxide (TiO2) photocatalyst has been widely ... -
Conformity assessment model for mechanical coupling devices and anchors for reinforcing steel for use in concrete structure
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The use of mechanical coupling devices and anchors for reinforcing steel for use in concrete structures can simplify the design and construction of reinforced concrete and reduce the amount of reinforcement required. ... -
Comparative flexural performance of steel fibre reinforced self-compacting concrete (SCFRC) ribbed slab with different fibre provision area
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The flexural performance of three SCFRC ribbed slabs with different fibre provision area were investigated in this paper; in both ribs and flange (SFWS), ribs only with additional welded mesh in flange (SFT) and in ribs ... -
3d finite element simulation of reinforced concrete column strengthened by partially confined carbon fibre reinforced polymer under concentric loading
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In this paper, numerical simulation initiated to investigate the mechanical response of reinforced concrete (RC) column strengthened by partially confined carbon fiber reinforced polymer (CFRP). An experimental investigation ... -
Using an analysis of concrete and cement EPD: verification, selection, assessment, benchmarking and target setting
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The carbon embodied in buildings is an important proportion of our emissions and needs to be radically reduced in order to support climate change mitigation. The highest proportion of embodied carbon is usually emitted ... -
ASSESSMENT OF SHEAR STRENGTH PARAMETERS OF SOIL FROM LOAD MICROPILE TESTS
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Design and evaluation of the bearing capacity of micropiles are based on shear strength parameters of the soil within which a micropile is installed. These parameters are mostly received from laboratory tests or as an ...