Acta Polytechnica CTU Proceedings. 2022 ( vol. 32-39): Poslední příspěvky
Zobrazují se záznamy 141-160 z 290
-
A study on properties of concrete with dry fly ash and fly ash slurry stored with stirring
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In the evaluation of concrete sustainability, what constitutes "sustainable" to one region may vary from another. This often leads to methodological forms of uncertainties that makes the evaluation process more complex. ... -
Study for re-ASR behaviour of recycled concrete using ASR generated concrete and considering countermeasure technology
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)It is predicted that the concrete volume to be discarded will increase due to the renewal of the concrete structures and the increase in the returned concrete from construction site. The use of this concrete block as ... -
Lower bound analysis for shear assessment of full-scale RC girders subjected to axial tension
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Axial tension force exerted as a result of a temperature change or shrinkage can cause the collapse of RC structural members. Design code provisions and analytical models such as Modified Compression Field Theory (MCFT) ... -
Durability evaluation of surface softened steel bar for prestressed concrete
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effects of Si addition and surface softening on delayed fracture susceptibility were evaluated in tempered martensitic steels with tensile strength of 1450 MPa. The delayed fracture susceptibility was reduced when Si ... -
Expansion of sustainability in the ACI 318 building code
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The American Concrete Institute (ACI) has long recognized the growing importance of accounting for environmental sustainability in the design of concrete structures. As the next version of the ACI 318 Building Code is being ... -
Suggestion of ultimate strength formulas of partial frame pile cap composed of exterior column, foundation beam and pile
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Currently, there is no research and few valid experiments of pile caps. And shear failure mechanism of a pile, exterior column and foundation beam and pile caps in RC structure is not resolved yet under bi-lateral loading. ... -
Chloride ion penetration behaviour in concrete containing an expansive additive and a calcium-aluminate-based additive
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The effect of the material characteristics on the infiltration behaviour of chloride ions in concrete containing a combination of an expansive additive and a calcium-aluminate-based additive has been investigated. The same ... -
Degradation of Cr-coated cladding under the simulated Loss-of-Coolant Accident phenomena
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The present study focuses on the evaluation of the mechanical properties degradation of Cr-coated Zr-alloy fuel cladding. The main objective of the work is to find a suitable methodology to evaluate the mechanical properties ... -
Risk based maintenance for Swiss railway bridges: concept, implementation and first experiences
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The Swiss Federal Railway (SBB) has an inventory of approx. 6,000 bridges. So far, condition classes of the individual bridges have been used for maintenance management. To improve the efficiency of the maintenance management, ... -
The characterization of the collimated beams of fast neutrons with the clid detection system
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A new detection device for the measurements of light ions (p, d, t, α) emitted as the products of the nuclear reactions induced by fast neutrons (5-33 MeV) was recently developed at the Nuclear Physics Institute of the ... -
New or existing, does it matter?
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Both when designing new and when evaluating existing structures, methods of analysis must be based on established engineering theory and practice. Also, the general principles of structural reliability regarding the treatment ... -
Statistical characterisation of reinforcement properties for textile-reinforced concrete: a novel approach
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The potential of textile-reinforced concrete is broad: it can be used in new structures and in the retrofitting of existing structural components. Designing textile-reinforced concrete requires knowledge about the mechanical ... -
Comparison of the collapse frequency and failure probability of buildings
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In a previous study, the collapse frequencies and associated mortalities of buildings were compiled based on various publications. The investigation showed a considerable scattering of collapse frequencies depending on the ... -
Modelling of fission gas release in UO2 doped fuel using transuranus code
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The expected benefits from Cr-doped fuel are improved retention of fission gases within the pellets due to its large grain size. To demonstrate this, several experiments have been carried out by Halden reactor and Studsvik. ... -
Assessment of existing structures under climate change
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Assessment of the influence of human activities on recent, current, and future global and regional climate conditions and extremes has advanced sufficiently to provide a reasonable measure of its impact across the globe. ... -
Structural assessment and expected utility gain
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)This paper contains an introduction, probabilistic formulation, and exemplification (1) of system state and utility actions, (2) system state and utility action value analysis and (3) a threshold formulation for a predicted ... -
Technical effectiveness of cement-based mortar for high-reflective building envelope through building energy simulations: preliminary results
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In areas with high levels of solar radiation, decreasing the amount of solar energy absorbed by the building envelope is useful to reduce the need of air conditioning and "heat island" effects. Most high-reflective products, ... -
Fire spalling sensitivity of concrete made with recycled concrete aggregates (RCA)
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The fire spalling of concrete is a complex phenomenon, which can affect the integrity of the structures during a fire. This thermal instability is associated with a complex coupled chemo-thermo-hydro-mechanical mechanism ... -
A new performance test to evaluate the sulfate resistance of concrete by tensile strength measurements
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Concrete structures without sufficient durability can be damaged by sulfates in groundwater and from surrounding rock layers. To evaluate the performance of a concrete mixture, precise and performance-oriented test methods ... -
Equivalent thermal diffusivity of natural and recycled aggregate concrete at temperature up to 350 ⁰C
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The paper presents the evolution of equivalent thermal diffusivity with temperature of concretes with natural coarse aggregates and recycled concrete aggregates. Thermal diffusivity was evaluated based on the temperature ...