Acta Polytechnica CTU Proceedings. 2022, vol. 36
Zobrazují se záznamy 1-20 z 34
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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, ... -
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 ... -
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 ... -
Uncertainty assessment for the Bayesian updating process of concrete strength properties
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Reassessment of infrastructure buildings has become an essential approach to deal with increasing traffic loads on ageing infrastructure buildings and to verify the service-life of those structures. Good estimation of the ... -
Practical concepts for the use of probabilistic methods in the structural analysis and reassessment of existing bridges - presentation of latest research and implementation
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)In structural engineering and bridge construction, probabilistic calculations are only performed in a few exceptional cases. The ability to directly use information from the existing structure is an important advantage of ... -
Maximizing information obtained from standardized fire tests using a Bayesian framework
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Current practice is mostly focused on prescriptive design approaches where the performance of the structure in case of fire is assessed based on its performance in standardized fire tests. Those tests indicate whether the ... -
On the treatment of measurement uncertainty in stochastic modeling of basic variables
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The acquisition and appropriate processing of relevant information about the considered system remains a major challenge in assessment of existing structures. Both the values and the validity of computed results such as ... -
Artificial intelligence - finite element method - hybrids for efficient nonlinear analysis of concrete structures
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Realistic structural analyses and optimisations using the non-linear finite element method are possible today yet suffer from being very time-consuming, particularly in case of reinforced concrete plates and shells. Hence ... -
Influence of the structural integrity management on the levelized cost of energy of offshore wind: a parametric sensitivity analysis
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)The levelized cost of energy (LCoE) is an important measure to quantify the macro-economic efficiency of an offshore wind farm and to enable a quantitative comparison with other types of energy production. The costs of the ... -
Cost-optimization based target reliability for fire design of insulated steel columns
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)Adequacy of a structural fire design can in theory be demonstrated through a probabilistic risk assessment (PRA) where the compliance with tolerability limits and the ALARP requirement are explicitly ascertained. However, ... -
Reliability of a structure stricken by a tornado
(České vysoké učení technické v PrazeCzech Technical University in Prague, 2022)A tornado may become a very dangerous climatic action for any structure, depending on the tornado intensity and extent of the structure. The origin of a tornado, its range and further activity appear to be unpredictable ... -
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 ...
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