@inproceedings{SykoraBotteCaspeeleetal., author = {S{\´y}kora, Miroslav and Botte, Wouter and Caspeele, Robby and Diamantidis, Dimitris and Muttoni, Aurelio and Steenbergen, Rapha{\"e}l D.J.M.}, title = {Probabilistic models for resistance variables in fib Model Code 2020 for design and assessment}, series = {Acta Polytechnica CTU Proceedings}, volume = {36}, booktitle = {Acta Polytechnica CTU Proceedings}, publisher = {Czech Technical University in Prague}, doi = {10.14311/APP.2022.36.0206}, pages = {206 -- 215}, abstract = {The fib Model Code offers pre-normative guidance based on the synthesis of international research, industry and engineering expertise. Its new edition (draft MC 2020) will bring together coherent knowledge and experience for both the design of new concrete structures and the assessment of existing concrete structures. This contribution presents an overview of the main developments related to the partial factors for materials. In the draft MC2020, the partial factors are presented in tables for clusters of cases depending on consequence classes and variability of basic variables. Furthermore, formulas and background information are provided to facilitate updating of the partial factors. This contribution discusses the different assumptions adopted in MC 2020 for design and assessment. Main changes with respect to the previous version are related to description of the difference between in-situ concrete strength and the material strength measured on control specimens, and to modelling of geometrical variables. The presented comparison of the requirements imposed by Eurocodes and MC 2020 for design reveals insignificant differences. The assessment requirements may be decreased by about 25\% when the conditions specified in MC 2020 are satisfied. Hence, the revised MC 2020 will provide designers and code makers with wider possibilities to utilise actual data and long-term experience in assessments of existing structures.}, language = {en} } @article{OrcesiDiamantidisO’Connoretal., author = {Orcesi, Andr{\´e} and Diamantidis, Dimitris and O'Connor, Alan and Palmisano, Fabrizio and S{\´y}kora, Miroslav and Boros, Vazul and Caspeele, Robby and Chateauneuf, Alaa and Mandić Ivanković, Ana and Lenner, Roman and Kušter Marić, Marija and Nadolski, Vitali and Schmidt, Franziska and Skokandić, Dominik and van der Spuy, Pierre}, title = {Investigating Partial Factors for the Assessment of Existing Reinforced Concrete Bridges}, series = {Structural Engineering International}, journal = {Structural Engineering International}, publisher = {Taylor \& Francis}, doi = {10.1080/10168664.2023.2204115}, pages = {1 -- 16}, abstract = {There is great interest in developing an adequate partial factor format for the assessment of existing structures, and in particular bridges, that should be able to take various aspects into account linked to the fact that the structure already exists. As the structure is existing, additional information related to material parameters, loading conditions, local structural defects, etc. can be accounted for. In addition, the degree of conservatism needs to be well balanced to avoid unnecessary investment of resources in replacement or retrofitting. This contribution considers the experience gained in recent years in parallel with some ongoing standardisation work in relation to Eurocodes and the next edition of the fib Model Code for new and existing concrete structures. The current state of the art of partial factors for the assessment of existing structures is explored and the differences are assessed based on a comparison between (i) the use of recommended fixed partial factors as provided in many national and international codes, (ii) adjusted (flexible) partial factors derived for the individual case under consideration, and (ii) reliability-based verification. In order to assess the adequacy of proposals and identify some differences, the available partial factor formats are applied to two case studies of reinforced concrete bridges and they are critically assessed.}, language = {en} }