Comparative study of analytical formulae for the fire resistance of steel beam-columns

peer reviewedThis paper investigates the difference between the buckling formulae published in the Eurocode 3 part 1.2 and the recommendations made in the final report of the Buckling Curves in Case of Fire (BCCF) research project. This study compares the critical temperatures obtained with both formulations to assess the impact on the fire endurance of steel columns subjected to axial compression and bending. An extensive comparison of the ultimate temperatures obtained with both formulations has been performed (382 profiles, buckling about the strong and weak axis, 12 column lengths, 6 M/N ratios and uniform and triangular bending moment distributions). Failure temperatures between 400°C and 860°C have been considered. The formulations are also compared with Finite Elements (F.E.) calculations performed for a S235 HEA 200 at 600ºC. This analysis shows that for buckling about the strong axis the BCCF method is better than the EC3 but for buckling about the weak axis the EC3 predicts failure temperatures closer to the F.E. model than the BCCF formulation. Finally, the ultimate temperatures predicted by the two formulations have also been compared with experimental results from the database SCOFIDAT. This comparison shows that there is no major difference between the two formulations for small and large bending moments. This study concludes that the EC3 and BCCF formulations are generally equivalent and that either formulation can be used

Addition to "Nanostars carrying multifunctional neurotrophic dendrimers protect neurons in preclinical in vitro models of neurodegenerative disorders".

In the original version of this article (p. 47457), some acknowledgments were not included. In the revised Acknowledgments section provided below, we additionally provide The REC reference for the ethical approval of the human astrocyte isolation, an acknowledgment to Dr. Alize Proust at the Francis Crick Institute for establishing the triple coculture BBB model used in this study, and the reference and the grant number for the source of the human fetal material. This does not affect the results or conclusions of our work

A damage constitutive law for steel elevated temperature. Identification of the parameters

peer reviewedThis paper presents a methodology of damage analysis at elevated temperature using the finite element method. Both the model and the methodology to identify parameters are summarized. The mechanical properties are established using compression tests at elevated temperature. An elasto-visco-plastic model depending on temperature is identified. A metallographic analysis is used to determine the original size and morphology of the austenitic grains. The experimental damage analyses consist in acoustic tests in order to determine the apparition of the first crack during compression. Finite element simulations of these experiments allow the determination of the damage parameters using a reverse method

Numerical investigation of the buckling of steel columns in pure compression under fire conditions

This paper aims to numerically investigate the response of steel columns in compression when exposed to elevated temperature. Numerical simulations using finite element computer program SAFIR have been carried out to study the behavior of axially loaded steel columns under uniform increasing temperature. Based on the numerical results it has been found that there is a direct correlation between the failure load at 400°C and the coefficient K_y,0 which can be used to calculated failure temperatures above 400°C. Two formulations for the buckling coefficient are proposed based on the hypothesis of an exponential shape function at 400°C. Good agreement is found between the analytical formulations and the F.E. results. Another formulation based on a logarithmic shape function is also studied and it is shown that it is in excellent agreement with the results from the F.E.A. Finally a new formula to calculate the failure load/ultimate temperature of axially loaded columns is presented

Local buckling of structures in case of fire

peer reviewe

Validation of a shell finite element for concrete and steel structures subjected to fire

peer reviewe