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The structural performance of arches made of few vossoirs with dry-joints
Ernest Bernat-Maso,Lluís Gil,Jordi Marcé-Nogué 국제구조공학회 2012 Structural Engineering and Mechanics, An Int'l Jou Vol.44 No.6
This work approaches the structural performance of masonry arches that have a small ratio between number of vossoirs and span length. The aim of this research is to compare and validate three different methods of analysis (funicular limit analysis F.L.A., kinematic limit analysis K.L.A. and plane stress Finite Element Analysis F.E.A.) with an experimental campaign. 18 failure tests with arches of different shapes and boundary conditions have been performed. The basic failure mechanism was the formation of enough hinges in the geometry. Nevertheless, in few cases, sliding between vossoirs also played a relevant influence. Moreover, few arches didn’t reach the collapse. The FLA and KLA didn't find a solution close to the experimental values for some of the tests. The low number of vossoirs and joints become a drawback for an agreement between kinematic mechanism, equilibrium of forces and geometry constraints. FLA finds a lower bound whereas KLA finds an upper bound of the ultimate load of the arch. FEA is the most reliable and robust method and it can reproduce most of the mechanism and ultimate loads. However, special care is required in the definition of boundary conditions for FEA analysis. Scientific justification of the more suitability of numerical methods in front of classic methods at calculating arches with a few vossoirs is the main original contribution of the paper.
A finite element-experimental study of the impact of spheres on aluminium thin plates
Giancarlo B. Micheli,Larissa Driemeier,Marcílio Alves 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.55 No.2
This paper describes a study of the collision of hard steel spheres against aluminium thin circular plates at speeds up to 140 m/s. The tests were monitored by a high speed camera and a chronoscope, which allowed the determination of the ballistic limit and the plate deformation pattern. Quasi-static material parameters were obtained from tests on a universal testing machine and dynamic mechanical characterization of two aluminium alloys were conducted in a split Hopkinson pressure bar. Using a damage model, the perforation of the plates was simulated by finite element analysis. Axisymmetric, shell and solid elements were employed with various parameters of the numerical analysis being thoroughly discussed, in special, the dynamic model parameters. A good agreement between experiments and the numerical analysis was obtained.
Negative neuromuscular and functional repercussion of forced swimming after axonotmesis
Júlia Araújo de Moura,Jaqueline de Morais,Samara Maria Neves Barbosa,Marcílio Coelho Ferreira,Ivo Vieira de Sousa Neto,Hércules Ribeiro Leite,Murilo Xavier Oliveira,Thaís Peixoto Gaiad,Ana Paula Santo 한국운동재활학회 2022 JER Vol.18 No.3