Showing papers by "Antonio Rodríguez-Ferran published in 2006"

Experimental testing of joints for seismic design of lightweight structures. Part 1. Screwed joints in straps

Abstract: An experimental testing campaign on tensile bolted joints between straps is reported. Two dominant failure modes are identified: (1) tilting, bearing and tearing of the sheets (TS) and (2) tilting, bearing and net-section failure (NSF). The analysis in terms of ductility and strength shows that bolted connections are less adequate than screwed connections (reported in Part 1 of this paper) for the seismic design of X-braced shear walls in lightweight structures. NSF joints are more ductile than TS joints in the sense that they undergo larger displacements before failure. However, if washers are not used, both types of connections fail before energy dissipation through yielding of the diagonal straps can occur. Some design recommendations to improve the seismic performance of bolted joints, including the use of washers, are given. The accuracy of Eurocode 3 formulas to predict the ultimate load is also analyzed.

Novel nonlocal continuum formulations. Part 1: gradient elasticity based on nonlocal displacements and nonlocal strains

Abstract: Nonlocal continuum formulations exist in integral formats and differential formats. The latter, also known as gradient-enriched continua, have successfully been applied in elasticity, plasticity and damage and provide a robust framework to analyse size effects and dispersive waves. Moreover, gradient enhancement can be used to remove singularities from elastic fields as well as guarantee well-posedness in the modelling of post-peak phenomena. In this paper, the focus will be on novel formulations for gradient elasticity.