In reliability and robustness analysis, imperfections of a mechanical or structural system, such as material properties or geometrical deviations, are modelled as random fields in order to account for their fluctuations over space. A random field normally comprises a huge number of random variables. The present paper proposes a method to reduce the random variables set. This reduction is perfor...

The structural assessment of doubly-curved vaulted masonry structures, such as pavilion vaults, poses challenges specific to their high degree indeterminacy. Two-dimensional equilibrium analysis methods may provide a lower bound load or displacement capacity, but they do not accurately describe the three-dimensional (3D) behaviour these particularly when shear deformation (e.g. sliding) is impo...

A simple model of circular polarization dependence on Mn delta-layer position in LED heterostructures with InGaAs/GaAs quantum well is proposed, being able to explain quite accurately recent fascinating experimental results [S.V. Zaitsev, et al., Physica E (2009), doi:10.1016/j.physe.2008.11.003]. The model emphasizes the role of position-dependent exchange interaction between injected holes an...

This paper presents a two-degree-of-freedom analytical model for the electromechanical response of double ended tuning fork (DETF) force sensors. The model describes the mechanical interaction between the tines and allows investigation of the effect of a number of asymmetries, in tine stiffness, mass, electromechanical parameters and load sharing between the tines. These asymmetries are introdu...

Abstract Geometrical symmetry plays a significant role in implementing robust, symmetry-protected, bound states the continuum (BICs). However, this benefit is only theoretical many cases since fabricated samples’ unavoidable imperfections may easily break stringent geometrical requirements. Here we propose an approach by introducing concept of geometrical-symmetry-free but symmetry-protected BI...

the existence of some geometrically imperfect members, like initial curvature in a double layer space structures with hundreds or thousands of members is almost inevitable. these imperfections give rise to loss of load bearing capacity of double layer space structures. to evaluate the effect of initial member imperfection on load bearing capacity of double layer space structures and their failu...

The complex global analysis of the steel tied-arch bridges may require specific data in some cases, e.g., residual stress or real geometrical imperfections. presented research is focused on investigation actual in-plane shape bridges. To obtain shapes arches existing bridges, 3D terrestrial laser scanning was applied. Data were then investigated as a group order to find relationship within brid...

Abstract For the stability assessment of members and structures according to EN 1993‐1‐1 equivalent member method, geometrical nonlinear calculation with imperfections or GMNIA analysis residual stresses can be used alternatively. The second possibility requires a corresponding model for cross‐section resistance. verification lateral torsional buckling, bow e0 out plane are defined, which lead ...