Showing papers in "Computers & Structures in 2010"

TL;DR: In this paper, a crack tracking procedure is proposed in detail and implemented in the context of the extended element-free Galerkin method (XEFG) for three-dimensional cracking.

TL;DR: The numerical results indicate that for 2D and 3D continuum, locking can be avoided and the principle is extended to partition of unity enrichment to simplify numerical integration of discontinuous approximations in the extended finite element method.

TL;DR: In this article, a practical modeling approach to solve some of the pitfalls of conventional numerical modeling of Rayleigh-type damping in inelastic structures is proposed, by modeling each structural element with an equivalent combination of one elastic element with stiffness-proportional damping, and two springs at its two ends with no stiffness proportional damping.

TL;DR: In this paper, a socio-politically motivated strategy called imperialist competitive algorithm (ICA) is presented to optimize the skeletal structures of a multi-agent algorithm with each agent being a country, which is either a colony or an imperialist.

TL;DR: In this paper, a hierarchical beam element model based on the Carrera Unified Formulation (CUF) is presented, where the displacement components are expanded in terms of the section coordinates, (x,y), using a set of 1-D generalized displacement variables.

TL;DR: In this paper, a family of methods for identification of the parameters of both the Kelvin-Voigt fractional model and the Maxwell fractional models are presented in order to describe the behavior of viscoelastic dampers using a small number of parameters.

TL;DR: In this article, a modified SIMP model is developed to effectively avoid the artificial modes, and a new bi-directional evolutionary structural optimization (BESO) method combining with rigorous optimality criteria is developed for topology frequency optimization problems.

TL;DR: A quasi-Newton coupling algorithm with an approximation for the inverse of the Jacobian (IQN-ILS) has been developed and compared with a monolithic solver in previous work as discussed by the authors.

TL;DR: Optimum design of B-pillar is proposed by using tailor-welded blank (TWB) structure to minimize the weight under the constraints of vehicle roof crush and side impact, in which support vector regression (SVR) is used for metamodeling.

TL;DR: In this article, a novel method to solve affine systems of linear equations is presented, which allows for the application of affine arithmetic in finite element analysis and is illustrated with three applications.

TL;DR: In this article, two statistical methods based on moving principal component analysis and robust regression analysis are demonstrated to be useful for damage detection during continuous static monitoring of civil structures during SHM.

TL;DR: In this article, the Reissner's mixed variational theorem (RMVT) is extended to functionally graded material (FGM) plates subjected to a transverse mechanical load, and the results are compared with 3D solutions and with PVD models.

TL;DR: In this paper, a numerical method is presented for form-finding of tensegrity structures, where the topology and the types of members are the only information that requires in this form finding process.

TL;DR: Genetic algorithms, simulated annealing, evolution strategies, particle swarm optimizer, tabu search, ant colony optimization and harmony search are utilized to develop seven optimum design algorithms for real size rigidly connected steel frames.

TL;DR: In this paper, a new procedure for the ductility demands control of single-degree-of-freedom systems under repeated near-fault earthquakes is proposed using appropriate behavior factors.

TL;DR: In this article, a family of explicit methods for linear elastic systems is proposed and the most important aspects of this subfamily are the possibility of unconditional stability for nonlinear systems and second-order accuracy.

TL;DR: Two variants of the particle swarm optimization (PSO) algorithm are employed for the identification of Bouc-Wen hysteretic systems, one of which is simple while the other is enhanced, as it implements additional operators.

TL;DR: In this paper, the ground motion is modeled by the superposition of two contributions: the first one is a fully nonstationary counterpart modeled by a recorded earthquake; the second one was a corrective random process adjusting the recorded earthquake in order to make it spectrum compatible.

TL;DR: In this paper, a unified optimization algorithm for multifunctional 3D finite periodic structures is presented, in which the topological sensitivities at the corresponding locations of different components are regulated to maintain the structural periodicity.

TL;DR: In this article, a method based on the power series solution is proposed to solve the natural frequency of very slender rotating beam at high angular velocity, where the rotating beam is subdivided into several equal segments.

TL;DR: In this article, damage detection procedures based on measured natural frequencies and building structure mode shapes are discussed, where modal curvature and structural flexibility approaches are tested and attention is paid to the modal identification errors that influence damage detection.

TL;DR: In this paper, the authors developed microstructural numerical models of closed cell foam made of aluminium alloy by means of a finite elements code, the material cellular structure was shaped in different ways: firstly the Kelvin cell, with both plane and curved walls; finally an ellipsoidal cell defined by random dimensions, position and orientation has been adopted as base unit.

TL;DR: In this paper, a new method is presented for the finite element model updating of structures at the element level utilizing Frequency Response Function data, which can be an alternative to conventional model updating methods even in the presence of mass modeling errors.

TL;DR: In this paper, a numerical method is presented for initial self-stress design of tense-grity grid structures, which is defined as the linear combination of the coefficients of independent self-stress modes.

TL;DR: In this article, the wave finite element (WFE) method is investigated for computing the low and mid-frequency forced response of straight elastic structures, which are numerically calculated using the finite element model of a typical substructure with a small number of degrees of freedom, and invoking Bloch's theorem.

TL;DR: An empirical assessment of three approaches to nonlinear regression modelling with feed-forward neural networks involving the use of evidence framework and full Bayesian inference with Markov chain Monte Carlo stochastic sampling shows that Bayesian approach with the MCMC sampling approximation of learning and prediction gives the best prediction accuracy.

TL;DR: In this article, the authors evaluate the sensitivity of aeroelastic damping to a number of uncertain structural, geometrical and structural-damping parameters and find that structural damping results in a small but significant increase in the flutter speed.

TL;DR: A partitioned time marching algorithm is employed for the solution of the time-dependent coupled discretised problem, enabling the use of highly developed, robust and well-tested solvers for each field.

TL;DR: In this paper, the authors presented two numerical procedures to determine upper and lower bounds on the actual collapse load multiplier for plates in bending by using the conforming Hsieh-Clough-Tocher (HCT) and enhanced Morley (EM) elements.

TL;DR: In this article, a 3D finite element procedure is proposed to model ground movements in urban environments, in which the structural behavior of the building is represented by a mesh of elastic Timoshenko beams generated on the building footprint.