Showing papers in "Computers & Structures in 2001"

TL;DR: Practical guidelines for designing ANN for engineering applications, including major aspects of three types of NN, multi-layer perceptron (MLP), radial basis network (RBF) and normalised RBF are discussed and a practical example of a reinforced concrete slab design is presented.

TL;DR: In this article, the problem of structural damage detection is formulated as an optimization problem, which is then solved by using genetic algorithm (GA), which is able to detect the approximate location of the damage, even when practical considerations limit the number of on-site measurements to only a few.

TL;DR: The objective of this paper is to review the general inf–sup condition for mixed finite element methods and summarize numerical procedures for the evaluation of the inf–Sup expressions specific to various problem areas.

TL;DR: In this paper, a mathematical programming algorithm is proposed to obtain an optimum value insensitive to variations on design variables within a feasible region, where a multiobjective function is defined to have the mean and standard deviation of the original objective function, while the constraints are supplemented by adding a penalty term to the original constraints.

TL;DR: Several generalized elitist procedures for the design of composite laminates are explored and it is shown that GES procedures are superior to an SI procedure for two types of problems.

TL;DR: In this article, a modified Hopfield network was used to estimate the bending analysis of an elastic angular plate with unilateral constraints, and its application to estimation of concrete fatigue durability was shown.

TL;DR: Some of the most recent developments of computational stochastic structural mechanics and analysis are reviewed and allow a rational treatment of statistical uncertainties involved in structural analysis and design.

TL;DR: In this article, a new numerical method for the exact solution of nonlinear eigenvalue problems is developed, which associates homotopy and asymptotic numerical techniques and it is applied to determine the natural frequencies and the loss factors of viscoelastically damped sandwich structures.

TL;DR: In this article, three-dimensional nonlinear finite element models of three masonry arch bridges are generated using a commercially available finite element package, where the fill is modelled as a Drucker-Prager material, and the interface between the masonry and fill is characterised as a frictional contact surface.

TL;DR: In this paper, the basis of the finite point method (FPM) for the fully meshless solution of elasticity problems in structural mechanics is described and a stabilization technique based on a finite calculus procedure is used to improve the quality of the numerical solution.

TL;DR: In this paper, a new algorithm for flexible body contact problems that results in a symmetric coefficient matrix and satisfies both the stability and the contact patch conditions is presented, and the stability is related to the form of the assumed contact pressure distribution.

TL;DR: In this paper, a nonlinear finite element analysis was applied to various types of reinforced concrete structures using a new set of constitutive models established in the fixed-angle softened-truss model (FA-STM).

TL;DR: In this article, the service life of reinforced concrete (RC) structures was calculated using a numerical formulation of the associated mass transport partial differential equations, and the stage of active corrosion was modeled by including in the numerical algorithm of the FE formulation the mass conservation equation that describes diffusion of oxygen in the concrete cover.

TL;DR: In this article, the static displacement bounds of structures modelled using uncertain (but non-random) parameters are considered, where the uncertain parameters are assumed to take deterministic values within a specified interval and the bounds of the displacement are obtained by solving interval linear equations.

TL;DR: A plane-stress continuum damage mechanics (CDM) based model for composite materials is implemented in the non-linear finite element code, LS-DYNA3D and its predictive capability is evaluated by carrying out a series of numerical simulations involving impact of laminated composite plates as mentioned in this paper.

TL;DR: In this article, three different lines of computational form finding methods, namely, simulation of hanging models, numerical simulation of soap films, and structural shape optimization, are compared and compared for the special task of maximizing stiffness.

TL;DR: In this paper, a theoretical and experimental dynamic behavior of different multi-beams systems containing a transverse crack is presented, where the additional flexibility that the crack generates in its vicinity is evaluated using the strain energy density function given by the linear fracture mechanic theory.

TL;DR: This paper reports several new numerical integration rules that result in a significant reduction in computational cost in the method of finite spheres.

TL;DR: In this paper, a truncated basis of interface modes in place of the constraint modes, which are introduced in the free and hybrid interface methods, is proposed to reduce the number of interface coordinates in the component mode synthesis methods.

TL;DR: In this study, a new penalty scheme that is free from the aforementioned disadvantages is developed and will be able to adjust itself during the evolution in such a way that the desired degree of penalty is always obtained.

TL;DR: In this article, a formulation and solution technique using genetic algorithms (GA) for design optimization of composite leaf springs is presented, where the optimum dimensions of a composite leaf spring have been obtained, which contributes towards achieving the minimum weight with adequate strength and stiffness.

TL;DR: In this paper, a genetic algorithm based optimum design method is presented for nonlinear multistorey steel frames with semi-rigid connections, which obtains a frame with the least weight by selecting appropriate sections from a standard set of steel sections such as wide flange sections of AISC or universal sections of British standard.

TL;DR: An analytical method based on modal analysis in finite element analysis is proposed for the transformation of dynamic loads into equivalent static load sets, which has the same effect as dynamic optimization which uses the dynamic loads directly.

TL;DR: In this article, a simulated annealing (SA) algorithm is applied to the minimum cost design of reinforced concrete retaining structures to solve a constrained optimisation problem, and a modified SA algorithm is proposed that avoids the simple rejection of infeasible solutions and improves convergence to a minimum cost.

TL;DR: Efficient neural networks are trained for design of double layer grids using a special method for data ordering to reduce the nonlinearity of the data and to increase the speed of training.

TL;DR: In this paper, the stiffness optimization problem for structures with geometrical nonlinearities is investigated and the mean compliance of the structure is chosen as the objective function and its sensitivities are derived using the adjoint method.

TL;DR: In this paper, a linearized dynamic model for multi-link planar flexible manipulators is presented, where the elastic deformation of each link is modeled by using the assumed-mode method.

TL;DR: In this paper, the authors proposed the Solid-shell formulation, which is based on displacement degrees of freedom belonging to the upper and lower shell surfaces, and showed that it is a simple combination with solid elements and no problems concerning large rigid body motions appear.

TL;DR: In this paper, a new technique for computing the lower bound limit loads in unreinforced masonry shear walls under conditions of plane strain is described. But the results of this method are limited to the case of a single unit and do not consider the case where the body is assumed to undergo only small deformation at the limit load and the geometric description of the body at collapse remains unchanged.

TL;DR: In this article, a system model for analyzing the dynamic behavior of an internal combustion engine crankshaft is described, which couples the crankshaft structural dynamics, the main bearing hydrodynamic lubrication and the engine block stiffness using a system approach.