Showing papers in "Computers & Structures in 1980"

TL;DR: The FIDAM code as discussed by the authors is a system of computer programs designed for the solution of two-dimensional, linear and nonlinear, elliptic problems and three-dimensional parabolic problems.

TL;DR: In this article, a generic stochastic finite-element method for modeling structures is proposed as a means to analyze and design structures in a probabilistic framework, which is applied in structures discretized with the finite element methodology, and an estimate of the probability of failure based on known and established procedures in second-moment reliability analysis is made with the aid of a transformation to gaussian space of the random variables that define structural reliability.

TL;DR: In this article, a displacement-based finite element is presented for linear and geometric and material nonlinear analysis of plates and shells, which can be implemented as a variable-number-nodes element and can also be employed as a fully compatible transition element to model shell intersections.

TL;DR: In this article, a finite element analysis of the geometrically nonlinear behaviour of plates using a Mindlin formulation with the assumption of small rotations is presented, and a comparison of the performance of Linear, Serendipity, Lagrangian and Heterosis elements is given for square, skew, circular and elliptical plates subjected to distributed and point loading.

TL;DR: In this article, the use of the current stiffness parameter for characterizing nonlinear systems is discussed and some new formulations and applications of this parameter are suggested, and a new class of solution techniques utilizing simultaneous iteration on the loading parameter as well as the displacements is also proposed.

TL;DR: Computational methods for fluid-structure analysis are surveyed, and emphasis is placed on semi-discretization methods, such as finite element and finite difference methods.

TL;DR: In this article, a simplified method for the dynamic analysis of plates with cutouts is presented, which is based on Rayleigh's principle and has been demonstrated for the case of simply supported square plates with square and rectangular cutouts.

TL;DR: In this paper, the authors describe the application of a curved isoparametric shell element to large displacement analyses including instability phenomena, using a total Lagrangian formulation using the standard incremental/iterative solution procedure.

TL;DR: In this article, the shape of the cross section is defined by 5th degree polynomial which is completely determined by the boundary conditions and four design variables and the stress analysis of the disk is carried out by finite element method using isoparametric elements.

TL;DR: In this article, an analysis of the contact problems between elastic bodies without friction is presented, where kinematically admissible displacement fields are subjected to the noninterpenetration conditions so that the contact problem being equivalent to a minimization of the potential energy with contraints on the displacements may be reduced to a particular case of the mathematical programming techniques.

TL;DR: In this article, a four-node isoparametric mixed quadrilateral element is developed for large deflection dynamic analysis of plates, which includes the effect of transverse shear deformations as in Reissner plate theory.

TL;DR: In this paper, new and recently developed concepts useful for obtaining and solving equations of motion of multibody mechanical systems with translation between the respective bodies of the system, are presented.

TL;DR: The midpoint difference method for elastic deformation of a beam supported on an elastic, nonlinear foundation with rigid or elastic descrete supports is presented in this article, where an iterative approach is used in solving the nonlinear problem; a weighted averaging scheme is employed to speed up the convergence to a solution.

TL;DR: In this paper, finite element analysis of the equations governing the small-deflection elastic behavior of thin plates laminated of anisotropic bimodulus materials (which have different elastic stiffnesses depending upon the sign of the fiber-direction strain) is presented.

TL;DR: The plane stress program is used for analysis of a beam and two different corbels, while the shell program has been applied to a square plate and a shell with geometric nonlinearities.

TL;DR: In this paper, a finite strip analysis of the vibration of rectangular Mindlin plates with general boundary conditions is described, where the normal modes of vibration of Timoshenko beams are used to represent the spatial variation along a strip of the deflection and the two cross-sectional rotations.

TL;DR: A personal view of the origins of the finite element method is presented, describing the sequence of events at Berkeley, and the state-of-the-art of structural dynamic analysis is discussed, with mention of important recent advances.

TL;DR: In this paper, a hybrid-stress-based finite-element formulation for thick multilayer laminates is presented and evaluated, with particular attention given to the through-thickness distributions assumed for both stress and displacement components.

TL;DR: In this paper, a finite element solution for a circular ring or curved beam is developed for a polynomial displacement function, which gives high accuracy for an element which subtends an angle as great as 90°.

TL;DR: In this paper, the complicated geometry, support conditions, loading sequence and applications of steel connections fabricated with high-strength, pretensioned bolts, have been modelled by finite element techniques.

TL;DR: In this article, the design optimization of axially loaded, simply supported stiffened conical shells for minimum weight is considered, the design variables are thickness of shell wall, thicknesses and depths of rings and stringers, number/spacing of rings, and number of stringers.

TL;DR: In this article, a finite element Mindlin shallow shell formulation was proposed and compared to a previous flat plate formulation, it was shown that the addition of a shallow shell capability added very little extra computational effort.

TL;DR: In this article, the authors considered the problem of determining the mass distribution of a cantilever column subject to a compressive follower force, which maximizes its critical load of dynamic stability under the constraint of a specified total mass.

TL;DR: The techniques of chance constrained programming are applied to solve the resulting stochastic optimization problem and the optimum results obtained from the probabilistic formulation are compared with those given by the deterministic formulation.

TL;DR: In this paper, a bilinear stress-strain curve with a modulus E t in tension and E c in compression was used to model the nonlinear behavior of composite materials under bending loads.

TL;DR: A hybrid optimality criterion is developed by using both zero and first order approximations of the stress constraints, according to their criticality, which appears to be closely related to the linearization methods of mathematical programming.

TL;DR: In this paper, a finite element formulation for stability problems of structures assembled from thin-walled members with open crosssection is presented, and the contribution of bimoment toward stability of unsymmetrical sections is included.

TL;DR: In this article, a new simple design formula for the ultimate strength of simply supported plates in transverse compression is proposed and a parametric study of plates with aspect ratio 3 subject to biaxial compression is performed.

TL;DR: In this paper, the suitability of lumped masses for elastic wave propagation problems in beams is investigated, and dispersion relations are presented for lumped mass Euler-Bernoulli elements and an element with shear correction.

TL;DR: In this paper, the buckling loads for tapered and stepped columns have been determined by a finite difference method using a matrix iteration solution technique (a BASIC program for which is appended).