Showing papers in "Computers & Structures in 1995"

TL;DR: In this paper, a local continuum damage theory and two distinct nonlocal variants are applied to model the failure behaviour of a construction made of macroscopically brittle material, and numerical implementation of the approaches has been performed in a finite element code.

TL;DR: In this paper, a set-theoretical, convex description of uncertainty is discussed in detail, where uncertainty is described as a set of constraints unlike the classical probabilistic approach, and instead of conventional optimization studies, where the minimum possible responses are sought, here an uncertainty modeling is developed as an "anti-optimization" problem of finding the least favorable response under the constraints within the set theoretical description.

TL;DR: In this paper, a simple hyperbolic yield surface that eliminates the singular tip from the Mohr-Coulomb surface is presented, which is suitable for finite element programming with either explicit or implicit stress integration schemes.

TL;DR: In this article, a two-stage mapping process is constructed by the mapping relationships between unsigned decimal integers and discrete values, which can significantly reduce the computational effort and promote the computational efficiency.

TL;DR: In this paper, extensions of Rayleigh damping are proposed in terms of a double series, which provides more choices in formulating a damping matrix, and two sets of empirically obtained data are utilized as examples to illustrate the derived formulations.

TL;DR: In this paper, a new approach is introduced, in which the stresses are calculated at points other than the SPH nodes, to address the tension instability of SPH, and the results from applying the unconventional approach to a simple bar are very encouraging.

TL;DR: The key issues addressed by Matcher are described and the underlying parallel algorithm, which generates the data structures needed for handling arbitrary and non-conforming fluid/structure interfaces in aeroelastic computations, is described.

TL;DR: In this article, a computer procedure is described for the cross-section analysis and elastic buckling analysis of thin-walled structural members, which can be done for a number of different buckle halfwavelengths of the member and the load factor and buckled shape are output for each length.

TL;DR: In this paper, a neural dynamics model is presented for optimal design of structures, which consists of two distinct layers: a variable layer and a constraint layer, where the number of nodes in the variable and constraint layers correspond to the numbers of design variables and constraints in the structural optimization problem.

TL;DR: In this paper, a multilayer perceptron (MLP) was used for the detection of structural damage and identification of damaged element in a large complex structure is a challenging task.

TL;DR: It is shown, based on the schemata theorem, that the use of the topological bit leads to rapid convergence of the solution to an optimal topology with small number of members.

TL;DR: The ADINA-F capabilities for fluid flow analysis are described in this paper, where the basic formulations and finite element discretizations used are described, the techniques for the solution of the finite element equations are briefly discussed, and the results of various demonstrative analyses are given.

TL;DR: In this article, a finite element idealization is presented to analyze galloping, which is characterized by large amplitude vibrations of iced, multi-span, electrical transmission lines, and an expedient time marching scheme is developed to obtain the envelope of galloping.

TL;DR: In this article, a new formulation based on a three-field discretization using displacements, pressure and a "vorticity moment" as variables with an appropriate treatment of the boundary conditions was proposed.

TL;DR: The application of genetic algorithms to integrated discrete and configuration optimization of trusses is presented, mathematically formulated as a constrained nonlinear optimization problem with a mix of discrete sizing and continuous configuration variables.

TL;DR: In this paper, a three-dimensional finite element model is developed for cable-stayed bridges under static and dynamic loadings based on the total Lagrangian formulation, which can account for the large displacements that are usually associated with extended in plane contemporary cable-supported structures.

TL;DR: In this paper, a finite strip method of analysis is developed which enables the elastic local buckling of plates and plate structures with different boundary conditions along the loaded ends to be studied, and the stability or geometric matrix is derived and presented in the paper.

TL;DR: In this article, a finite element elasto-viscoplastic solution is presented for a general bearing capacity problem of strip and circular surface footings, where a Mohr-Coulomb yield criterion has been assumed for the soil behaviour.

TL;DR: In this paper, the free vibration frequencies of Timoshenko beams on two-parameter elastic foundations were examined and two variants of the equation of motion were deduced, in which the second foundation parameter is a function of the total rotation of the beam or a function due to bending only, respectively.

TL;DR: In this article, the linear flexural stiffness, incremental stiffness, mass, and consistent force matrices for a simple two-node Timoshenko beam element are developed based upon Hamilton's principle, where interdependent cubic and quadratic polynomials are used for the transverse and rotational displacements, respectively.

TL;DR: In this paper, a high precision direct (HPD) integration scheme is presented, where nonlinearly varying loadings are decomposed into Fourier components before direct integration, so that accurate responses to each harmonic loading component can be obtained even for very large time-step sizes.

TL;DR: In this paper, three mode types are proposed for reducing nonlinear dynamical system equations, resulting from finite element discretizations: tangent modes, modal derivatives, and newly added static modes.

TL;DR: In this paper, a general formulation for frame analysis based on "lumped dissipation models" and continuum damage mechanics is presented and a particular model for RC frames based on this framework is proposed and the numerical implementation of simplified damage models in commercial finite element programs is described.

TL;DR: In this article, a neural dynamics model for optimization of structures by integrating penalty function method, Lyapunov stability theorem, Kuhn-Tucker condition, and the neural dynamics concept is presented.

TL;DR: In this paper, a hybrid FEM-BEM method is developed to solve the coupled electrostatics and mechanics equations, and sensitivity analysis is carried out using the direct differentiation approach (DDA) to compute the design sensitivity coefficients (DSCs).

TL;DR: In this article, an optimization approach on laminate configurations of symmetrically laminated plates to maximize buckling loads under combined loading is presented, where the coupling between bending and twisting is taken into consideration in the buckling analysis of symmetric laminated plate.

TL;DR: In this article, the authors expand the existing database of semi-rigid steel connections at Purdue University by including additional test data on header-plate and seat-angle, and double-web and seatangle connections.

TL;DR: In this article, a finite element software, ADINA, was used to predict the phase transformation of a workpiece subjected to surface grinding, and some efficient solution strategies were proposed to obtain reliable predictions for different grinding conditions and work material properties.

TL;DR: In this paper, simple two-noded and three-nodes general curved beam elements have been formulated on the basis of assumed strain fields and Timoshenko's beam theory, and it is shown that these elements give better convergent characteristics than the modified isoparametric curve elements that have been shown in existing studies.

TL;DR: The concepts, models and methods developed in this research have been applied to the solution of a complex engineering problem, the interlaminar stress analysis of composite laminates.