scispace - formally typeset
Search or ask a question

Showing papers in "Computers & Structures in 1993"


Journal ArticleDOI
TL;DR: In this paper, a simple evolutionary procedure is proposed for shape and layout optimization of structures, where low stressed material is progressively eliminated from the structure during the evolution process, and various examples are presented to illustrate the optimum structural shapes and layouts achieved by this procedure.

1,975 citations


Journal ArticleDOI
TL;DR: A numerical test on whether the inf-sup condition for the finite element solution of problems in incompressible elasticity is passed will prove useful for many discretizations of constrained variational problems.

315 citations


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

258 citations


Journal ArticleDOI
TL;DR: In this paper, an application of the dual boundary element method to the analysis of mixed-mode crack growth in linear elastic fracture mechanics is described, where crack-growth processes are simulated with an incremental crack-extension analysis based on the maximum principal stress criterion which is expressed in terms of the stress intensity factors.

191 citations


Journal ArticleDOI
TL;DR: In this article, a set of mathematically complete two-dimensional polynomials are assumed in the displacement and rotational functions to approximate the appropriate mode shapes, and the energy function derived using Mindlin's plate theory is minimized using the Rayleigh-Ritz procedure which leads to the governing eigenvalue equations.

164 citations


Journal ArticleDOI
TL;DR: In this paper, a finite element computation procedure for determining the initial shape of cable-stayed bridges under the action of the dead load of girders and pretension in inclined cables is presented.

135 citations


Journal ArticleDOI
TL;DR: In this paper, an exact static analysis of a simply supported intelligent structure under cylindrical bending is presented, where the performance of the actuator layer of the intelligent structure to cause induced axial and transverse stresses in the substrate layer is investigated.

121 citations


Journal ArticleDOI
TL;DR: In this paper, a typical structure is that whose basic layer is covered with a damping layer and a thin constraining layer, which is used in ship building and aerospace technology.

121 citations


Journal ArticleDOI
TL;DR: The Delaunay scheme permits certain edges to be specified in the final triangulation, such as those that correspond to domain boundaries or natural interfaces, and is suitable for mesh generation and contour plotting applications.

119 citations


Journal ArticleDOI
TL;DR: In this paper, an experimental and numerical investigation is carried out for a particular testing geometry: a single-edge notched specimen subjected to four-point shear, where a mixed-mode crack propagation is activated in concrete, if the specimen is not too small and the aggregates are not too large.

107 citations


Journal ArticleDOI
TL;DR: In this article, the authors developed effective, general methods for sizing optimization of acoustically radiating structures using mathematical programming techniques, and used the CONMIN optimization program to find the optimal thickness distribution of flat plates with clamped edges.

Journal ArticleDOI
TL;DR: In this paper, an application of the return mapping algorithm for the inviscid two invariant cap model, originally proposed by DiMaggio and Sandler, is presented.

Journal ArticleDOI
TL;DR: In this paper, a new approach to apply the differential quadrature method to the deflection, buckling, and free vibration analysis of beams and plates with various boundary conditions is presented.

Journal ArticleDOI
TL;DR: In this paper, a general quadrilateral multilayered anisotropic plate element is formulated on the basis of a refined third-order shear deformation plate theory, which makes use of a displacement field that fulfils a priori the geometric and stress continuity conditions at the interfaces between the layers.

Journal ArticleDOI
TL;DR: In this paper, a method is developed for the estimation of structural damage using measured changes in the natural frequencies, where the relationship of the variation in the eigenvalues to localized reductions in the stiffness of the undamaged structure is a set of underdetermined simultaneous equations derived from the first-order perturbation of the Eigenvalue problem.

Journal ArticleDOI
TL;DR: In this article, the nonlinear dynamic response of a cylinder subjected to a side-on, far-field underwater explosion was studied using both numerical and experimental techniques, and the results indicated that the dynamic motion of the cylinder has an accordion mode, a breathing mode and a whipping mode.

Journal ArticleDOI
TL;DR: In this article, an arbitrary Lagrangian-Eulerian formulation using the velocity potential and the density as fluid variables is proposed for large boundary motions. But it is not suitable for the case of very large boundary motion.

Journal ArticleDOI
TL;DR: In this article, a numerical method based on the Rayleigh method for predicting the natural frequencies of a rectangular plate with a centrally located crack is presented, and the effects of transverse shear deformation and rotary inertia are included by applying the dynamic equivalent of the simplified Reissner theory.

Journal ArticleDOI
TL;DR: In this article, a nonlinear finite-element model using ADINA was developed to simulate the static and transient dynamic responses of the physical model and compared its predictions with the experimental results from a typical case.

Journal ArticleDOI
TL;DR: The application of artificial neural networks to capture structural design expertise is demonstrated and neural net prediction of optimum designs was found to be satisfactory for the majority of the output design parameters.

Journal ArticleDOI
TL;DR: In this article, a compound finite element model is developed to investigate eccentrically stiffened plates in free vibration, where the plate elements and beam elements are treated as integral parts of a compound section, and not as independent bending components.

Journal ArticleDOI
TL;DR: In this paper, a general solution to vibrations of beams on variable Winkler elastic foundation is presented, where the exact solution of the dynamic response of the beam is obtained by considering the reaction force of the foundation on the beam as the external force acting on the beacon, which is an integral equation including the displacement of the beacon.

Journal ArticleDOI
TL;DR: In this article, high-order reliability bounds for series systems are derived, which, based on all the single mode failure probabilities and all the two-mode, three-mode and higher-mode joint failure probabilities, can greatly improve the accuracy of reliability calculation.

Journal ArticleDOI
TL;DR: Two versions of the arc-length method (Crisfield and Ramm) are presented and compared using a geometrical interpretation, and a new method, called the modified Crisfield-Ramm method, is proposed.

Journal ArticleDOI
TL;DR: The Newton-Raphson and the stress-integration algorithms are presented along with the necessary extensions to the existing objects to demonstrate the advantage of object-oriented programming, in particular through the concept of non-anticipation of the state of the object.

Journal ArticleDOI
TL;DR: In this article, splitting-tension tests were conducted on 2-in. diameter concrete specimens in a Split Hopkinson pressure bar at strain rates of 4.4, 10.6, and 14.7/sec.

Journal ArticleDOI
TL;DR: In this paper, a simple penalty method for contact-impact problems is presented in detail, with the focus on the difficulties of implementation of penalty approaches in contact impact simulations, and a penalty stiffness matrix of the fictitious contact element, not depending on the type of adjacent elements, is derived.

Journal ArticleDOI
TL;DR: In this paper, a computational approach is presented for the analysis of reinforced concrete beams and slabs under the effects of transient uniformly distributed loads, based on the Timoshenko beam formulation with non-ideal support conditions.

Journal ArticleDOI
TL;DR: In this paper, exact solutions for the title problem are presented for general boundary conditions, but no numerical frequencies are presented using these solutions, instead natural frequencies are obtained using the Ritz method.

Journal ArticleDOI
TL;DR: In this paper, a general Stewart platform robotic manipulator, which consists of a base platform, a mobile platform, and six flexible actuators connecting these platforms, has been considered and a set of 12 Lagrange equations for flexible Stewart platform manipulators has been rigorously derived by using tensor representation.