Showing papers in "Computers & Structures in 1973"

TL;DR: In this article, a numerical model is developed for the welding and subsequent loading of a fabricated structure, which treats the weld process as a thermo-mechanical problem, and the model includes finite strain effects during isothermal loading, so that it may be used in the modeling of distortion sensitive structure.

TL;DR: A general design algorithm based on methods of feasible directions is presented that is modified to improve numerical stability of the design process and is then further modified to deal efficiently with infeasible designs.

TL;DR: The boundary integral equation (BE) method as mentioned in this paper is based on a mathematical formulation which reduces the dimensionality of a problem by relating surface tractions to surface displacements and finds the stresses at any point are then found by direct quadrature from the entirety of surface data.

TL;DR: In this article, a finite element method to determine the nonlinear frequency of beams and plates for large amplitude free vibrations is presented, which is characterized by the basic stiffness, mass, geometrical stiffness and the associated inplane force matrices.

TL;DR: A matrix formulation of the reliability analysis and reliability-based design of structures is developed and can be used by designers to choose among alternative designs that satisfy all existing code regulations, and to design systems in the absence of formal code regulations.

TL;DR: In this article, the development of the structural analysis theory and procedures which are to be used in an automated minimum weight grillage synthesis program based on the SUMT solution method of nonlinear mathematical programming is described.

TL;DR: In this article, the role of the stress analysis of a human aortic valve in relation to the design of a prosthetic valve is examined using experimentally determined information to approximate the in situ loading conditions, geometry and material properties.

TL;DR: In this article, the static, vibration, and buckling analysis of axisymmetric circular plates using the finite element method is discussed, and the stiffness matrix of a typical annular plate element is derived from the given displacement function and the appropriate constitutive relations.

TL;DR: In this paper, a nonstationary stochastic process with statistical characteristics similar to actual earthquakes was developed using a random signal generator and an analog computer to simulate multistory seismic structures.

TL;DR: In this article, the authors proposed a method of overall finite element analysis of a ship structure based on the modern theory of a beam, which consists of three steps, the first of which is evaluation of various section properties, especially the torsional stiffness, and the second step is solution as well as formulation of overall stiffness equation of a given ship.

TL;DR: In this article, a technique for performing finite element elastic-plastic-creep analysis of two-dimensional continuum composed of material with temperature dependent elastic, plastic, and creep properties is presented.

TL;DR: In this paper, the response of a long concrete gravity dam-reservoir system for a harmonic rigid base acceleration normal to the dam axis is investigated, and the hydrodynamic pressure acting on the vertical wet surface of the dam is first evaluated in closed form as a function of the unknown deflections of the dams interface and the ground acceleration.

TL;DR: In this article, the finite element method is applied to the free vibration analysis of grids with arbitrary configuration, where the grid bars are of solid or thin-walled doubly symmetric cross-section.

TL;DR: In this article, a combined incremental and iterative scheme is used in such a manner that convergence to the equilibrium state is attained at each state of loading, independently of the inaccuracy which may be involved in the characterization of the preceding state.

TL;DR: In this paper, a large deflection elastic-plastic analysis is presented applicable to orthotropic axisymmetric plates and shells of revolution subjected to monotonic and cyclic loading conditions.

TL;DR: In this article, a mixed finite-difference scheme is presented for the stress and free vibration analysis of simply supported nonhomogeneous and layered orthotropic thick plates, which is based on the linear, three-dimensional theory of orthotropic elasticity and a Fourier approach is used to reduce the governing equations to six firstorder ordinary differential equations in the thickness coordinate.

TL;DR: The theory for elasto-plastic flow is recapitulated for work-hardening problems of the Mises type and an analogue to the theorem of minimum potential energy is cited, the result being an implied minimization of a functional.

TL;DR: In this paper, a technique for the optimum (minimum weight) design of a composite shell subject to constraints on its natural frequencies is presented, which is posed as a general mathematical programming problem in which one or more of the inequality constraints involves the shell natural frequencies, which must be evaluated numerically during the optimization.

TL;DR: A hypothesis of unimodality and an efficient algorithm called iterative search technique are proposed in optimizing the configurations of determinate and indeterminate trusses under multiple loading conditions.

TL;DR: In this article, the authors describe some of the principal structural features of existing and envisioned small submersibles and summarizes recent advances in design and analysis methods, including stress, stability, and vibration analyses as well as early stage developments in structural fatigue and reliability analyses.

TL;DR: In this article, it is proved that the natural frequencies of any isolated member in the system are critical values for the determinantal function, including the critical values at which the dynamic stiffness matrix is not defined.

TL;DR: A consistent procedure is developed to scan through the geometric idealization of a boundary to form regions for mesh generation based on a set of objective criteria, supported by a rigorously built mathematical model.

TL;DR: A unified bridge design optimization theory has been developed by a research team composed of personnel from the College of Engineering, Louisiana State University working in close collaboration with engineers from the Louisiana Department of Highways as discussed by the authors.

TL;DR: A development of the finite element method for thin shell instability analysis is presented in this paper, covering three principal aspects: representation of shell geometry, representation of element behavior, and algorithmic tools for solution of the large-order systems of nonlinear algebraic equations which characterize various phases of shell instability.

TL;DR: In this article, an incompatible plane elasticity finite element is developed and its computational efficiency is compared to that of related compatible elements, including the consideration of a plane stress bending problem and the extensional behavior of a thin slotted sheet.

TL;DR: In this article, the applicability of the multisegment numerical integration technique to include the solution of general macroscopically anisotropic multilayered shells of revolution is discussed.

TL;DR: In this paper, a cable-stayed girder bridge is considered for static and dynamic conditions of load, and a linear and nonlinear theory is employed to determine the effects of static conditions of loads on the bridge.

TL;DR: In this article, the initial value problem due to a transient distributed transverse force on the plate is solved using Laplace and Fourier transforms, and stress contours for various stresses and times after application of load are obtained for a graphite fiber-epoxy matrix composite plate.

TL;DR: This paper discusses the use of these for finding the first few modes of vibration of a large undamped structural system by computer by using a Sturm sequence procedure together with Chebyshev acceleration of the simultaneous iteration.

TL;DR: The capability of converting any optimization problem to a separable problem—thus facilitating the computerized description of the problem—is illustrated by aspects of the design of a vertical corrugated transverse bulkhead.