Showing papers in "Journal of Engineering Mechanics-asce in 1959"
TL;DR: In this paper, the method is capable of application to structures of any degree of complication, with any relationship between force and displacement, from linear elastic behavior through various degrees of inelastic behavior or plastic response, up to failure; any type of dynamic loading, due to shock or impact, vibration, earthquake, or nuclear blast can be considered.
Abstract: Method is capable of application to structures of any degree of complication, with any relationship between force and displacement, from linear elastic behavior through various degrees of inelastic behavior or plastic response, up to failure; any type of dynamic loading, due to shock or impact, vibration, earthquake, or nuclear blast can be considered; use of high-speed digital computers.
4,176 citations
TL;DR: In this article, response spectrum curves are used to describe the behavior of earthquake and period and damping of structure, high elastic stresses are developed during strong ground motion; type of limit design is indicated.
Abstract: Behavior is described by response spectrum curves which show effect of size and distance of earthquake and period and damping of structure; high elastic stresses are developed during strong ground motion; type of limit design is indicated.
392 citations
TL;DR: Interaction curves relating axial thrust, applied end bending moment, and slenderness ratio, developed for ultimate carrying capacity of pin ended, wide flange beam columns; assumed symmetrical residual stress pattern considered in calculations; interaction curves are fitted into approximate equations; comparison with various column test results.
Abstract: Interaction curves relating axial thrust, applied end bending moment, and slenderness ratio, developed for ultimate carrying capacity of pin ended, wide flange beam columns; assumed symmetrical residual stress pattern considered in calculations; interaction curves are fitted into approximate equations; comparison with various column test results.
152 citations
TL;DR: In this paper, a system of equations governing nonlinear bending of plates consisting of two or more bonded thin layers is presented, and the effects of both transverse and in-plane loading and thermal gradients through plate thickness as well as over plate faces are given.
Abstract: System of equations governing nonlinear bending of plates consisting of two or more bonded thin layers; effects of both transverse and in-plane loading and thermal gradients through plate thickness as well as over plate faces are given; specialization of equations for particular classes of problems.
72 citations
TL;DR: In this article, the discharge of stratified fluid through horizontal slot at end of channel was studied and experiments showed that when densimetric Froude number is less than 0.28 flow pattern is divided into two horizontal regions; stagnant upper region and lower region in which entire discharge is concentrated.
Abstract: Study of discharge of stratified fluid through horizontal slot at end of channel; experiments show that when densimetric Froude number is less than 0.28 flow pattern is divided into two horizontal regions; stagnant upper region and lower region in which entire discharge is concentrated; results obtained are useful for solution of engineering problems involving stratified flows.
51 citations
TL;DR: Two independent studies related aspects of resistance of bluff body to periodic motion of surrounding fluid were investigated and provide clear distinction between effects due to velocity and those due to acceleration as well as insight into their variations during unsteady flow.
Abstract: In two independent studies related aspects of resistance of bluff body to periodic motion of surrounding fluid were investigated; in combination, studies provide clear distinction between effects due to velocity and those due to acceleration as well as some insight into their variations during unsteady flow.
18 citations
TL;DR: In this paper, the analysis of stress and deformation of subgrade strengthened by flexible surface plate subjected to load distribution is presented. And the application of linear viscoelastic theory is discussed for constant loads suddenly applied and maintained.
Abstract: Analysis of stress and deformation of subgrade strengthened by flexible surface plate subjected to load distribution; application of linear viscoelastic theory; particular examples for constant loads suddenly applied and maintained; pertinence to design of column footings and airport pavements.
11 citations
TL;DR: In this paper, active water theory is presented; it attributes phenomena considered to stress condition in film of water surrounding cement grains when cement is moist; theory agrees well with several aspects of cement behavior in course of shrinkage and swelling; it also provides convincing explanation for creep.
Abstract: Reference is made to author's previous article, indexed in Engineering index 1958 p 175; active water theory is presented; it attributes phenomena considered to stress condition in film of water surrounding cement grains when cement is moist; theory agrees well with several aspects of cement behavior in course of shrinkage and swelling; it also provides convincing explanation for creep.
9 citations
TL;DR: In this paper, the agreement of deflections and moments as found by the two methods is good, maximum variations being about ten percent, and the Moire method, with possible improvements in technique, offers a useful tool, along with numerical methods, for the future study of plates.
Abstract: In the work reported in this paper, certain laterally loaded thin plates were studied experimentally, using the Moire method, and analytically, by finite differences. The procedures followed in the study are summarized, the results are presented, and possible sources of error in the Moire technique are discussed. In general, the agreement of deflections and moments as found by the two methods is good, maximum variations being about ten percent. It is concluded that the Moire method, with possible improvements in technique, offers a useful tool, along with numerical methods, for the future study of plates.
6 citations
TL;DR: In this paper, an electrical analogue has been designed to simulate damped single degree of freedom for elasto-plastic structure subjected to earthquake; yield displacement spectra of 1940 El Centro, Calif, earthquake are shown.
Abstract: Electrical analogue has been designed to simulate damped single degree of freedom for elasto-plastic structure subjected to earthquake; yield displacement spectra of 1940 El Centro, Calif, earthquake are shown.
5 citations
TL;DR: In this paper, the problem of steady seepage flow under gravity from a canal into a semi-pervious clay layer of finite thickness underlain by a freely permeable layer of sand and gravel in which the piezometric head is very near the canal water level is considered.
Abstract: This paper deals with the two-dimensional problem of steady seepage flow under gravity from a canal into a semi-pervious clay layer of finite thickness underlain by a freely permeable layer of sand and gravel in which the piezometric head is very near the canal water level. Two steps of conformal mapping are used and an approximation to the canal profile is adopted. In this approximation the specified canal width and depth are untouched.
TL;DR: In this paper, the authors derived criteria derived by determining analytically value of extreme compression edge strain which results in maximum value of moment or load; following rectangular members are considered: homogeneous beams, reinforced concrete beams, and eccentrically loaded reinforced concrete columns; ultimate strength so derived is in agreement with tests
Abstract: Criteria derived by determining analytically value of extreme compression edge strain which results in maximum value of moment or load; following rectangular members are considered: homogeneous beams, reinforced concrete beams, and eccentrically loaded reinforced concrete columns; ultimate strength so derived is in agreement with tests.
TL;DR: In this article, closed form solutions to difference equations are obtained by substituting standard force joint deformation relations into general joint equilibrium equations, complete solutions are obtained for regular parallel chord Vierendeel and triangulated trusses with n panels.
Abstract: Advantages of using closed form solutions to difference equations as tool for structural analysis; in solving directly, difference equations are obtained by substituting standard force joint deformation relations into general joint equilibrium equations, complete solutions are obtained for regular parallel chord Vierendeel and triangulated trusses with n panels.
TL;DR: In this article, a theory based on strain energy considerations was presented for determining buckling pressures of shallow shells under external pressure; it is suggested that results may be extended to deeper shells.
Abstract: Previous theoretical work reviewed; theory, based on strain energy considerations, presented for determining buckling pressures of shallow shells under external pressure; it is suggested that results may be extended to deeper shells
TL;DR: Considerable simplification results when following steps are used singly or in combination: special arrangement of variables in determinant form, selection of repeating variables to represent dynamic, kinematic and geometric variables.
Abstract: Considerable simplification results when following steps are used singly or in combination: (1) special arrangement of variables in determinant form; (2) selection of repeating variables to represent dynamic, kinematic and geometric variables; dimensional analysis provides partial solution without revealing inner phenomena; dimensionless coefficients used to obtain similarity between model and prototype; example given of analyzing drag on ship.
TL;DR: In this article, the design of beams in which torsion occurs, usually due to an eccentricity of the applied load, is either crudely approximated or, if studied accurately, involves the use of hyperbolic functions.
Abstract: The design of beams in which torsion occurs, usually due to an eccentricity of the applied load, is either crudely approximated or, if studied accurately, involves the use of hyperbolic functions. This paper shows how simple beam formulas can be extended to deal with torsion and how, by considering torsional rigidity and torsion-bending rigidity separately, results of acceptable accuracy can be obtained.
TL;DR: The motion of the neutral axis in symmetrical pure bending of beams in plasticity is discussed in this article, where both perfectly plastic beams and beams with linear strain hardening are considered.
Abstract: The motion of the neutral axis in symmetrical pure bending of beams in plasticity is discussed. Both perfectly plastic beams and beams with linear strain hardening are considered. A method is given by means of which it is possible to correlate in a simple manner the motion of the neutral axis with the motion of the elastic-plastic boundaries. Formulas are found for the motion of the neutral axis with increasing curvature. Conditions are established for reversal of direction of motion of neutral axis.