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Showing papers on "Flexural rigidity published in 1978"



Journal ArticleDOI
TL;DR: A review of the results of the long-term research work is presented in this article, where the theoretical basis of this study is the three phase structural concept, and structural and mathematical modeling of phase components, namely, soil, foundation, and superstructure is covered.
Abstract: A review of the results of the long-term research work is presented. The theoretical basis of this study is the three phase structural concept. Structural and mathematical modeling of phase components, — namely, soil, foundation, and superstructure — is covered. The elastoplastic halfspace approach is adequate to simulate the state of displacement of soil media. A three-dimensional structural analysis is required to describe the stiffness response. Tranversal flexural rigidity of the structure is derived from the height. Since soil and concrete have viscoelastic-plastic properties, loading history according to the erection process and time history following consolidation phenomena, have been investigated. Local measurements carried out on full scale models have shown a close correlation with the calculated results.

31 citations


Journal ArticleDOI
TL;DR: In this paper, a parametric study of axially loaded steel members with symmetrical rotational end springs (connections) was performed, where the main parameters were the connection flexural strength, the effective slenderness ratio, and cross-sectional properties.
Abstract: Parametric study of axially loaded steel members with symmetrical rotational end springs (connections) was performed. The main parameters are the connection flexural strength, the effective slenderness ratio, and cross-sectional properties. The rotational end spring is a simulation of the end restraint due to flexural rigidity of the connections of an axially loaded (bracing) member. The member with balanced strength connections, i.e., where plastic hinges form simultaneously at midspan and at the ends, is more efficient with respect to compressive load and energy dissipation capacities than members of the same length and same cross-sectional properties with nonbalanced strength connections. The hysteresis behavior of a balanced strength member can be adequately represented by that of a pin-connected member of the same cross section and same effective slenderness ratio.

25 citations


Journal ArticleDOI
TL;DR: In this paper, exact formulae have been obtained for determining the lowest natural frequencies and critical loads of elastic circular arches with flexibly supported ends for symmetrical vibration in the direction perpendicular to the initial curvature of the arch.

11 citations


Journal ArticleDOI
TL;DR: In this paper, the anisotropy of flexural stiffness has been examined at low strain using ASTM bar and 3mm and 6mm thick edge-gated disc injection mouldings for two glass-fibre-reinforced thermoplastics (GFTP).
Abstract: The anisotropy of flexural stiffness has been examined at low strain using ASTM bar and 3-mm and 6-mm thick edge-gated disc injection mouldings for two glass-fibre-reinforced thermoplastics (GFTP). Experimentally determined values were obtained under three-point bending and compared with theoretical prediction: which took account of the fibre orientation and length distributions in the mouldings. The flexural stiffness of the discs was also studied as a function of direction of test.The prediction of the resulting anisotropies in flexure compares well with experiment, but these anisotropies are markedly different from those measured previously in tension. It is concluded that it is necessary to have a knowledge of the fibre distribution of a GFTP moulding in order to predict successfully its mechanical properties, or to interpret measured data.

8 citations


Journal ArticleDOI
TL;DR: In this article, a simple procedure based on Love's approximate theory for wave propagation in a bar is proposed in order to consider dispersive effects in wave propagation of a thin-walled, fluid-filled, elastomer tube.
Abstract: A simple procedure, based on Love’s approximate theory [The Mathematical Theory of Elasticity (Cambridge U. P., Cambridge, England, 1927), 4th ed.] for wave propagation in a bar, is proposed in order to consider dispersive effects in wave propagation in a thin‐walled, fluid‐filled, elastomer tube. It is assumed that the perturbation from steady flow in the tube is small enough that a linearized theory is valid, and that the elastic modulus of the tube is small compared with the bulk modulus of the fluid so that compressibility of the fluid can be neglected. The flexural rigidity of the tube wall, the inertia of the tube wall, and the radial inertia of the fluid are taken into account, and an approximate expression for the dispersion relation for the fundamental mode is obtained. In order to investigate the dispersive effects, resulting from inclusion of the inertia and flexural rigidity of the tube wall and the radial inertia of the fluid in the model, an initial value problem is considered in detail. The...

8 citations


Journal ArticleDOI
TL;DR: In this article, the effect of binder levels and needle and harb variables on selected physical properties and correlation between three subjective hand properties of compactness, stiffness, and roughness and the physical properties were investigated.
Abstract: The effect of binder levels and needle and harb variables on selected physical properties and correlation between three subjective hand properties of compactness, stiffness, and roughness and the physical properties were investigated. The binder levels significantly influenced the mean values of initial modulus, rupture strength, flexural rigidity, and fabric weight. While needle variable had significant effects on the mean values of initial modulus in the machine direction and percent elongation in the cross direction, barb variable showed no significant effect on the mean values of any of the physical properties investigated. Three subjective hand properties of compactness, stiffness, and roughness were evalu ated by the paired comparison method. The correlations between these hand ratings and initial modulus, rupture strength, flexural rigidity, and fabric weight were found to be significant.

3 citations


Journal ArticleDOI
TL;DR: In this paper, a series solution has been developed to analyze continuous skew orthotropic plate structures subjected to laterally applied uniform and concentrated (patch) loads, including skew angles, flexural rigidity ratios, aspect ratios, torsional rigidities, and span ratios.
Abstract: A series solution has been developed to analyze continuous skew orthotropic plate structures subjected to laterally applied uniform and concentrated (patch) loads. Various practical skew angles, flexural rigidity ratios, aspect ratios, torsional rigidities, and span ratios are considered. The analysis is verified and substantiated by tests on model structures. A design example is given using the charts generated.

3 citations



Journal ArticleDOI
TL;DR: In this paper, the authors considered the problem of a circular elastic inclusion in a cylindrical shell subjected to internal pressure or thermal loading, and derived the boundary conditions at the shell-inclusion junction in a simple form involving inplane strains and change in curvature.

2 citations


Journal ArticleDOI
TL;DR: In this paper, the buckling coefficient of a stiffened shear web with uniform, equally-spaced stiffeners is analyzed for clamped and simply-supported longitudinal edges.
Abstract: A stiffened shear web, consisting of a thin plate (referred to simply as the web) attached to longitudinal members (or flanges) and supported by a series of transverse stiffeners, buckles in a mode involving both the web and stiffeners, at a shear stress which also depends on the restraint between the web and flanges. With increasing stiffener size changes in the mode of buckling occur until, at a certain critical value of the flexural stiffness of the stiffener, buckling is largely confined to the web between stiffeners, and the buckling coefficient is then practically constant. The buckling coefficient reduces to that of an unstiffened flat plate with decreasing stiffener size. Engineering Sciences Data Item 02.03.02 plots buckling coefficients for long shear webs with uniform, equally-spaced stiffeners. The curves are based on work by Stein and Fralich, for stiffeners of zero torsional rigidity and simply-supported longitudinal edges, and on a more recent series of papers by Cook and Rockey (listed in the Data Item) which extend the analysis to clamped, as well as simply-supported, webs and also include the torsional rigidity of the stiffeners.

Patent
27 Jun 1978
TL;DR: In this paper, the authors propose to provide a housing high in flexural rigidity and tosional rigidity with relatively limited material by sticking material together immediately inside the enclosing board forming a box or a cylinder.
Abstract: PURPOSE:To provide a housing high in flexural rigidity and tosional rigidity with relatively limited material, by sticking material together immediately inside the enclosing board forming a box or a cylinder so that a part or the whole of the enclosing board is make double-or multi-laminated.