ICE - Institution of Civil Engineers - Virtual Library

7308 Coupled hydrodynamic response of a gravity dam B. NATH, BTech, PhD' This Paper contains a comprehensive study of the damped forced motion a gravity of dam during horizontal ground motions. Interaction of the structural deformations of the dam on the hydrodynamic pressures on it has been accounted for; radiation damping in the fluid phase has been ignoredand the structural damping of the dam has been expressed in terms of an equivalent viscous damping parameter. Coupled response of the dam thus obtained is found to be greater than that due to the conventionalrigiddam assumption; dampeddeflexionresponsewas found to be a maximum under reservoir-full the condition, decreasing reduced with reservoir depth; also, response was severely attenuated by damping at relatively high frequencies of motion...

Numerical elastic analysis of coupled shear walls Following the technique in which discrete cross-beamsare replaced by an equivalent continuous medium, a numerical approach, based upon matrix progression formulation, is presented for the analysis of coupled shear wall structures containing any height. The results obtained number of walls and any number of discontinuities in the by this method are compared with those obtained from tests on Araldite models. Notation clear span of members connecting wall i with wall i + l depth of wall i spacing of cross-beams connecting wall i with wall i+l lateral distance between centroidal axes of wall i and wall i+l lateral load applied to the wall system vertical shearing force/unit length between wall i and wall i+l vertical displacement of centroid of wall i lateral displacement of the walls co-ordinate measured vertically from base total cross-sectional area of walls (ZA,) cross-sectional area of wall i Young's modulus of the material shear modulus of the material sum of the second moments of areas of the cross-sections of the wall (,Ul) second moment of area of cross-section of wall i second moment of area of cross-section of the members connecting wallto i wall i +1 total bending moment in the walls (ZM1) bending moment carried by wall i total horizontal shear force in the walls @Sl) horizontal shear force in wall i vertical tensile force in wall i rotation of normal cross-section of wall Introduction During recent years there have been many studiesthe stresses and deflexions of in coupled shear wall systems...

Pror. Jnsrn Civ. Engrs, Part 2, 1979, 67, Sept., 589-596 8174 between Interaction coupled shear walls and frames K. ARVIDSSON, MSC* A method is presented for the analysis of interacting coupled shear walls and frames. The analysis is based on the continuous connection technique, whereby the high degree of static indeterminabilityin a shear wall-framesystem is reduced to a differential equation which is easy to solve. Secondary design effects, such as column shortening intheframe and elastic foundationconditions, are alsotaken into account.Two examples are given for a uniformly distributed load...

Papers.] CRIDLAN ON AUTO!dATIC UOUPLING. 377 (Students' Paper No, 464.)' CAbl.iagea.) " Automatic Coupling." By JOHN O ~ E L LI CRIDLAN, Stud. Inst. C.E. the many branches of railway servants' work there is probably none more dangerous than that of shunting, which consists chie0y of coupling uncoupling and vehicles. For many years the attention of the general public has been drawn to the serious loss of life, andtothenumber of accidents,amongst shuntersand others in the prosecution of their employment, and the question has often been asked whether it were not possible to safeguard the men engaged in this hazardous occupation by the substitution of some improved method of coupling for that in existence at present on the railways of the United Kingdom...

Proc. Instn Ciu. Engrs, Part 2, 1916, 61, June, 331-342 7897 Cyclic load tests on shear wall coupling beams A. W. IRWIN, BSc, PhD* A. E. C. ORD, BSC* Results of cyclic load tests on a number of small-scale reinforced concrete coupled shear wall units are reported. The test units had a range of coupling beam depths and percentagereinforcement.Theelasto-plasticcyclesimposedontheseunitsweredesigned to simulate the stress and deflexion pattern appropriate to thathighly stressed a of connecting beam in a coupled shear wall system which is subject to large oscillating lateral forces...

Proc. Insrn Civ. Engrs, Part 2, 1977, 63, June, 509-51 1 7967 DISCUSSION Torsional performance of coupled channels in tall buildings A. W. IRWlN & N. ANDREW Mr V. K. Khanna, Engineers India Ltd The Authors present very useful results based on experimental elastic and elasto-plastic torsional tests on models of coupled channels. The results are based on terminal torsion and single level torsion. Uniformly distributed torsion has not been considered. A combination of these loadings should simulate earthquake effect...

Non-planar coupled shear walls in multistorey buildings K. Arvidsson, DrScEng Proc. Instn Civ. Engrs Structs & Bldgs, 1997, 122, Aug., 326 333 Paper 11195 Written discussion closes 15 October 1997 s This paper presents a method for the analysis of three-dimensional (3-D) structures consisting of non-planar coupled shear walls and homogeneous walls. The theor y of analysis is based on the continuum theor y of planar coupled shear walls extended to the analysis of non-planar coupled shear walls by taking into account both the flexural and the torsional behaviour of such walls...

7308 DISCUSSION Coupled hydrodynamic response of a gravity dam B. NATH A. Selby, University of Bristol The major advance madeby the Author and outlined in his Paper is the development of an analytical method to predict reservoir-dam interaction during sinusoidal motion of the system allowing for compressibility of water in the reservoir. 46. The effect of compressibility of water is that pressure waves in the reservoir generated by acceleration of the dam or the valley can, in theory, tend to very large values if the excitation frequency approaches the resonant frequency of these waves...

Proc. Insrn Ciu. Engrs, Part 2, 1975,59, Mar., 209-213 7720 DISCUSSION Free vibrations of coupled shear walls on flexible bases P. R. MUKHERJEE & A. COULL Mr H. Tottenham, Hume Tottenham and Bennett In their analysis the Authors assume that the vertical forces in each of the walls are of equal magnitude but of opposite sign, as is the case for static horizontal loading. At first sight it might appear thatthis is not strictly true when vertical inertia loads(which are proportional to the cross-sectional areas of the walls as well as the vertical accelerations) are considered...

7113 ABSTRACT Coupled plane shear walls of tapered thickness D. MICHAEL, BSC, PhD' Introduction Load bearing walls coupled in their own planeform anefficient wind resisting structure for tall buildings. They have a relatively large base width and are precompressed by their vertical loads. For medium building heights, say up to 250ft, it is reasonable to maintain a constant wall thickness at all levels. The walls are in any case comparatively thin and standardizationrequirements preclude many variations. At greater heights can advantageous it be to reduce the wall thicknesses to save materialand to reduce weight...