Showing papers on "Shear wall published in 1974"

Ductility of coupled shear walls

Abstract: In this project the strength and behaviour of coupled shear walls subjected to seismic type of lateral load are examined. The sensitivity of shear wall response to changes in relative stiffnesses of beams and walls, and the effects of cracking are studied. Using a finite difference approximation the application of laminar analysis is extended to coupled walls with variation in properties of beams and walls with height, different boundary conditions, different pattern of loading and two or more rOws of openings. Theoretical approaches are suggested for the estimation of strength and post-cracking stiffnesses of beams and walls. Using these approaches, with the aid of finite difference approximation of the laminar technique, the history of the shear wall's behaviour is followed by an incremental non-linear elasto-plastic analysis which exposes the ductility requirements of beam and wall hinges and reveals the sequence of their yielding. Two quarter full size seven storey reinforced concrete coupled shear wall mOdels, with differently reinforced coupling beams, have been tested under static reversed cyclic loading to simulate seismic effects. The experiments revealed that carefully designed and detailed shear walls can possess adequate ductility to give the desirable protection against catastrophic ground shaking. The shear wall model with diagonally reinforced beams exhibited superior stiffness, ductility and energy dissipation characteristics. Finally, the significant findings of this investigation have been translated into design recommendations for coupled shear wall

Three-Dimensional Analysis of Shear Wall Buildings to Lateral Load

Abstract: An approach to study the flexural and torsional deformation of multistory shear wall buildings for lateral loading has been presented. The out-of-plane stiffness of the floor side is taken into account by means of connecting beams. The problem is described in terms of three generalized displacement functions of the structure. No restriction is placed on the complexity of the floor plan layout. An example is worked out to show the importance of floor slab stiffness and comparisons are made with the results based on the finite element approach.

Design of vertical keyed shear joints in large panel buildings

Abstract: Designing large-panel buildings for stability against wind loads presents complications when the shear walls are themselves of panel construction, since the joints have strength and stiffness characteristics different from those of the panels The problem has been examined in tests carried out in many countries which are now evaluated in this considered report by members of CIB Working Commission W23A

Stiffening of Shear Walls

Abstract: In interacting shear wall and flat slab-column construction it is desirable to be able to evaluate the contribution of the columns to the stiffness of the lateral load resisting system. This paper presents a relatively simple method whereby this contribution can be determined, both in terms of the reduction in lateral displacement and the reduction in overturning moment in the shear walls. For the case of a continuous flat slab connection, the bending of the slab induces axial forces into the exterior columns, which therefore causes a portion of the moment to be carried by the columns. Axial forces can also be induced into the exterior columns by means of a very stiff top beam extending from the shear wall to the exterior columns. Design curves are presented for both types of stiffening so that the method can be applied easily by the designer. Comparisons of specific examples with results obtained by a more exact computer-oriented method show that the method gives reliable results.