Showing papers on "Shear wall published in 1973"

Approximate analysis of tall wall-frame structures.

Abstract: A relatively simple hand method is presented for the static and dynamic analyses of uniform structures consisting of interacting shear walls and frames with effectively planar loadings and deformation. The method is applicable also to the static analyses of non-uniform shear wall-frame structures in which step changes of properties occur at several elevations in the height of the structure. Examples are given to show that the method provides results which compare closely with those obtained from more exact but lengthier methods of analysis. Design curves which further simplify the hand computation are also included.

Dynamic structure-soil-structure interaction

Abstract: A study is made of the dynamic interaction, through the soil, between two parallel infinite shear walls placed on rigid foundations. The steady-state response of both structures for a vertically incident SH wave is obtained and compared with the corresponding values resulting from consideration of only one structure. It is found that the additional interaction effects caused by the presence of a second structure are especially important at low frequencies and in the neighborhood of the fixed-base natural frequencies of the second structure. For high frequencies it is sufficient to consider the interaction between each structure and the soil, ignoring the presence of other structures.

Friction--frequency dependence for oscillatory flows in circular pipe

Abstract: Measured data of velocity changes in oscillatory flows (0.16Hz-0.36Hz) are presented. The actual wall shear stresses obtained from the measurements are compared to calculated values based on steady flow relations and Zielke's model. A new model for the prediction of the wall shear stress as function of velocity and acceleration changes is introduced. The proposed model may be a suitable basis for the prediction of friction data for one-dimensional flow analysis under nonsteady conditions.

Approximate Analysis of Open-Section Shear Walls Subject to Torsional Loading

Abstract: A hand method of analysis is presented for the torsional warping behavior of nonplanar asymmetrical systems of shear walls such as the elevator and service shafts in tall buildings. The method is suitable for both uniform and nonuniform walls with or without constraining lintels, or internal floor slabs, or both. The basic governing equations are derived, and used to construct non-dimensional curves which allow the direct analysis of uniform open-section walls subject to uniformly distributed torsional moment. The transfer matrix method is used to extend the method for the hand analysis of nonuniform wall systems. The results for uniform and nonuniform examples are shown to compare closely with those obtained by a more exact computer analysis.

Elasto-Plastic Analysis of Coupled Shear Walls

Abstract: An elasto-plastic procedure for analysis of coupled shear walls by assuming a partial or complete collapse mechanism is presented. The complete collapse mechanism is assumed to occur when plastic hinges are formed at the supports of the coupling beams over the whole height of the wall and at the base of the walls, while the rotational ductility factory at coupling beam support has not yet been reached. The partial collapse mechanism is assumed to occur when the rotational ductility factor is reached before plastification of coupling beam ends has extended over the whole height. For solution, the continuum approach for analysis of coupled shear walls was applied. For practical applications, charts are presented for evaluation of various design parameters as functions of structure parameter by assuming an upper triangle load pattern, frequently used to simulate dynamic effects of earthquake motions.

General Analysis of Nonplanar Coupled Shear Walls

Abstract: A theory to analyze nonplanar coupled shear walls subjected to lateral loading is presented. The theory is applicable to a pair of shear walls of arbitrary cross-sectional shapes connected by a band of evenly spaced connecting members. The lateral loadings can be completely general and are not restricted to act in certain planes. The theory gives the torsional deformation in addition to the flexural deformations of the structure. A test on a Plexiglas structural modal is carried out to verify the accuracy of the theory.

Three-Dimensional Interaction of Walls and Frames

Abstract: The three-dimensional interaction of several plane walls, open section walls, and plane frames is studied under the action of horizontal forces. Walls are taken to have infinite shear rigidity while warping effects are considered. Frames are treated as vertical cantilever beams with infinite bending moment rigidities but finite shear stiffnesses. The floor slabs are replaced by an infinite number of diaphragms with no transverse stiffness but infinite in-plane rigidity. The stiffnesses of the walls and frames are assumed constant throughout the height of the building. A system of three differential equations of the third order solves the problem in a way similar to the displacement method. The method is useful in providing a general view of the macroscopic behavior of the structure through the use of a small number of elastic parameters.

Approximate analysis of natural vibrations of coupled shear walls

Abstract: The continuous connection technique is used to analyse the free vibrations of a system of coupled shear walls. The dynamic equation is expressed in integro-differential form, and the natural modes and frequencies are determined by the Galerkin method. Theoretical results are compared with published experimental data.