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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 25 Abstracts search results
Document:
SP63-18
Date:
August 1, 1980
Author(s):
S. A. Freeman, R. M. Czarnecki, and K. K. Honda
Publication:
Symposium Papers
Volume:
63
Abstract:
The lateral force stiffness characteristics of structures cannot be represented by a single set of modeling assumptions. Measured data obtained from the study of full-sized buildings subjected to various sources of lateral displacements are compared to calculated results based on various modeling assumptions used in determining the stiffness characteristics of structures. Tentative recommendations are presented for use in the lateral force design of reinforced concrete buildings subjected to winds and/or earthquakes. Stiffness properties associated with effective concrete sections, concrete slab participation, and nonstructural materials are discussed. For both wind and earthquake design, it appears that the assumptions that apply to low amplitude motion should be different than the assumptions that apply to high amplitude motion. Therefore, it is recommended that modeling techniques and the cal-culation of stiffness characteristics be based on some form of a two-level approach.
DOI:
10.14359/6661
SP63-19
Lawrence G. Selna and Wai K. Tso
A five story reinforced concrete building which collapsed during the Mindanao, Philippines Earthquake of August 1976 is studied. The building experienced a twisting motion dur-ing its collapse. The damages to the building are described, and design calculations which consider the twisting are performed. The calculation results show that a number of columns were understrength but that other factors such as reinforcement detailing and material quality influenced the seismic performance of the building.
10.14359/6662
SP63-20
J. Schwaighofer and W. N. Ho
The equivalent frame method is employed in the elasto-plastic analysis of a perforated core structure which is subjected to uniformly distributed torque over the height of the core. In a step by step approach the sequence of crack formation, and the onset of yielding of the tension steel in the coupling elements and the shear walls is given.
10.14359/6663
SP63-21
B. Stafford Smith and I. 0. Nwaka
A study is made of the forces and displacements in multi-outrigger tall building structures. Simplified general equations are developed for the restraining moment of the out-riggers, the reduction in drift and the optimum location of the outriggers for maximum drift reduction. The efficiencies of various optimum and evenly spaced outrigger systems are presented. The assumptions used make the method of analysis suitable only for preliminary design guidance; however, some valuable general conclusions relating to the number and location of outriggers are drawn.
10.14359/6664
SP63-22
Y. C. Wong and A. Coull
An influence coefficient method is presented for the analysis of the interaction between laterally loaded walls, of different cross-sectional shapes, and their connecting floor slabs. The results have been tested for both convergence and accuracy against those obtained by the finite element and finite difference technique. The method yields accurate results for both slab stiffness and stresses, with a considerable saving in computer time over the other theoretical analyses.
10.14359/6665
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