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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 23 Abstracts search results
Document:
SP157
Date:
October 1, 1995
Author(s):
Editors: Nigel Priestly, Michael P. Collins, and Frieder Seible
Publication:
Symposium Papers
Volume:
157
Abstract:
A total of 21 technical papers comprise this Special Publication which covers recent developments in lateral force transfer in buildings. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP157
DOI:
10.14359/14197
SP157-05
O. Joh, Y. Goto, and T. Shibata
Based on the authors' previous tests, failure modes of beam bar anchorage with 90-degree bend used in reinforced concrete beam-column joints were classified into three types: a side split failure, a local compression failure, and a raking-out failure. To clarify the raking-out failure, the least understood of the modes, column type specimens with beam bars with 90-degree bend in the beam-column joints were tested under pullout loading at the bars. The specimen variables were development length, column depth, lateral reinforcement ratio, spacing between beam bars, and concrete compressive strength. From the test results, influence factors on the raking-out failure mode were discussed and an equation evaluating anchorage strength proposed.
10.14359/981
SP157-07
R. C. Fenwick and B. J. Davidson
To survive a major earthquake, current practice requires seismic resistant frames to be designed to be ductile. To achieve the required level of ductility in multistory frames, the majority of the potential plastic hinge zones are located in the beams. The inelastic rotation, which may develop in these zones, arises predominately from the tensile yielding of the reinforcement. The associated compressive strains are small and, as a consequence, elongation occurs. Test results show that elongation on the order of two to four percent of the member depth develop in plastic hinge zones of beams subjected to cyclic loading before strength degradation occurs. The factors influencing elongation are reviewed in this paper. The results of a time history analysis, in which elongation effects are modeled, shows that this action, which is neglected in current design practice, has important implications for the detailing of columns and the design of supports for precast components and external cladding.
10.14359/982
SP157-11
M. J. N. Priestley
Current practice in seismic analysis and design is examined in this paper, with particular reference to reinforced concrete structures. The attitude of the paper is deliberately iconoclastic, tilting at targets it is hoped will not be seen as windmills. It is suggested that current emphasis on strength-based design and ductility leads in directions that are not always rational. A pure displacement-based design approach is advanced as a viable alternative. Improvements resulting from increased sophistication of analyses are seen to be largely illusory. Energy absorption is shown to be a mixed blessing. Finally, accepted practices for flexural design, shear design, and development of reinforcement and the philosophic basis of capacity design are questioned.
10.14359/983
SP157-15
W. G. Corley
Two hypothetical reinforced concrete buildings (one with special moment resisting frames and the other with structural walls) were designed. Using a time-history inelastic behavior approach, both buildings were analyzed. Drifts were determined for these structures when subjected to severe earthquakes similar to those expected in North America. In addition, drifts associated with an analysis based on ground motions measured for the 1985 Mexico City earthquake were also determined. Measured drifts from components detailed under 1990's North American code requirements are compared with calculated building drifts. These comparisons indicate that the 1990 code requirements provide significantly more capacity than calculated to be needed for the structures and components considered. Finally, minimum drift requirements for components to be used in ductile frame buildings and in shearwall buildings are suggested.
10.14359/984
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