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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 20 Abstracts search results
Document:
SP123-01
Date:
January 1, 1991
Author(s):
PC. Cheung, T Paulay, and R. Park
Publication:
Symposium Papers
Volume:
123
Abstract:
As part of a United States/New Zealand/Japan/China collaborative research project, interior and exterior beam-column joint subassemblages with floor slabs of prototype two-way and one-way reinforced concrete building frames were designed for earthquake resistance using the current New Zealand concrete design code, NZS 3101:1982. Three full-scale subassemblages as designed were constructed and tested under quasi-static cyclic loading which simulated severe earthquake actions. The overall performance of each subassemblage during the tests was satisfactory in terms of strength and ductility. The joint core and column remained essentially undamaged while plastic hinges formed in the beams. The strong column-weak beam behaviour sought in the design, desirable in tall ductile frames designed for earthquake resistance, was therefore achieved. Although the joint cores of the subassemblages remained in the elastic range, joint core shear deformations contributed significantly to the interstorey drifts. Also, a significant proportion of the slab bars in tension contributed to the negative moment flexural strength of the beams. The performance of the one-way joint was superior to the performance of the two way joints.
DOI:
10.14359/10258
SP123
Editor: James O. Jirsa
SP123 This volume is a collection of technical papers on the aspects of design of beam-column joints for seismic resistance. Nineteen papers are divided into the following groups. - Tests conducted on specimens designed using current codes but with the same general geometry and a specified loading history. (4 papers) - Design recommendations -- Japan. (1 paper) - Influence of joint geometry on strength and deformation characteristics. (8 papers) - Influence of bond on joint performance. (4 papers) - Joint in precast systems and with high-strength materials. (2 papers)
10.14359/14219
SP123-04
K. Kazuhiro, O. Shunsuke, and A. Hiroyuki
Summarizes a series of research efforts at the University of Tokyo leading to the development of earthquake-resistant design criteria for reinforced concrete interior beam-column joints. The design criteria emphasize the protection of the joint to an acceptable deformation level of a frame structure during an intense earthquake. For the design against shear, shear-resisting mechanisms by truss and concrete compression strut, the role of joint lateral reinforcement, and the effect of transverse beams and slabs were studied experimentally. The requirement for beam bar bond was discussed on the basis of nonlinear earthquake response analysis.
10.14359/2822
SP123-05
Shunsuke Otani
The Architectural Institute of Japan (AIJ) published its 1988 draft design guidelines for earthquake-resistant reinforced concrete buildings based on ultimate strength concept as a first attempt to develop an ultimate strength design procedure in Japan. This paper introduces the general concept of the design procedure, and explains in detail the design requirements and background information for reinforced concrete beam-column joints of the AIJ guidelines. Based on experimental evidence, the amount of lateral reinforcement in the joint required is significantly reduced from ACI requirements.
10.14359/2829
SP123-06
S. Fujii and S. Morita
Eight 1/3 scale specimens, consisting of four pairs of interior and exterior beam-column subassemblages in one-way frames, were tested. To investigate the basic joint shear strength, the test program was so determined that joint shear failure occurred in most specimens prior to beam yielding by using high-strength steel for beam bars. Test variables were beam bar strength, column axial load, and amount of joint hoop. The test results showed: 1) the increase of column axial load level from f'c / 12 to f'c / 4 did not influence the ultimate shear strength of the interior joints, but this increase in column axial load improved the shear strength of the exterior joints nearly 10 percent; 2) the ultimate shear strength represented in terms of nominal shear stress was f'c / 4 for interior joints; 3) when the shear strength of the exterior joints was evaluated on the basis of projected length of hooked beam bars instead of total column depth, nearly the same strength was obtained for both types of joint; 4) the increase of joint shear reinforcement ratio from 0.41 to 1.1 percent did not noticeably effect the behavior for both types of joint; 5) once joint shear strain reached to 0.5 percent degradation of shear rigidity was accelerated under subsequent load reversals.
10.14359/2836
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