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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 91 Abstracts search results
Document:
SP128-59
Date:
November 1, 1991
Author(s):
H. Watanabe, S. Kobayashi, H. Kawano, and K. Morihama
Publication:
Symposium Papers
Volume:
128
Abstract:
Reports on a nearly completed study begun in 1989 to improve the ductility of reinforced concrete members by mixing fibers with concrete. In this study, the bending test of fiber-mixed reinforced concrete beams made with two kinds of steel fiber and aramid fiber by reversal static loading has been done. From the test results obtained so far, it is shown that the ductility of fiber-mixed reinforced concrete beams is improved over that of normal reinforced concrete beams. It is calculated that the ductility factor of fiber-mixed reinforced concrete beams can be computed if the tensile strength and ultimate compressive strain are known.
DOI:
10.14359/3251
SP128-53
Zhoa Guofan, Huang Crengkui, and Wang Ruimin
Steel fiber reinforced concrete has been widely used in civil engineering. To promote further application of SFRC, there is a need to unify the design methods and construction techniques. Since 1988, an editorial committee for compiling a code for design and construction of steel fiber reinforced concrete structures has begun to work towards this purpose in China. Based on the results of extensive research activities and the experiences of practical application of SFRC, the draft of this code has been finished recently. The main contents of this code includes the requirements for the materials, basic design principles, ultimate limit state design, checking of the serviceability limit state, construction of SFRC, detailing of the SFRC structures with steel reinforcement, rules for design and construction of special structures, and design and construction for shotcrete SFRC. This paper will briefly introduce the main content of this code.
10.14359/3258
SP128-56
R. Iwaki, Y. Murayama, H. Akiyama, and R. Amano
Although prestressed concrete beams reinforced with fiber reinforced plastic (FRP) rods have a high potential of applicability to structures in corrosive or electromagnetic circumstances, most prestressed concrete beams showed brittle flexural failure in past experiments due to elastic rupture of the FRP used. From the viewpoint of the maintenance and hazard anticipation of structures, the brittle failure mode is undesirable. To improve the ductility, a series of flexural tests were carried out on beams with bonded and unbonded tendons, or with additional nontensioned tendons. Test results showed that the ultimate deformation in the beam with unbonded tendons was 250 percent that of the beam with bonded tendons, while the loading capacity was 90 percent, and additional placement of nontensioned tendons allowed a 400 percent larger deformation at ultimate load. Appropriate combinations of bonded and unbonded tendons with different amounts of tensioning force will satisfy the required ductility for each structure that is designed with each design concept.
10.14359/3263
SP128-57
F. Watanabe and K. Ohsumi
A new method to enhance the moment-curvature relations of reinforced concrete sections in post-yield range of deformation was developed. The point of the idea is to introduce the sequential yielding of different grade longitudinal bars in a section with the progress of section curvature. The section then does not have any negative stiffness up to the yielding of highest grade bars and results in very ductile behavior. To confirm the advantages of the new method, flexural analyses and loading tests were carried out on reinforced concrete columns with different grade longitudinal bars. The results of theoretical calculations and loading tests indicated that the combined use of different grade longitudinal bars can considerably improve the flexural behavior of reinforced concrete sections.
10.14359/3269
SP128-79
Steven G. Provenghi and Gregg E. Brandow
This is an actual case-study of a four-story reinforced concrete parking structure with ultra-thin, two-way flat slabs with drop panels. The slabs were 4.50 in. thick on bays as large as 27 x 27 ft with midspan deflections as much as 5.50 in. The evaluation included physical inspections to evaluate crack patterns as well as nondestructive tests to locate reinforcing steel and full-scale load tests per ACI recommendations to evaluate the strength of the structural slab. Recommendations for repair and strengthening were accomplished by a combination of external post-tensioning with king-post type trussing below the floor slabs and with a gravity-fed polymer repair of the structural cracks found within the slab.
10.14359/3272
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