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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 46 Abstracts search results
Document:
SP149-11
Date:
October 1, 1994
Author(s):
D. Galeota, M. M. Giammetteo, and R. Marino
Publication:
Symposium Papers
Volume:
149
Abstract:
Results of an experimental study on the structural behavior of exterior beam-column joints made of high-strength concrete and subjected to large reversal loads are presented. Variables examined were the joint shear stress and the ratio of transverse reinforcement. Based on the experimental results, it was shown that properly designed and detailed high-strength reinforced beam-column joints display ductile hysteretic behavior.
DOI:
10.14359/4159
SP149-12
H. Manalip, M. Pinglot, and M. Lorrain
Although high-strength concrete (HSC) has a brittle behavior in the case of specimens subjected to axial compression, a quite different behavior is obtained in the case of reinforced or prestressed concrete members subjected to bending. In this paper, five tests of HSC beams subjected to pure bending are described and analyzed to quantify their ductility and to deduce the real strain-softening behavior of their compressed zones. Three cases are studied: reinforced concrete, prestressed concrete, and partially prestressed concrete. The comparison of the experimental ultimate deformations (such as plastic rotations, curvatures, deflections) with the calculated values show that the strain-softening of compressed concrete may occur after the peak stress and can be defined by a k' coefficient varying from 0 to 1. For the tested beams, it was found that the use of HSC instead of normal strength concrete (NSC) results in the doubling of the plastic rotation capacity, for reinforced or prestressed beams subjected to pure bending.
10.14359/4162
SP149-13
M. Imama Vamdewalle, and F. Mortelmans
Sixteen very high strength concrete beams (3600 x 350 x 200 mm) with and without steel fibers were tested under different combinations of shear force and bending moment. The beams were singly reinforced and without shear (web) reinforcement. The cylinder compressive strength of concrete was about 110 MPa. The main variables in this program were: shear span/depth ratio (a/d), the steel fiber content (V f), and the percentage of the longitudinal flexural reinforcement ({rho}). The test results showed that, adding steel fibers to high-strength concrete increased the ultimate shear strength, increased the stiffness, reduced the deflection, and transformed the failure mode into a more ductile one. Based on the test results, two empirical expressions have been proposed to predict the shear strength of steel fiber high-strength concrete.
10.14359/4164
SP149-21
N. A. Lloyd and B. V. Rangan
Presents the results obtained from tests on high-performance concrete columns. Twenty-four columns were tested. The test parameters included shape and size of cross section, longitudinal reinforcement ratio, load eccentricity, and concrete compressive strength. Analytical methods to predict the behavior and strength of columns are also presented. Good correlation between test and analytical results is found.
10.14359/4167
SP149-22
H. Tanaka, Y. Sato, R. Park, and N. Kani
In recent years, moment-resisting frames built using high-strength concrete have been used for high-rise buildings, primarily for economic reasons. When such high-rise buildings are subjected to severe earthquakes, cyclic horizontal and axial loading can be imposed on the exterior columns. The ductile behavior of such columns needs to be insured. In this study, improvement of the flexural ductility of high-strength concrete columns under high axial compressive load is attempted by arranging longitudinal bars with mixed steel grades. The basic concept of this method is to achieve the gradual attainment of yield of longitudinal bars, from low- to high-strength steel, as the column deflection increases, and thus to delay the column reaching the maximum moment capacity until the column deflection attains the required level. To verify the adequacy of the preceding design concept, six cantilever columns with 400-mm-square cross section have been constructed and tested under simulated severe seismic lateral loading with axial compressive load of either 0.3 f' c or 0.6 f' cA g. The compressive strength of concrete f' c was 65.7 MPa on average, and steels with yield strengths of 442 and 1033 MPa were used for longitudinal reinforcing bars. The adequacy of the preceding design concept was verified from the test results, and it was found that the New Zealand concrete design code could provide a good guideline for its application to design.
10.14359/4169
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