SCHOOL OF CIVIL ENGINEERING
This report describes a compression test on concrete columns. The main aim of the tests was to illustrate the ultimate strength limit state of reinforced concrete columns in combined bending and compression and to demonstrate the influence of slenderness on the ultimate load capacity. Test methods are described. It was found that the concrete columns exhibited complicated behaviour, and had a squash load point of 342.7KN and moment at 0 KN.m, a decompression point of 227.75 KN and moment at 2.92 KN.m, a balanced point (nominal) of 58.46 KN and moment at 3.81KN.m, a pure bending point of 0 KN and moment at 2.86 KN.m, a balanced point (actual) of 42.26KN and moment at 3.86KN.m.
TABLE OF CONTENTS
Test Results and calculation
3.1 experiment result
This study primarily explores the experimental study on the behaviour of concrete columns reinforced internally in combined bending and axial loads, and discusses the difference between experiment behaviour and the theoretical behaviour. First part of this study covers the experimental investigation of reinforced short column and slender column. Each type consists of two specimens with identical dimensions, geometry and reinforcing arrangement. The second part of this study is pertains to the theoretical sectional analysis of concrete columns. The interaction curves of axial force vs. moment are derived and plotted. Finally, the results of the analytical methods are compared with experimental predictions. Based on this study, the strength expressions are derived using the equilibrium, strain compatibility, and stress-strain relationship for the constituent materials in this report.
The test runs on the compression test machine.
In this test, it is required to measure the initial concrete length and diameter. The data is showed in right. Clean the bearing faces of the upper and lower bearing platen and the test specimen. Concrete sample is placed on the lower platen of a compression testing system and carefully aligned with the longitudinal axis. The machine will exert a compression force on the both side of specimen causing it to compress. The computer software controlling the machine can specify the displacement and the applied load. The computer software then steadily increased the force exerted on the sample by the machine. The specimen is compressed with increased load until the specimen breaks. The force and displacement is displayed on the computer along with the total compression.
|PARAMETER |VALUE | |Fc’ |50Mpa | |Fy |600Mpa | |R |6mm | |α |0.85 | |ϒ |0.7 | |As1 |84.8mm2 | |As2 |56.6mm2 |
Table 1: Parameters...
References: Dr Andrew Wheeler, ADVANCED DESIGNTM OF COLUMNS (accessed on 20/03/2012) http://www.reinforcing.com/asset/cms/TECHNICAL%20RESOURCES/Advanced_Design_Columns.pdf
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