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Concrete In Australia : March 2013
Concrete in Australia Vol 39 No 1 27 about 75%-88% of the peak load due to the presence of the reinforcement. It was possible to measure the post-peak behaviour of samples with REO2 because all tests were performed under displacement control, ie a constant rate of displacement was applied to the anchor. If the test had been conducted by incrementing the load (load-control), the post-peak behaviour would not have been witnessed as the samples would have been unable to resist a higher load and displacement. Whilst load- control would better represent the condition of loading induced during actual lifting operations, a displacement controlled methodology was selected for these tests. Tests carried out on companion samples highlighted that specimens tested later in the day reached higher load capacities because of the considerable increase in concrete strength that had taken place during the testing period, well depicted in Table Figure 9. Layout of the crack patterns observed after the tests of samples prepared with reinforcement arrangement REO2. () (a) CA3 (c) EPA3 (e) SJH3 (f ) SJH4 (d) EPA4 (a) CA4