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Concrete In Australia : September 2013
Concrete in Australia Vol 39 No 3 63 L, N, and E and their individual properties are defined within AS 46712. e ductility of reinforcing steel varies and is dependent upon the steel manufacturing and finishing processes; further information on this subject can be provided by SRIA3 (Steel Reinforcing Institute of Australia) or ACRS4 (Australian Certification Authority for Reinforcing Steel). e ductility of the reinforcement is established by the value Agt, which is defined as the percentage total elongation at maximum force (see Figure 3). is is the increase in gauge length of the test piece at maximum force (Rm), expressed as a percentage of the original gauge length. A minimum ratio Rm/Re between tensile failure and yield stress is also specified. ISO 15835 adopts a minimum Agt value, measured in the reinforcing bar outside the splice, of no less than 0.7 x the specified characteristic Agt value of the reinforcing bar. e reduced Agt value for a splice connection is realistic due to the geometry, stiffness and mechanism of load transfer; a splice will behave differently from a control bar which simply strains under tensile load. A spliced connection is subject to movement comprising of two elements, elastic strain plus slip, the latter element being due to the fit between the coupler and rebar. Due to this load transfer mechanism the coupler Agt value will in general be less than the straight control bar. 6.0 CYCLIC [SEISMIC] PERFORMANCE e performance of mechanical splices under cyclic loading is critical in seismic regions. e requirements for seismic behaviour differ greatly between Australia and New Zealand, but again, ISO 15835 provides test requirements and guidance Figure 1. Permanent set load cycle. Figure 2. Permanent set measurement. Figure 3. Ductility Agt.