SEAOSCStructural Engineering Association Of Southern California
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The Structural Engineers Association of Southern California (SEAOSC) defines a yield limit state and strength limit state determined from the hysteresis curves from the sequential phased displacement (SPD) reversed cyclic test protocol (SEAOSC 1996).
In 1997, the Structural Engineers Association of Southern California (SEAOSC 1997) adopted a standard method of cyclic load test for shear walls, which used a sequential phased displacement (SPD) test protocol.
Dinehart and Shenton (1998) also used the SEAOSC SPD procedure to compare the cyclic response of eight standard shear wall specimens with four matched ASTM E 564 (ASTM 1995) tests.
In the SPD procedure, phase increments are a function of the first major event (FME), defined as "the first significant limit state to occur" (SEAOSC 1997).