4.1 Initial StiffnessThe initial stiffness calculations are based on the edgezone concept [25,27,28] developed at Iowa State University andmodified herein to accommodate the plank diaphragms. Theinitial stiffness calculation is based on the assumption thatplank displacement is a resultant of four displacementa- Bending componentb- Shear component A,c- Edge zone deflection component A,d- Plank Deflection relative to the framing beam A,
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