Study on coefficient Bi in N value calculation method about column's top and bottom joints: Proposal of the calculation method about the tensile of column's top and bottom joints considered the flexural rigidity of the beams and the axial rigidity of the joints, and analytical examination about coefficient Bi

According to the moment resistance frame substitution model, the assumed stress state about the N value calculation method to estimate the required tensile force of column's top and bottom joints was explained. The general solution about the tensile force of column's top and bottom joints was derived with the moment resistance frame substitution model and the shear panel substitution model in which the bending stiffness of the beams and the axial stiffness of the joints were considered. It was found by using the general solution with these substitution models that the coefficient "Bi", which is multiplied by the shear wall magnification factor in N value calculation method, was affected by the bending stiffness of the beams and the shear wall length. As a result, the validity and coverage of the coefficient "Bi" became clear. In addition, the approximated values of "Bi" corresponding to each shear wall length were shown in Table 3 for the practical structural calculation as the result of this theoretical study. The tensile force of column's top and bottom joints in various conditions can be obtained accurately by the calculation method of this theoretical study.