According to the code, the limit va

According to the code, the limit value of the axial compression ratio is 0.75. As can be seen from the table above, the calculated axial compression ratio of each layer is less than the limit value, which meets the requirements.9.3.1 calculation of normal section of frame columnAccording to the second chapter, the grade of column concrete is C30(fc=14.3kN/m, ft=1.43kN/m). The column longitudinal reinforcement and stirrup are HRB400(fy=360kN/m) and HRB400(fyv=360kN/m), respectively.It can be found from the combination of internal forces: there are three groups of controlling internal forces for the frame column, as shown below