以钢筋混凝土柱与矩形管和圆管的相互作用图为示例，采用的函数为Interaction_Diagrams。

Two example are attached for interaction diagrams of RC columns with rectangular and circular tubes using the function Interaction_Diagrams.

function Interaction_Diagrams(x,y,x_s,y_s,a_s,fc,fy,E)

Input:

x: x coordiantes of section vertix vector (mm) 

y: y coordinates of section vertix vector (mm) 

a_s: area of steel bars vector (mm^2) 

x_s: x coordinates of steel bars vector (mm) 

y_s: y coordinates of steel bars vector (mm) 

fc: compressive strength of concrete (MPa) 

fy: yield stress of steel vector (MPa) 

E: modulus of elasticity of steel vector (MPa)

Output:

Column section, failure envelope, interaction diagrams in x and y directions are plotted in one figure.

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