1、 The practical design method is to splice and connect according to the strength conditions such as the net cross-sectional area of the connected flange. In addition to calculating the shear force acting on the splicing position, the web connection should be determined according to the shear force obtained by 1 / 2 of the net cross-sectional area of the web or the sum of the bending moments at both ends of the member divided by the clear span length of the member.

2、 The precise calculation design method is that the flange and web of the connected member share the bending moment of the section according to their inertia moment proportion, while the shear force is all borne by the web.

3、 The commonly used simplified design method is based on the fact that the flange bears all the bending moments and the web bears all the shear forces.

4、 The equal strength design method is based on the condition of equal strength of the net section area of the flange or web to be connected.In addition to clear stress, reducing stress concentration and easy processing and installation, the most important principle of seismic joint design is to meet the principle of strong connection and weak component, so as to avoid the overall damage of the structure due to weak connection.The purpose of equal strength connection design method is to make the bearing capacity of component connection equal to or higher than that of component.Therefore, the design method of equal strength connection is often used in the structural design according to seismic design or elastic-plastic design, in order to ensure the continuity and good ductility of components.