How many connection design methods are there for steel structure members?

Practical design method, accurate calculation design method, common simplified design method and equal strength connection design method.

I.

the practical design method is to conduct splicing connection 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 shall also be determined according to 1 / 2 of the shear bearing capacity of the net cross-sectional area of the web or the shear force obtained by dividing the sum of bending moments at both ends of the member by the net span length of the member.

II.

The accurate calculation design method is that the flange and web of the connected member share the bending moment at the section according to the proportion of its moment of inertia, and all the shear force is borne by the web.

III.

The commonly used simplified design method is to conduct splicing design according to that the flange of the member bears all bending moments and the web bears all shear forces.

IV.

equal strength design method is to splice according to the conditions of equal strength of the net cross-sectional area of the connected flange or web.

In addition to the principle of clear stress, reducing stress concentration and facilitating processing and installation, the most important point in the design of seismic joints is to meet the principle of strong connection and weak members, 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 member connection equal to or higher than the bearing capacity of member.

Therefore, the equal strength connection design method is often used in the member splicing design of structural seismic design or elastic-plastic design to ensure the continuity and good ductility of members.

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