Key points for calculation in steel structural components or connections

When calculating structural components or connections, the specified strength design value should be multiplied by the corresponding reduction factor.

1. Single-sided connected single angle steel:

1) Calculate the strength based on axial force and multiply the connection by a factor of 0.85;

2) Calculate stability based on axial compression:

The coefficient for equal-leg angle steel is 0.6 + 0.0015λ, but not greater than 1.0;

The unequal-leg angle steel with short sides connected together is multiplied by a coefficient of 0.5 + 0.0025λ, but not greater than 1.0;

Unequal-leg angle steel with long sides connected together is multiplied by a factor of 0.70;

λ represents the slenderness ratio. For single-angle steel compression bars without intermediate connections, the calculation should be based on the minimum radius of gyration. When λ < 20, λ is taken as 20;

2. For single-sided welding butt joints without backing plates, multiply by a factor of 0.85;

For high-altitude installation welds and rivet connections with poor construction conditions, multiply by a factor of 0.90;

4. The connection of countersunk head and semi-countersunk head rivets shall be multiplied by a coefficient of 0.80

Note: When multiple conditions coexist, their reduction factors should be multiplied together.