BS DD133(1986) : 1986

Foreword
Committees responsible
Code of practice
1. Scope
2. Definitions
3. Axes of members
4. Main symbols
5. Structural configurations and buckling length
5.1 General
5.2 Leg members
5.3 Bracing patterns
6. Calculation of ultimate member stress
6.1 General
6.2 Calculation of reference stress
6.3 Calculation of slenderness parameter
6.4 Ultimate member stress
6.5 Selection of buckling curves for angles
6.6 Compound members as bracing
6.7 Selection of buckling curve for tubular members
7. Secondary members
8. Calculation of ultimate strength of member in
     tension
9. Bolted connections
9.1 Angle bolted connections
9.2 Tubular bolted connections
Appendices
A. Calculation of N
B. Typical values of sigma u
Tables
1. Effective length factor, k for horizontal of K
     brace (without plan bracing)
2. Applied force as percentage of leg load, F
3. Values of N
4. Typical values of sigma u for steel of 355 N/mm
     squared yield and B/T < 13.79
5. Typical values of sigma u for steel of 355 N/mm
     squared yield and B/T = 15
6. Typical values of sigma u for steel of 255 N/mm
     squared yield and B/T < 16.27
Figures
1. Axes of members
2. Symmetrical and staggered bracing to legs
3. Cruciform angle sections
4. Types of lattice bracing
5. Typical plan bracing
6. K bracing horizontals without plan bracing
7. Cranked K bracing
8. Portal frame
9. Location of bolts
10. Strut curves 1, 3 and 4
11. Strut curves 2, 5 and 6

Describes a basis for assessing the strength of members and connections for towers of lattice construction consisting of bolted, riveted or welded steel angle or tubular sections. The recommendations supplied are valid for both equal and unequal angles, either rolled or cold formed, compound members fabricated from these sections and tubular members.