BS 2573-1:1983

Foreword
Committees responsible
Specification
Section one. General
1.1 Scope
1.2 Definitions and applications of terms
Section two. Classification of the crane as a whole
2.1 General
2.2 Class of utilization
2.3 State of loading and nominal load spectrum factor
2.4 Determination of group classification of the crane
Section three. Loads and load combinations
3.1 Loads and load combinations to be considered in
     design
3.2 Loads due to climatic conditions and natural
     phenomena
Section four. Selection of steel, minimum thickness and
              working stresses
4.1 Selection of steel
4.2 Minimum thickness of plates and sections
4.3 Working stresses
Section five. Stresses in structural components
5.1 Individual members, rolled sections, hollow
     sections and members with plated webs: verification
     relative to the yield stress
5.2 Lattice girders and trusses: verification relative
     to the yield stress
5.3 Secondary stresses
Section six. Basic stresses in connections
6.1 Welds
6.2 Basic stresses for bolts, studs and rivets
Section seven. Proportions of structural components,
               plates and web stiffeners
7.1 Effective lengths of parts in compression
7.2 Widths of plates
7.3 Web plates and web stiffeners
Section eight. Fluctuating loads: permissible fatigue
               stresses
8.1 Detail design
8.2 Number of stress cycles
8.3 Loads and stresses to be considered
8.4 Methods
8.5 Permissible fatigue stress
8.6 Classes of constructional details
8.7 Connections: riveted or bolted
8.8 Connection: load-carrying fillet welds
Appendices
A Typical crane classifications
B The use of steels of higher tensile strengths than
     those of steels to BS 4360
C Effective lengths of crane jibs, considered as
     uniform struts
D Basic formula for calculation of Cs
E Design checks for stiffened compression flanges
F Fatigue strength
Tables
1 Class of utilization
2 State of loading
3 Group classification of the crane as a whole
4 Impact and duty factors according to crane type and
     application
5 In-service design wind pressures
6 Wind force on suspended load
7 Out-of-service design wind pressures
8 Force coefficients Cf
9 Shielding factors phi
10 Basic stresses in structural members
11 Values of Robertson constant alpha for struts of
     various sections
12 Values of Fcrip for steels to BS 4360
13 Values of K1
14 Values of K2
15 Values of A and B to be used in calculating values
     of Cs in newtons per square millimetre
16 Basic stress Pbc.bas for different values of
     critical stress Cs
17 Basic average shear stress Pq.bas in stiffened webs
     of steel to BS 4360
18 Basic stresses in welds
19 Basic stresses in rivets as a percentage of YR0.2
20 Effective lengths of parts in compression
21 Effective length with no lateral bracing
22 Maximum width of plates in compression
23 Projection of unstiffened compression flange plates
24 Permissible tensile and compressive fatigue
     stresses Pft and Pfc for various classes of
     constructional detail in steels of grades 43, 50
     and 55 to BS 4360
25 Overhead travelling industrial type cranes (O.T.C.)
26 Overhead travelling steelworks cranes
27 Transporters
28 High pedestal or portal jib cranes and derrick
     cranes
29 Tower cranes
30 Freight container cranes
31 Dimensional requirements for stiffeners
32 Value of factor K
33 Plate strength in newtons per square millimetre:
     class P
34 Plate strength in newtons per square millimetre:
     class Q
35 Column strength in newtons per square millimetre:
     alpha = 1.0
36 Column strength in newtons per square millimetre:
     alpha = 2.0
37 Column strength in newtons per square millimetre:
     alpha = 3.5
38 Column strength in newtons per square millimetre:
     alpha = 5.5
39 Effective length factor K1
Figures
1 Skew load coefficients
2 Conversion chart for wind speed and pressure
3 Definitions: aerodynamic slenderness, section
     ratio, solidity ratio and spacing ratio
4 Effective throat thickness of fillet welds
5 Effective throat thickness of deep-penetration
     fillet welds
6 Effective length with lateral bracing
7 Typical class E weld details
8 Typical class F weld details
9 Typical class F and class G weld details
10 Typical class G weld details
11 General case for determining effective length of
     jib
12 Special case where fixed pulleys for derricking and
     hoist ropes are in one vertical line
13 Special case where fixed pulleys for derricking and
     hoist ropes are vertically above jib pivot point
14 Cantilever crane jib with hoist rope parallel to
     jib axis
15 Cantilever crane jib with hoist rope not parallel
     to jib axis
16 Ratio of effective length/actual length for
     cantilever crane jibs
17 Box girder compression flange: typical construction
18 Types of stiffener
19 Factor C' for tees to BS 4 : Part 1
20 Variation of stresses in a stiffened compression
     panel
21 Plate strength curves for simple method
22 Column strength curves for simple method
23 Classification of plate elements for detailed
     method
24 Plate strength curves for detailed method
25 Factor K1 for detailed method
26 Column strength curves for detailed method

Gives a base for computing stresses in crane structures and permissible stresses for steels to BS 4360. Covers classification based on severity of intended use of load to be considered, selection of steel, minimum thickness of plates and sections, working stresses, basic stresses in joint fastenings, web plates and stiffeners and fluctuating loads. Appendices give classification, use of steels of higher tensile strength than those to BS 4360, effective lengths of jibs, basic formula, design checks, and fatigue strength of structural components.

This Part of BS2573 specifies the basis for computing stresses in crane structures and the way in which permissible stresses in crane structures shall be determined in order to secure economy in design and reliability in operation. For this purpose it specifies a classification system that enables the purchaser and the manufacturer to match a particular crane to the required duty and utilization.

NOTE The titles of the publications referred to in this standard are listed on the inside back cover.