CADEcomp provides a variety of methods of applying loads to members. The most efficient method though, is via the concept of load lists or Groups. In addition, a variety of powerful load case types are provided to handle complex combinations of loads that are often required to give optimal solutions.

 

The basic premise, is that loads, in general, are expressed in terms of a force per unit area. (eg kPa). To do this CADEcomp enables sets of loads to be applied either simultaneously and/or concurrently. These are referred to as Load 'groups'

 

By definition a load list or group is made up of a set of loads, expressed in terms of UDL (uniformly distributed load) and has the units kPa.

 

For example, if we consider the loads that would normally be applied to a roof member which supports a cladding material, and several other shorter term loads such as live, wind down and wind up we can develop a list of base cases (BC) which might look like this :-

 

         .

BC1 (Base Case 1)

BC2 (Base Case 2)

BC3 (Base Case 3)

BC4 (Base Case 4)

Dead Load (kPa)

Live Load (kPa)

Wind Load Down (kPa)

Wind Load Up (kPa)

.52

.25

.34

-1.1

 

 

where        BC1 =        0.52 is the Dead or permanent load

 BC2 =        0.25 is the Live of temporary/erection/maintenance load

 BC3 =        0.34 is a wind action load (down)

 BC4 =        -1.1  is a wind action load (up)

 

 

NOTE:

CADEcomp provides (optionally) for 2 additional load groups per member which are unique to that member (UDL1 & UDL2)  AND when using CADEload load groups are defined by user created labels such as RL1 (roof load 1), FL1, WL1  etc.

 

Defining loads in terms of kPa has several major advantages.

 

1.There is no need to manually compute the load/unit length or load/area when applied to beams or columns.

2.Used in conjunction with CADEload, there is only one source of loads descriptors for all member types loaded using the load labels

3.Changes to material types (eg sheet to tile roof cladding) can be made to the load group knowing that it will be applied to all members using that group label.

4.Complex load patterns can be created using multiple groups.

5.Load combinations are computed automatically when the Load combination option 'A' is used. ( A = Compute all combinations)

 

To allow this concept to 'work' it is assumed that BC1 is ALWAYS a dead or permanent load, and all other cases (2 thru to 15) are temporary/live loads. By setting this 'rule' we can always determine and apply appropriate combination factors with confidence. AS and adjuct to this premise, is that any combination case can be tagged or nominated as being a Dead or permanent loading. (Refer to the section Load Combinations for more information on doing this)

 

CADEcomp allows up to 50 base cases to be assigned, and up to 15 combination cases.

 

CADEcomp also has some 'special' load types that provide for complex load patterns not readily obtained using other software.

 

These load case types include

 

'M'  -  Multiple loads are applied to a member, but analysed and designed as separate instances

 'D'  -  Dynamic loads - Load groups the 'move' along a member

 'S'  -  Static loads, applied at different locations, but analysed and designed as separate instances