3.4 Trusses with Subdivided Panels 55
an immediate application of the joints and through section methods might lead to
some difficulties.
Incorrect!67Correcta
123
45
k nnab1256
b3 4 7
cabc(^21)
3
1
1
d
1
(^67)
5
4
3
2
8
1
3
2
4
7
6
5
8
Fig. 3.15 Trusses with subdivided panels with their main and secondary trusses. Note:Shaded
zonein (a)and(b) are discussed in the kinematical analysis
3.4.1 Main and Auxiliary Trusses and Load Path.................
Analysis of trusses with subdivided panels can be performed in an orderly fashion
using the concepts of themainandsecondary(auxiliary) trusses. The main truss is
a simple truss, which is enhanced by additional members. The secondary truss is a
conventionaltruss, which contains additional real members (3-kandk-nfor truss
in Fig.3.15a) and some imaginary members. These imaginary members coincide
with members of the main truss. The secondary trusses are shown by dotted lines.
The concepts of the main and secondary trusses allow us to consider trusses with
subdivided panels as compound trusses. Combinations of two trusses – a main and
sets of secondary trusses are shown in Fig.3.15. In all cases, the secondary trusses
are supported by the joints of the main truss.