200 APPLIED MECHANICS 
14. A Bollman truss is shown in Fig. 275. The vertical struts divide the 
span into six equal parts. The truss carries a uniformly distributed load of 
1 ton per foot run, and 
a.single load of 10'tons eS SO = --- 
at 20 feet from the left- 
hand support. Find the 
forces, in tons, in the 10 
various members. Note 
that the sloping mem- L Se ves fangs 
bers have joints at their J K L M N 
ends only. The top Fia. 275. 
member is really a ! 
beam, but in working this problem the beam may be assumed to have pin joints 
at the junctions with the vertical struts. - 
15. Show that for a Bollman truss, if »=number of equal panels in the truss, 
d=depth of the truss, 7=span, and w=intensity of the uniformly distributed 
load, then the horizontal stress in the top member is aang”? - 1). [U.L.] 
._ 16. A Fink truss is shown in Fig. 276. The vertical struts divide the span into 
eight equal parts. There is a load of 8 tons atthe top of each vertical strut. Find 
Fiq. 276. 
the forces, in tons, in the various members. Note that the sloping members have 
joints at their ends only. The top member is really a beam, but in working this 
problem the beam may be assumed to have pin joints at the junctions with the 
vertical struts, 
