entrance sign pratt 02

A truss structure is used to hang signs at an entrance to a stadium. The locations of the centers of gravity of the signs are given by dimensions c and d. Find the forces carried in the members indicated in the table below. Dimensions and weights are given below. Neglect self-weight of the truss.

a	b	c	d	Left Sign Weight	Right Sign Weight
11 in	27 in	5.13 ft	5.625 ft	78 lb	110 lb

Reactions:

$R_A$
$R_L$

Members:
(Denote tension forces with positive values; compressive forces with negative values.)

Member	Force
$EG$
$EQ$
$QR$
$GQ$
$GH$
$HQ$
$PQ$

be sure to include units with your answers