Question

(a) Warren truss (b) Howe truss (c) Pratt truss (d) Baltimore truss (e) Parker truss Figure 2: Truss Types (Nielson Text) The truss bridge has the following properties/characteristics: 1. Span length (bottom chord): 168 ft 2. 14 panels (12 ft length per panel) 3. All diagonals are 45 degrees 4. Simple truss (all members are pin-connected and loads are only applied at the joints) 5. Simply-supported (pin at one end, roller at the other) 6. 13 ft width between trusses (i.e. walkway between the two trusses is 13 ft wide) Assume that the bridge is subjected to two uniform area loads: or lb - Dead Load: W 45 psf lb Live Load: WL = 100 psf ( i) You will need to apply the uniform loads to the joints to analyze the truss. To do this, follow this equation P - (umiform area load) (tributafy width) (tributary length) The "tributary width" is Yá the width of the bridge (6.5', measured transverse to the bridge), and the "tributary length is the half the panel lengths on either side of the joint (6' + 6' -12, measured in longitudinal direction of bridge). The force should only be applied to the joints on the bottom chord. Note that every bottom joint will have the same magnitude of load applied, except for the joints at each end (which would have % of the load).

Answer 1

I'm guessing we are taking about a women tuss here Since it is Not clearly mentioned Just for the hints. So, there are 14 pants of length 12 facts each and the Width of each panel is 13 fect. Now since the bridge is made up of two exact similar true. The loads will be distributed equally to both the truses. hence half of the load will be considered for one truss, which Will be analyzing. From the given data: Point load at each of the two supports due to load will be given by P_0 supports - 'W_D Ib/Ft^2 times 6.5 ft times 6 ft = 39 W_D lbs And point load of each of the other bottom joints will be given by \r\n P_D points = W_a lb/ft^2 times 65 ft times 12 ft = 78 W_n Ibs Similarity point toad at each of the two supports due to lives load will be given by