The three-hinged arch truss shown in Figure 6.15a has a bottom chord of the same funicular shape as that found in Example 6.3. To demonstrate one benefit of using a funicular arch shape, 

(a) analyze the truss assuming the applied loads represent the dead load of the structure,

(b) analyze the truss with a single concentrated live load of 90 kips applied at joint L. Member KJ is detailed with a slotted connection at one end so that it cannot transmit axial force. Assume joint D acts as a hinge.

Figure 6.15a

Example 6.3

Establish the shape of the funicular arch for the set of loads acting on the trussed arch in Figure 6.14a. The rise of the arch at midspan is set at 36 ft.

Figure 6.14a

Transcribed Image Text:

H 30 kips RA 60 kips B 20 60 kips 32' 60 kips D 36' 60 kips 6 @ 30' 180'- (a) E 60 kips 30 kips H RG 48' H