Question

Then, for the mechanical assemblies shown below, • Label each of them as a frame, truss, or machine. • Identify (by inspection) any OF., 2., 3F-members present in each assembly. (-5,5) (4,3) (3.-4) ft 4 ft 12 kip - 4ft - 4ft - -4ft -

Answer 1

Figure-1( Top Left)

all members are connected as a pin joints and there is no any traverse load. so it is identified as a TRUSS.

There is no any 0F members available in the truss.All are 1F members as all will cater only sngle force in the members as tensile or compressive.

Figure-2 (Top Rigjt)

Here by applying force at the one side of the member then there will be motion transmission happens. Which is only possible in case of mechanism.

so its a mechanism. In a mechanism there is no any 0F mbers. Other all are 2F members as they will feel bending as well as diect loading by applying the external force.

Figure -3 (Bottom Left)

Here all joints are pinned joint but there is one traverse load is acting on one of the member so it will become frame.

There is no any 0F member in the frame. Only one 2F member in the frame that is where the traverse loading in happing. remaining all are 1F member.

Figure -4 (Bottom Right)

Here one end of the structure is fixed to the support which refers to the frame.

All members are 1F members as there is no amy traverse load