Select the lightest pair of C9 channels to support the loads PD = 50 k and PL = 90 k. The member is to be 20 ft long with both ends pinned and is to be arranged as shown in the accompanying illustration. Use A36 steel and design single lacing and end tie plates, assuming that 3/4 -in diameter bolts are to be used for connections. Assume that the bolts are located 1 1/4 in from the back of channels. Solve by LRFD and
Select the lightest pair of C9 channels to support the loads PD = 50 k and PL = 90 k. The member is to be 20 ft long with both ends pinned and is to be arranged as shown in the accompanying illustration. Use A36 steel and design single lacing and end tie plates, assuming that 3/4 -in diameter bolts are to be used for connections. Assume that the bolts are located 1 1/4 in from the back of channels. Solve by LRFD and
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:Select the lightest pair of C9 channels to support the loads PD
= 50 k and PL = 90 k. The member is to be 20 ft long with both
ends pinned and is to be arranged as shown in the
accompanying illustration. Use A36 steel and design single
lacing and end tie plates, assuming that 3/4-in diameter bolts
are to be used for connections. Assume that the bolts are
located 1 1/4 in from the back of channels. Solve by LRFD and
ASD procedures.
I
6 in
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Step 1: Given data:-
VIEWStep 2: Calculate the required area using the below formula;
VIEWSolution
VIEWStep 3: Calculate the moment of inertia along y-direction;
VIEWStep 4: Now find the value of slenderness ratio by choosing the minimum value of the moment of inertia using
VIEWStep 5: Calculate the available strength for the column for LRFD design control method;
VIEWStep 6: Calculate the available strength for the column for ASD design control method;
VIEWStep 7: Design of end tie plates;
VIEWStep 8: Design of single lacing ( LRFD );
VIEWStep 9: Calculate the member length;
VIEWStep 10: The area required for lacing bar;
VIEW
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