Steel Project 2Objectives The objectives of this project are to provide the student with e...

Steel Project 2

Objectives The objectives of this project are to provide the student with experience in the methodology involved in determination of tributary loads of structural members, in development of free-body diagrams, and in selection of steel beams, columns, and joists based on gravity loading.

Design parameters The roof framing plan of a simple building structure is shown. The floor is a floating concrete slab that is isolated from the structure. The floor-to-roof distance is 16 ft. The columns rest on foundation pedestals. The specified compressive strength of the concrete foundation pedestals is 3000 lb/in2. The roof loads of this structure are to be based on the following:

Rooftop HVAC units apply a 4-kip load at the center of the two girders. Assume that this load is carried by these two girders only.

Analysis Girders. Girders are to be wide-flange sections. ASTM A36 steel (Fy = 36 000 lb/in2, E = 29 000 000 lb/in2) is specified for all structural steel. Section investigation is to include constructing a free-body diagram of the beam, flexure analysis, web shear analysis, and deflection analysis where possible with the ∆max equations provided in this book (otherwise, deflection should be neglected). The lightest acceptable wide-flange structural member is to be specified.

Columns. Column-section investigation is to be based on tabular selection from AISC column tables with an effective length based on K= 1,0, backed up with longhand analysis. The lightest acceptable W14 steel section is to be specified. Analysis of column base plates is also required.

Joists. Joist-section investigation is to be based on tabular selection. Analysis is to be based on use of K-series steel joists at 4 ft spacing. Analysis of bridging is also required.

The following load combinations of dead loads (Dload), live floor loads (Lload), roof loads (Lroofload), snow loads (Sload), rain/ice load (Rload), wind load (Wload), and earthquake load (Eload) are to be used to determine the design load. Earthquake and wind loads are to be neglected.