Title page for ETD etd-04142009-040522
|Type of Document
||HagenBurger, William C.
||Feasibility of open web rafters constructed of single angles
||Master of Science
|Murray, Thomas M.
|Easterling, William Samuel
|Holzer, Siegfried M.
|Date of Defense
The purpose of the research reported here was to determine if single angles can be used for
chord and web members in lightweight steel open web rafters, and if so to determine what effect
the single angles have on the design of the rafter's members. A computer model was constructed
to determine the effects of a unsymetric cross section coupled with eccentric loadings of the
members on out-or-plane displacements, and bending moments and stresses in the chord and web
members. This computer model modeled the eccentricities and unsymetric section properties of
the single angles. A study of the effect of out-or-plane bracing on the bending moments and
stresses was also conducted. Finally various web configurations (angle web members on the same
side, alternating, and opposite) were studied to determine their effect on moments in the web and
chord members, along with their effect on out-or-plane displacements. A preliminary design
procedure for chord and web members using the new AISC ""Specification For Allowable Stress
Design of Single Angle Members" is presented. Finally suggestions on out-of-plane bracing and
connections are made.
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