Strength and Drift Characteristics of Steel Frames

by Le-Wu Lu, (M.ASCE), Prof. of Civ. Engrg.; Building Systems Div., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
Shosuke Morino, Asst. Prof.; Dept. of Architecture, Kyushu Univ., Kyushu, Japan; formerly, Research Assoc., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
Omer S. Okten, Grad. Student; Faculty of Architecture, Istanbul Technical Univ., Istanbul, Turkey; formerly, Research Asst., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
J. Hartley Daniels, (M.ASCE), Prof. of Civ. Engrg.; Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,
Erkan Ozer, Assoc. Prof. of Civ. Engrg.; Istanbul Technical Univ., Istanbul, Turkey; formerly, Research Assoc., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.,


Serial Information: Journal of the Structural Division, 1977, Vol. 103, Issue 11, Pg. 2225-2241


Document Type: Journal Paper

Abstract: The strength and drift characteristics of unbraced multistory steel frames subjected to combined loads are studied with emphasis on P-Δ effect. Seven frames having dimensions and loads typical of those found in apartment and office structures were selected. Four designs are made for each frame: three stress-controlled designs and one drift controlled design. The frames are then analyzed for their response under proportioned and nonproportioned loads. Results show that even though the strength of the structures is reduced by P-Δ effect, all stress designs can achieve a wind load factor equal to or greater than 1.40 under proportional loads, 2.06 under nonproportional loads with gravity load maintained at working value. The stress design having columns proportioned to satisfy AISC provisions does not show significant increase in strength when compared with the design neglecting instability effect. The drift designs have large wind load-carrying capacity, ranging from 1.45 to 4.0, depending on the amount of gravity load.

Subject Headings: Gravity loads | Wind loads | Structural strength | Drift (structural) | Steel frames | Load factors | Load bearing capacity

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