THE ECONOMIC USE OF HIGH-STRENGTH STEEL IN RIGID FRAME BUILDINGS.
Rept. for Oct 64-Jan 66,
LEHIGH UNIV BETHLEHEM PA FRITZ ENGINEERING LAB
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A study was made of the economics of using steels of various yield strengths in the design of building frames. A four-story, single-bay frame has been used as an example to obtain quantitative information as to weights, strengths and costs when mixtures of steel grades are incorporated in a design. One phase of the study consisted of strength-to-cost comparisons of eight frames having identical member sizes but different combinations of high-strength steel and mild steel members. For this group of frames of constant stiffness, the strength-to-cost ratio was highest when the highest grade of steel was used. The deformations at working load and at failure for the high-strength frames were correspondingly larger than for identical frames of mild steel. A second phase of the study examined the behavior of four frames designed for the same plastic strength from different combinations of high-strength steel and mild steel and different combinations of rolled shapes. Frames with high-strength steel columns tended to be lower in cost. Frames with mild steel beams had superior stiffness. The judicious use of high-strength steel columns and mild steel beams in the same structure can retain a large part of the advantages of each. Author
- Structural Engineering and Building Technology