MATERIAL PROPERTIES AND STRUCTURAL DESIGN RECOMMENDATIONS FOR STEEL FRAMED BUILDINGS USING HIGH STRENGTH STEEL

摘要

The primary objective of this study is to evaluate possible applications of high strength steel in building design and construction. Coupons made of different kinds of structural steel (A36, A514, A572 and A656) were tested to investigate material properties such as yield strength, ductility, etc. Several member design examples were performed using the current AISC (American Institute of Steel Construction) Construction Manual. Local buckling had a critical effect on the compressive and flexural strengths especially for the high strength steel members. For example, due to non-compact effect, the design flexural strength of a W10 x 33 member is increased only 81.30% while the yield strength of steel is doubled. Because high strength steel behaves differently from conventional steels with F_y ≤ 65 ksi (448 MPa), these design codes may include more details on the high strength steel to consider its full performance potential appropriately. It is obvious that high strength steel can reduce the weight of building, but the serviceability becomes a concerning factor. The deflection of buildings is increased by replacing conventional steel with high strength steel. In this study, two 10-story steel frame buildings were modeled using a structural analysis and design software to compare the effect of high strength steel on deflection under lateral loads. Based on these simulations, columns of lower stories can be made of high strength steel in order to use space more efficiently and reduce the building weights without local buckling issues.