HSA800 is a new high strength steel (HSS) plate for building structures developed by POSCO and RIST in 2011. It has upper and lower bounds for yield (Fy) and tensile (Fu) strength as of 650-770MPa and 800-950MPa, respectively, with yield ratio (Fy/Fu) limit as of 0.85 which make steel quality more reliable and enhance the seismic resistance of structures. As made by TMCP, it has a good weldability without increasing carbon percentage. The objective of this study is to provide alternative design of mega-structural members of the Lotte World Tower (555m, 123 story), a first super-tall building in Korea, using HSS considering structural safety, constructability, and cost-effectiveness. Steel outrigger trusses, belt-trusses and steel exterior columns were selected and analyzed to evaluate the structural performance between original and alternative designs using HSS. The results show that HSS can be applied to the members which do not affect lateral stiffness of a building and, in this study, approximately 1100tons of steel were saved. It implies that HSS can save overall construction costsmanufacturing, delivery, and erection costsby reducing mega structural member size. HSA800 was very first applied to the Lotte World Tower based on the results of this study.
The structural steel produced in domestic is classified into 5 grades. For economic structural design, the structural engineers need to choose optimal steel grades for structural member types, but the related data is not sufficient. Recently, high strength steel with yield strength in 650MPa was developed in domestic. It provides structural engineers with the wider range of structural steel strength, which leads to the larger difference in economic evaluation. In this paper, the economic evaluation of high-strength steel in building structures is investigated, by applying structural steel with 235MPa, 325MPa and 650MPa in yield strength to various types of structural members, and can be used as basic data for economic structural design. Table 1은 각 강재별 요구성능을 비교한
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