International journal of steel structures (국제강구조저널)

Korean Society of Steel Construction (한국강구조학회)
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Material Performance Evaluation and Super-tall Building Applicability of the 800 MPa High-strength Steel Plates for Building Structures

  • Received : 2014.02.27
  • Accepted : 2014.12.11
  • Published : 2014.12.31
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Abstract

The main advantage of High Strength Steel (HSS) is to decrease material thickness at the same performance level and to increase the performance level with unchanged dimensions. The demand of HSS is getting increasing to satisfy the increasing technical requirements as well as the needs for good handling during constructions as building height and span is getting taller and longer. New 800 MPa high (tensile) strength steel plate for building structures, namely HSA800, was developed in 2011. As made by TMCP, it has a good weldability without increasing carbon contents. Material performance tests of HSA800 for 10-100 mm thick plates are conducted to verify if satisfying the Korean Industrial Standard (KS) provisions. Then applicability of HSA800 in a super-tall building is evaluated by creating two analytical models (with or without HSA800) for comparison in accordance with five performance index - lateral deflection, column shortening, natural periods, overturning moments and total amounts of materials. In this case, HSA800 is applied to gravity members such as perimeter columns, spandrel beams and belt trusses rather than lateral force resisting members to keep the building lateral stiffness. Material test results show that HSA800 satisfies all chemical and mechanical KS provisions and can be used to design structures per current design codes. The behavior of the model using HSA800 was similar to that of normal strength steel (SM570) only model and satisfied all five performance index. Saving amounts of steel quantity by using HSA800 were approximately 4500 tons, which is 30% of total gravity member amounts and 10% of total steel amounts used in this model. Consequently, use of HSS, such as HSA800, may bring the added benefit of reducing steel consumption compared to normal strength steels and decreasing carbon dioxide ($CO_2$) emissions from steel and member production processes.

Keywords

Acknowledgement

Supported by : Korean Ministry of Land, Infrastructure and Transport

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