Research and Progress on Application of High Performance Steel
High performance structural steel with superior material properties such as high strength,high ductility,high toughness,better weldability,improved weather resistance and fire resistance,has been widely applied in building and bridge steel structures.Efficient and rational application of high-performance structural steel can significantly save steel and protective coatings,reduce production,transportation,and installation costs,decrease welding workload and carbon emissions.Further reducing the full life cycle operation and maintenance costs of steel structures.This paper focuses on the development and progress of high-performance structural steels such as high-strength steel,ultra-high strength steel,fire-resistant steel,and weathering steel.This paper reviews the relevant regulations on the application of high-strength steel in the current technical standard system of building and bridge steel structures,and analyzes the advantages of ultra-high strength steel grade of 690 MPa and above through engineering application cases.Recommendations are proposed for the research and development of structural systems using ultra-high strength steel,and drafting relevant structural design and construction standards.The advantages of high-performance steel can be further demonstrated in improving the fire and corrosion resistance of steel structures from the material level.The development trend of using weathering steel in bridge steel structures and fire-resistant steel in building steel structures is summarized.An innovative concept of steel structure using fire-resistant steel to form a"fire-resistant Steel+Concrete+Intumescent coating"(SCI)structural systems is proposed.The steel structural system without or with less fire-resistant coating can be realized,and the fire safety evaluation method of SCI structural system is suggested.The use of green and low-carbon high-performance steel to construct building and bridge structural systems is the new direction and advancement of the steel structure.Meanwhile the welding and bolt materials,as well as design fabricating and installation standards have been developed to promote the application of high-performance steel structure systems and contribute to the achievement of the national"dual carbon"strategic goals.
high performance steelhigh strength and super-high strength steelfire-resistant and weathering steelfire resistance of steel structure
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