Abstract—The application of high-strength steel in steel structures is conducive to reducing the amount of steel used and the weight of the structure, but the increase in steel strength also results in a higher flexural strength ratio and to a certain extent a lower ductility, which is not conducive to the application in the field of building structures. In this study, a series of monotonic tensile tests were carried out on the new high-performance seismic structural steel developed by HISCO to analyse the static mechanical properties of the base material and butt welds at different plate thicknesses, different thickness delamination positions and different sampling directions. The results show that the new steel has a high strength while maintaining a low flexural strength ratio, which satisfies the requirements of the Code for Steel Plates for Structural Use in Buildings and can be used in building structures with special requirements for steel strength. 45mm steel plate mechanical properties at different thicknesses meet the distribution pattern of gradually decreasing strength and increasing ductility from both sides of the surface to the middle layer.

Keywords—high-performance structural steel, thick steel plate, welded specimen, static properties, stress-strain curve

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