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11
2026
-
05
Research and Application Progress in Ultra-High-Strength Steel Structural Technology
As the demands of super‑tall and large‑span construction projects continue to evolve, ultra‑high‑strength steels with a yield strength fₙ exceeding 690 MPa are being increasingly adopted in steel structures. At present, both domestic and international research on ultra‑high‑strength steel structures has encompassed all dimensions—materials, members, connections, and structural systems—providing crucial support for engineering practice.
As the demands of super‑tall and large‑span construction projects continue to evolve, ultra‑high‑strength steels with a yield strength fₙ exceeding 690 MPa are being increasingly adopted in steel structures. At present, both domestic and international research on ultra‑high‑strength steel structures has expanded to encompass all levels—materials, components, connections, and structural systems—providing crucial support for engineering practice.
I. Study of Material Properties
Static and Cyclic Performance: The strength of ultra-high-strength steels is significantly enhanced, but their toughness and ductility are correspondingly reduced, necessitating careful control of the risk of embrittlement in the cold‑working and weld heat‑affected zones.
Fire resistance and corrosion protection: Strength degrades more rapidly at high temperatures, necessitating the use of dedicated fire‑retardant coatings and corrosion‑protection systems.
Residual stress characteristics: The distribution of residual stresses across the cross-section differs from that of conventional steel, directly affecting the stability and load-carrying capacity of structural members.
II. Component and Joint Technologies
Stability Calculations: The stability coefficients for axially loaded, flexural, and combined compression–bending members require correction, as the current codes do not yet provide complete coverage.
Connection nodes: Welded joints are prone to cold cracking, while bolted connections require increased preload and higher hole‑wall accuracy.
Beam–column joints: Strengthen the structural detailing to enhance ductility and energy dissipation, thereby meeting seismic design requirements.
III. Engineering Application Directions
It is suitable for projects with stringent requirements for self-weight and load-bearing capacity, such as super‑tall buildings, large‑span venues, cross‑sea bridges, and heavy‑duty industrial plants.
It can reduce steel consumption by 15%–30%, lower foundation costs, and enhance structural efficiency.
Ultra-high-strength steel structures epitomize the trend toward high-end materials in the industry, yet their design, construction, and acceptance require specialized technical controls. It is recommended that companies apply these materials prudently, taking into account project-specific conditions, while concurrently conducting material testing and process validation.
Important Disclaimer: This article is compiled based on key points from articles published in the journal “Steel Structures” and does not constitute a full-text reprint. The research findings are intended for technical reference only; engineering design must comply with current codes and standards and undergo dedicated review and validation.
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