UHPC Curtain Wall Wind Load Resistance Design: Code Requirements and Technical Solutions

Wind load resistance is one of the core indicators in UHPC curtain wall design, directly related to the safety and stability of buildings in strong wind environments. With 28 years of curtain wall engineering experience, Qinglong Group participated in discussions on the revision of the Load Code for the Design of Building Structures (GB 50009), and developed a full-process design system of "wind load calculation - component strength design - connection joint reinforcement - simulation testing and verification", successfully completing strong wind environment projects in Hainan, Shanghai, coastal areas and other regions, with wind load resistance capacity up to 2.5kPa.

1. Wind Load Calculation: Precise Values Based on Environment and Height

The standard value of wind load is calculated according to GB 50009: ω_k=β_gzμ_sμ_zω₀, where ω₀ is the basic wind pressure (typically 0.55-0.85kN/㎡ in coastal areas, 1.0-1.5kN/㎡ in typhoon zones), μ_z is the wind pressure height variation coefficient (increasing with building height), μ_s is the wind load shape coefficient (1.3 for flat curtain walls, 1.5-2.0 for irregular curtain walls), and β_gz is the gust coefficient at height z (1.2-1.5). For a super high-rise project in Hainan (height 150m, basic wind pressure 0.75kN/㎡), Qinglong calculated a standard wind load value of 2.2kPa at the top, with the design value taken at a safety factor of 1.2 times (2.64kPa). Meanwhile, the local wind pressure amplification factor must be considered; the wind load on edge and corner areas should be multiplied by a coefficient of 1.5-2.0. In the Shanghai New World project, Qinglong carried out reinforced design for the edge and corner areas of the curtain wall to resist localized strong winds.

2. Component Strength Design: Structural Optimization Adapted to Wind Loads

Panel thickness optimization: Adjust the UHPC panel thickness according to wind load magnitude — 25-30mm thick for low wind pressure areas (ω_k≤0.8kPa); 30-35mm thick for medium wind pressure areas (0.8-1.5kPa); 35-50mm thick for high wind pressure areas (≥1.5kPa). For a project in a typhoon zone, Qinglong selected 45mm thick UHPC panels with compressive strength ≥160MPa and flexural strength ≥35MPa, meeting wind load resistance requirements. Stiffening rib design: Longitudinal and transverse stiffening ribs are set on the back of panels (width 50-80mm, thickness consistent with the panel) to enhance the flexural rigidity of the panels. In a coastal project, Qinglong increased the flexural load-bearing capacity of panels by 40% through stiffening rib design. Special design for hollowed-out panels: When the hollow-out ratio is ≤50%, a reinforcing frame must be set around the hollowed-out areas. For the hollowed-out panels (hollow-out ratio 52%) of the Ouargla Hotel in Algeria, Qinglong designed 100mm wide reinforcing frames to ensure that the wind load resistance performance is not compromised.

3. Connection Joint Reinforcement: Key Guarantee for Wind Load Resistance

Anchor strength reinforcement: High-strength stainless steel anchors (SUS304/SUS316) are selected, with a single-anchor pull-out load-bearing capacity ≥8kN and shear load-bearing capacity ≥5kN. For high wind pressure projects, Qinglong selected thickened anchors (thickness ≥10mm) and increased the number of anchors (≥6 per panel). Joint anchorage design: The anchorage depth of embedded parts into the main structure is ≥100mm, fixed with double bolts. In super high-rise projects, Qinglong adopted composite anchorage of chemical anchors + mechanical anchors, increasing the pull-out load-bearing capacity by 50%. Elastic connection design: Elastic gaskets (thickness 3-5mm) are set between anchors and panels, and between anchors and keels, to absorb the vibration and deformation caused by wind loads and prevent joint fatigue damage. The elastic gaskets selected by Qinglong have excellent aging resistance, with a service life ≥20 years.

4. Simulation Testing and Engineering Verification: Qinglong's Wind Load Resistance Technical Advantages

Wind tunnel test verification: For curtain walls with complex shapes (such as double-curved surfaces and large spans), wind tunnel tests are conducted to simulate actual wind load effects and optimize the design scheme. Qinglong conducted wind tunnel tests for the double-curved curtain wall project of the Guangxi New Media Center, and the adjusted design scheme improved wind load resistance by 25%. Static load testing: Before leaving the factory, components undergo a static wind load loading test at 1.5 times the design wind load; they are deemed qualified after maintaining 30 minutes with no deformation and no damage. All UHPC curtain wall panels produced by Qinglong pass this test. Engineering case verification: The Hainan International Convention and Exhibition Center project (basic wind pressure 0.8kN/㎡) has a wind load resistance design value of 1.8kPa and suffered no damage under actual typhoon conditions; a super high-rise project in Shanghai (height 200m) has a wind load resistance design value of 2.5kPa, meeting strong wind environment requirements. As a national "Specialized, Refined, Distinctive and Innovative" enterprise, Qinglong's wind load resistance design technology has been applied to thousands of projects, and its related experience has been incorporated into industry technical guidelines.

The wind load resistance design of UHPC curtain walls requires comprehensive consideration of environment, height and shape to ensure a balance between safety and economy. Adhering to the principle of "Safety First, Scientific Design", Qinglong Group, with its deep technical expertise and engineering practice, provides precise wind load resistance design solutions for projects in different wind environments, contributing to safe and durable building curtain walls.