How to Design the Wind Load Resistance of UHPC Curtain Walls: Full-Process Optimization from Calculation to Detailing

Wind load resistance design of UHPC curtain walls is core to ensuring the safety of high-rise buildings. It must take into account factors such as the wind load level at the project location, curtain wall height, and component dimensions, and is achieved through three key steps: wind tunnel testing, structural calculation, and detailing optimization. As a company that participated in formulating UHPC standards, Qinglong employs BIM technology and finite element analysis to ensure wind load resistance performance meets code requirements, and multiple high-rise projects have been verified as compliant through field measurements.

Wind load values and wind tunnel testing: accurately obtaining the design basis. The first step in wind load resistance design is determining the standard wind load value, calculated in accordance with the "Load Code for the Design of Building Structures" (GB 50009-2012), in combination with the basic wind pressure at the project location (e.g., ≥0.7kN/㎡ in coastal areas, ≥0.3kN/㎡ in inland areas), curtain wall height (wind load increases by 5%-8% for every 10m of additional height), and terrain conditions (mountainous areas and canyons require consideration of local wind pressure amplification coefficients). For super high-rise and irregularly shaped curtain walls, Qinglong commissions professional institutions to conduct wind tunnel tests, simulating the effect of the actual wind field on the curtain wall to obtain more accurate wind load data. For the UHPC curtain wall of the Shenzhen Yirui Biotechnology Building, with a height of 24m and a basic wind pressure of 0.55kN/㎡, the standard wind load value was set at 1.2kN/㎡ after wind tunnel test correction, ensuring the design errs on the safe side.

Structural calculation and material performance support: ensuring component wind load bearing capacity. The wind load resistance of UHPC curtain walls relies on material strength and structural design. Qinglong's UHPC material has a compressive strength ≥150MPa, flexural strength ≥25MPa, and shear strength ≥12MPa, providing the foundation for wind load resistance. Component models are built with finite element analysis software to simulate stress distribution under wind loads and optimize component thickness and reinforcing rib layout. For large-sized components (single panel area >6㎡), additional reinforcing ribs are added at edges and stress concentration areas, with rib cross-sections ≥20mm×30mm and spacing ≤300mm; the pull-out and shear bearing capacity of anchors and connectors must be ≥1.5 times the forces generated by wind loads. For the UHPC curtain wall of the Yangshengtang Pharmaceutical Hangzhou Industrial Park, after calculation and optimization, component thickness was adjusted from 35mm to 30mm while still meeting wind load resistance requirements, saving both cost and weight.

Detailing optimization: enhancing the overall wind resistance stability of the curtain wall. Beyond the strength of the components themselves, detailing design is crucial to overall wind load resistance: a "multi-point anchoring + flexible connection" approach is adopted, with anchor spacing ≤400mm, and flexible connectors allow components to undergo slight displacement (≤10mm) under wind loads, avoiding stress concentration caused by rigid constraints; wind-resistant transoms are arranged horizontally and wind-resistant mullions vertically to form a frame support system, with transoms and mullions connected by high-strength bolts for a wind load bearing capacity ≥2kN/m; wind-resistant trusses are installed on large-span curtain walls to further improve overall stability. The 30,000㎡ GRC curtain wall of the Shenzhen Pingshan High-tech Zone Comprehensive Service Center (technically of the same origin as UHPC) adopts this detailing design, achieving wind load resistance of 1.5kN/㎡ and meeting the strong wind requirements of coastal areas.

Construction and testing: ensuring design implementation and performance verification. During construction, anchor installation accuracy is ≤±2mm and anchoring depth ≥100mm to ensure secure connections; after component installation, on-site wind resistance performance testing is carried out using the pressure chamber method, applying 1.2 times the design wind load for 30 minutes; the curtain wall passes if there is no deformation, no leakage, and no loosening. For every high-rise UHPC curtain wall project, Qinglong commissions third-party institutions to conduct on-site wind resistance testing, with a 100% pass rate. In addition, the fastening condition of anchors and connectors is inspected regularly, and any looseness is reinforced promptly to ensure stable long-term wind resistance performance.

Wind load resistance design of UHPC curtain walls is a systematic project, requiring whole-process control from load value determination, material selection, and structural calculation to detailing design and construction testing. With professional calculation capabilities, optimized detailing design, and strict construction control, Qinglong provides reliable wind load resistance solutions for UHPC curtain walls across different regions and heights. For owners and designers, wind load resistance performance is key to curtain wall selection for high-rise buildings, and Qinglong safeguards project safety with its technical strength.