1.How does the foundation performance of the substrate affect its resistance to wind pressure deformation?
Thickness and stiffness: The thickness of the substrate is the key to wind pressure resistance. The greater the thickness, the higher the section inertia moment (stiffness is proportional to the cube of the thickness), and the stronger the ability to resist bending deformation.
Yield strength and tensile strength: Substrates with high yield strength are more difficult to deform plastically than ordinary Q235, and are not prone to permanent bending under strong wind pressure. High tensile strength can reduce the risk of tearing.
Substrate type: Cold-rolled substrates have better deformation resistance consistency than hot-rolled substrates; galvanized substrates (especially hot-dip galvanized, where the zinc layer is tightly bonded to the substrate) are not easily affected by interface peeling under long-term stress. Overall stiffness.
2.How does structural strengthening after profiling affect the performance of wind pressure deformation resistance?
Wave height and wave pitch: The greater the wave height (e.g., 30mm vs. 15mm) and the smaller the wave pitch (e.g., 100mm vs. 200mm), the higher the section moment of inertia. For example, a profiled deck with a wave height of 35mm and a wave pitch of 150mm (with a 0.4mm thick base) can withstand wind pressure 5-8 times that of a flat plate of the same thickness.
Rib design: Profiled decks with reinforcing ribs (e.g., trapezoidal ribs or curved ribs) are stiffer than ordinary corrugated decks. For example, under a wind pressure of 2kPa, the maximum deformation of a profiled deck with reinforcing ribs can be controlled within L/200 (L is the support span), while ordinary corrugated decks may reach L/100.
3.How does the installation and fixing method affect the performance of wind pressure deformation resistance?
Fixing spacing: The smaller the fixing spacing of screws or rivets, the tighter the connection between the plate and the supporting structure, and the less likely it is to be "lifted" by wind pressure. For example, in typhoon areas, the fixing spacing is usually required to be ≤300mm.
Fixing depth and method: The screws must penetrate the substrate and penetrate the supporting frame (such as purlins) by at least 15mm, and use self-tapping screws with waterproof washers (to avoid loosening); hidden fixings (such as snap connections) have stronger pull-out resistance than exposed fixings, reducing local deformation under wind pressure.
Support frame stiffness: The spacing of supporting purlins (such as 1.5m vs 3m) and the cross-sectional size (such as C-shaped steel 100mm vs 80mm) affect the overall stability. The smaller the spacing of the purlins and the larger the cross-sectional area, the firmer the support of the color-coated corrugated board and the better the anti-deformation ability.
4.How do coatings and the environment affect wind pressure deformation resistance?
Coating synergy: High-quality coatings adhere well to the substrate, making them less likely to wrinkle or peel under repeated wind pressure, preventing localized weakening that can lead to increased overall deformation. Inferior coatings, on the other hand, can peel and create "weak points," accelerating deformation.
Long-term environmental aging: Under the influence of ultraviolet rays and rain, if the substrate rusts (e.g., after the galvanized coating is damaged), this can lead to a localized loss of strength, and the ability to withstand wind pressure decreases with age (e.g., a 10%-20% decrease after 5 years).
5.How is the wind pressure resistance performance in actual application?
Ordinary areas: 0.3-0.4mm thick substrate + 20mm high-wave pressure profile, with 1.5m purlin spacing, can withstand wind pressure without obvious deformation.
Coastal areas: 0.4-0.5mm thick high-yield strength substrate + 30mm wave height + reinforced rib profile, fixed spacing ≤300mm, can withstand typhoon-level wind pressure.
Extremely strong wind area: 0.6-0.8mm thick substrate + 40mm or more wave height + encrypted fixing (spacing 200-250mm) is required, and some scenes need to be combined with sandwich structures, which can withstand level 12 without plastic deformation.