As a product of modernization, the point-supported glass curtain wall has brought many advantages to architectural design. However, it also comes with certain design limitations that must be carefully considered. Understanding these issues is essential to making informed decisions when choosing the right system for your project. Let’s explore some of the key design vulnerabilities.
1. One of the main challenges lies in the selection of stainless steel components used in the connection claws and bolts. These accessories are typically made from stainless steel, but the market today is filled with a wide range of options—some of which are not suitable for this specific application. With over 200 types of stainless steel available, not all are appropriate for use in point-supported curtain walls. The fittings are exposed to the elements, so corrosion resistance is crucial. We recommend using a type with at least 18% chromium and 8% nickel, as this combination offers superior protection against oxidation. Unlike regular steel, which continues to rust once oxidized, stainless steel forms a protective oxide layer that prevents further damage, even if it gets scratched or damaged.
2. Another common issue involves the connection between the metal plate and the glass in glass-rib supported systems. This design can sometimes be inefficient, especially when it comes to load distribution. Traditional all-glass curtain walls face limitations when it comes to height, as tempered glass becomes impractical beyond 6 meters. In such cases, non-tempered glass is often used, which is less safe and more fragile. Glass-rib supported curtain walls offer a better solution by dividing the glass into smaller sections, allowing for thinner, stronger, and safer tempered glass. However, the way the glass is fixed—often using multiple bolts—can actually reduce its structural integrity. Testing has shown that the force on each hole is distributed equally, meaning that if one hole fails, the entire panel can break. Therefore, it's important to limit the number of fixing points based on the size and thickness of the glass rib.
3. When using laminated or insulating glass in point-supported systems, special attention should be paid to the alignment of holes. Laminated and insulating glass consist of multiple layers, and during the manufacturing process, drilling can lead to slight variations in hole positions. If the deviations don’t match up, the final product may not fit properly. To prevent this, it's common practice to make the inner glass hole slightly larger than the outer one, ensuring that any misalignment is accommodated without affecting the overall performance of the system.
Although there are still challenges to overcome, many architects and engineers are actively working to improve these systems. With ongoing research and innovation, we can expect more efficient, safer, and aesthetically pleasing solutions in the future. By understanding the current limitations, we can make smarter choices and enjoy the benefits of modern architectural design.
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