29/07/2026
🚨 The Common Oversight That Can Compromise Steel Structures in Hong Kong’s High-Rise and Retrofit Projects
Most engineers diligently check loads, size members, and verify bending stresses.
But one critical assumption often gets overlooked — and it can lead to sudden instability:
Assuming full lateral restraint for the compression fl**ge when it isn’t truly provided.
In Hong Kong’s dense urban environment — with tight sites, alternation & addition (A&A) works, and complex retrofits — this mistake is especially risky. Lateral-torsional buckling (LTB) can occur well before the steel yields, turning a “safe” design into a vulnerability during construction or service life.
Here’s what happens:
• Under bending, the top (compression) fl**ge tries to buckle sideways if not adequately braced.
• The beam twists and displaces laterally — a stability failure, not just a strength issue.
• Factors like longer unbraced lengths (common in open floors or temporary works) and slender I-sections amplify the risk.
Key prevention steps we emphasize at Fotama:
1. Provide reliable lateral bracing (e.g., via slabs, purlins, cross-frames, or dedicated restraints).
2. Minimize unbraced lengths with intermediate supports where needed.
3. Consider section choice — closed sections often offer better torsional resistance.
4. Always verify stability separately from strength checks, especially in construction stages and A&A projects.
At Fotama Engineering Consultants Limited, we integrate these stability considerations into every structural analysis and temporary works design to keep projects safe, efficient, and compliant in Hong Kong’s challenging conditions.
What’s one design or site oversight you’ve seen that surprised you? Share in the comments 👇
