How To Extend The Service Life Of Steel Structure Buildings?

Steel structures are renowned for their excellent durability. But what is their actual service life? Technically, with their superior durability, steel structures can have a lifespan of approximately 100 years, evidenced by many century-old industrial buildings across Europe.

To maximize the longevity of your steel structure building and ensure it reaches its full potential, implementing the following four key strategies throughout the entire project lifecycle—from material selection to operation—is essential.

Selecting the appropriate steel grade based on the structural demands and specific usage scenario is paramount to ensure strength perfectly matches the need. This rigor must extend to every component; even every connecting bolt must comply with long-term service standards. Compromising on any material can become a weak link that shortens the entire structure's life.

A precise design—with clear material specifications, strength parameters, and accurate structural calculations—is the foundation, eliminating hidden dangers from the outset. During construction, the use of certified fireproofing and welding materials, along with proper connection detailing, is critical. The execution of standardized processes, such as applying two coats of anti-rust paint on steel members and using color steel sheets with a ≥180 g/m² hot-dip galvanized base and a "two-coat, two-bake" finish, significantly enhances the building's peripheral corrosion resistance.

While dry environments pose minimal corrosion risk, high humidity and highly corrosive atmospheres demand focused attention. Corrosion does not just cause unsightly rust; it leads to uneven surface pitting which creates stress concentrations. This can lead to premature failure, and under repeated dynamic loads, it drastically reduces the structure's fatigue strength, increasing the risk of brittle fracture. Effective protection, with anti-corrosive coatings being the most common method, is non-negotiable to safeguard the building's lifespan.

The building's manual should clearly outline usage conditions and maintenance requirements. Conducting regular inspections and maintenance at defined intervals is the most effective way to extend its service life. Under normal environmental and stress conditions, the corrosion rate for steel is approximately 0.4 mm per decade (excluding highly corrosive environments). This highlights the critical importance of monitoring environmental conditions and adhering to a consistent保养 (maintenance) regimen.

By rigorously applying these measures, you can significantly extend the service life of your steel structure, ensuring its long-term safety, stability, and return on investment.