00:06In the mid-20th century, between 1920 and 1970, the world experienced a period of great construction.
00:14In all capital cities, you can still see these reinforced concrete buildings, sometimes looking tired, but incredibly resilient.
00:23They bear loads, overloads and disorders that our modern buildings sometimes handle less well.
00:29At the time, engineers calculated structures according to serviceability limit states, the SLS of BAL-91 and
00:37For seismic, the PS-92.
00:39They built large, solid structures with enormous masses.
00:44As a result, a real lifespan that often exceeds 150 to 200 years.
00:49In the 2000s, the Eurocodes changed the philosophy.
00:53The ultimate limit state (ULS) is now calculated.
00:56The models are optimized, more accurate, based on the detailed physics of materials, coefficients, moduli, and in particular the modulus of
01:05Jung, derived from gravitational traction measurements.
01:08Ultimately, we apply rules derived from multiple, almost quantified studies to deduce standards and...
01:15very precise coefficients.
01:17This optimization comes at a price.
01:18Modern buildings are clearly designed for a lifespan of 50 to 60 years.
01:24It is written into the Eurocodes, into the very logic of the calculation.
01:28We build lighter, more economically, but less sustainably than the giants of the last century.
01:35Thank you for listening.
01:36That really touches me.
01:38Don't hesitate to subscribe and share.
01:41Design for Life.
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