What accelerated the development of the collapse accident of a middle school auditorium in Taiwan Province Province?

After the auditorium was built, it was in a state of leakage for a long time, and the top steel structure and concrete were eroded by leakage for a long time, which led to the decline of structural bearing capacity.

At the same time, in order to repair the leakage, the company found a new impervious roof, but due to poor drainage on the roof, a lot of water accumulated on the roof on the day of the accident, which exceeded the roof load. Due to the long-term corrosion of the structure itself, the plastic reaction period was lost, so the damage occurred instantly, leading to tragedy.