The article studies damage of the Cast-in-place stairs of frame structures in Wenchuan earthquake, such as ladder board fracture, short column failure of corner column, damage of constructional column, platform beam and plate failure and etc. Based on the 2001 edition of the code for seismic design of building regulations and the design method of stair in engineering, we analyze the cause of the earthquake damage, show weaknesses of the stairs design method and construction measure in the old code, and put ...
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