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Full Scale 4-Storey PFC Testing Successful to Streamline Midrise Structural Calculations

Hidehiko Fumoto

By Hidehiko Fumoto

Deputy Director and Manager Technical Services, Canada Wood Japan

January 2, 2019

Thanks to the past 2-hour fire resistive approvals, midrise PFC buildings of up to 6 storeys are now technically achievable in Japan. However, the hurdles are still too high for the structural designers to seek the building permits. This is due to the complicated procedures currently required. To currently apply for the building permits on PFC buildings with 4 storeys or higher, expert peer checks and the “retained lateral force calculations” are required whereas these are not obligated to P&B buildings. Therefore, Japan 2×4 Home Builders Association decided to establish a technical project to remove these discriminative procedures required only to PFC buildings. Their approach was to seek the MLIT’s agreement to omit those additional requirements under the condition of confirming a structural safety by full scale testing. COFI has been attending all the technical meetings as one of the main project committee members. After half a year of preparation, a full-scale static loading test was conducted on November 19th at the Structural Composite Test Laboratory of Building Research Institute in Tsukuba City. Lateral loads were applied to each floor beam of the 4 storeys until the shear walls on the first-floor level showed the deformation of 1/14 radian. The interim report showed a success indicating less damages found than what was predicted in the preliminary analysis made using a numerical modelling as shown in the drawing here.