Units Vibration Response Checking of Semi-underground Powerhouse with Late Poured Band Program

In light of the semi-underground powerhouse of Jibuluo Power Station in Equatorial Guinea,the late poured band was adopted to the powerhouse without deformation cracks and four units were made up an integral structure,which formed the large-span concrete high wall and floor more than 50 m that was beyond the maximum allowable span specified in the design standard of powerhouse. In order to testify whether excessive deformation would occur in the large-span structure and the structure safety as well as staff health would be affected during units operation,the response of powerhouse vibration was simulated respectively by harmonic response method under the working conditions of three units and four units.The conclusion indicated that the scope of structural vibration responses didn't exceed the allowable value,caused by units operation with the late poured band scheme.So this design program was reasonable.