By sitting of a building in the vicinity of underground tube structure the effect of train operation excites the groundborne vibration. This vibration as a technical seismicity propagates through subsoil to the building foundations in the vicinity of the source. The solution of vibration transfer from the subsoil environment to the building structure is demonstrated using the example of a multistorey reinforced concrete building, founded on large diameter piles mutually connected with the lower foundation plate by reinforcement. On top of this plate an antivibration layer of rubber has been designed. Above the rubber there is an upper foundation plate in which the cast-in-place skeleton building structure is constrained. The elastic rubber course separates upper and lower parts of foundation plate and single footings. The structure is loaded by the groundborne vibrations from the rail systems of underground. The actual history of dynamic load measured on the pile heads was used as an input data for vibro-base insulation design and dynamic analysis of the structure. The structure model takes into account the individual storeys, broken down into the floor, foundation and roof slabs, columns, load-bearing walls and peripheral and interior girders. The layer of rubber was considered as the elastic subsoil of the Winkler-Pasternak model below the whole area of the upper part of the foundation plate and as the elastic support for columns and walls above the piles on the upper foundation plate level. The rubber stiffness in the theoretical model takes into account the type of plates used as well as the mutual superposition of surface and point support on the upper foundation plate level. The mass of the floor and foundation plates includes the masses of the nonload- bearing components (thin partitions, floorings, etc.) as well as the equivalent of the useful loads of floors, roof and terraces. The prediction of floor vibrations is determined and compared with nonisolated state of the building. The vibro-base isolated structure fulfils the standard requirements for limit vibration level for residential structure.
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- Response Analysis of Building Loaded by Groundborne Transient Vibration
Daniel Makovička Jr
- Springer Netherlands
in-adhesives, MKVS, Zühlke/© Zühlke, Nordson/© Nordson, ViscoTec/© ViscoTec, Hellmich GmbH/© Hellmich GmbH