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Tokyo D. I. a. Building

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  Presntedby:-  AbhishaPatilSalahuddin M. Khalid YashashreePatil Tokyo D. I. A. Building A Case Study on Base Isolaters in a Building Theory & Design of StructuresFourth Year (Semester 7 th )  Introduction of Tokyo D. I. A. Project name: Location: Design / Construction / Supervision:Use: Building area: Total floor space: Number of floors / Structure of existing (addition) building: Weight of existing building: Tokyo DIA Building1-28-38 Shinkawa, Chuo-ku, Tokyo Mitsubishi Logistics CorporationTakenakaCorporationOffice Building6,414.5 Sq. m72,472.9 Sq. m12 flr. above and 1 flr. below ground Base isolation area 1,041,300 kN(including 41,700 kNaddition)Overview and basic details of the project in which the base isolators are installed.  Overview of Building Plan Analysis of building plan in order to determine the exact requirements for the building’s safety. The Tokyo DIA Buildings 1-4, were built from 1973-1985 and are used as computer server buildings. All four buildings are of the same height.The owners wanted highly functional base isolation improvements so that not only would the safety of the buildings and their occupants be enhanced during a major earthquake, but computer functions and equipment would also be protected.A proposal was made to consider all buildings as one and cut off parts of the existing cast-in-place concrete piles, install base isolation devices, and give the buildings a foundation base isolation structure.The buildings are occupied on a 24-hour basis, but all construction work, including the cutting, could be completed with minimal noise and vibration while the buildings were being occupied.  Considerations for Isolators After the analysis of plans proposal was made and there were some considerations for overall safety of structuresThe earthquake resistance apparatus consisted of 264 natural rubber bearings and 28 wall-type viscous dampers. Part of the existing cast-in-place concrete piles would be cut out and base isolation devices installed there, and the building would be retrofitted into the foundation base isolation structure.A rubber bearing was installed on the upper end of each existing pile. Modified rubber bearings, including 230 rubber bearings of 700φ, and 14, 11, 4, and 5 rubber bearings of 750φ, 800φ, 900φ and 1000φ, respectively, were set up to respond to axial forces.The rubber bearings used in this project had a long-term allowable surface pressure of ≦ 15N/mm2. This made it possible to have a primary natural period of less than four seconds for the base isolation structure.
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