Retrofit of Athens National Gallery (Washington)


( 3rd fib International Congress - Washington 2010)

V.G. Bardakis, J. Stathopoulos, G. Ferentinos, K. Liontos


Building-B of Athens National Gallery is a special five-storey concrete building constructed in the mid-1970s. The frame structural system mainly consists of reinforced concrete columns and prestressed concrete beams, while few lightly-reinforced concrete walls support stairs and elevators. Seismic joints divide the building in three independent sub-systems. The higher floors have 6.00m average height and 12.00m span of primary beams.

A steel floor will be added to the existing system for the expansion of the Gallery. The "Life Safety" level for the design earthquake of the Greek Seismic Code is selected as performance goal.

General rules of the Greek Code for structural interventions and the relevant Part 3 of Eurocode 8 are used for the Analysis. The calculation of the effective stiffness of prestressed concrete elements is based on section moment-curvature diagrams, while the pretension of tendons is taken into account.

The sub-systems are being connected at floor levels and shotcrete jackets are designed for the strengthening of the existing shear walls. The regions, where plastic hinges are expected to be created, are being strengthened with jackets of Fiber Reinforced Polymers. For the prestressed regions, decompression or yielding of reinforcement is acceptable, while yielding of tendons is avoided.