iorio

 

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FRANCESCO IORIO

Politecnico di Milano

Born in Bergamo (Italy) in 1973, member of the Italian Order of engineers in Bergamo (n.3304) from 1999, Specialist in reinforced and prestressed reinforced concrete structures and Adjunct Professor at Milan Politecnico, is the technical director of Studio Iorio Ltd. He studied at Milano Politecnico and, after the degree (cum laude) in Building Engineering, obtained the degree of specialist at Scuola Fratelli Pesenti (Fratelli Pesenti School – post-lauream degree) inside Milan Politecnico.
From 1999 he is a lecturer inside the Structural Department of Milan Politecnico, from 2003 he is Adjunct Professor in the same Department. He is the holder of Structural courses at Building Engineering faculty of Milan Politecnico.
From 1999 to day, he held many lessons regarding precast structures, great structures, earthquake isolated structures and wood structures design. He is author of many publications on thin walled precast r.c. beams, Fiber Reinforced Concrete, connection system in precast industry and on optimization of bridge structures.
He is consultant of some of the biggest building companies in Italy (Colombo Costruzioni, De Gennaro Costruzioni, Collini Lavori, CESI), for the biggest formwork and scaffolding suppliers (PERI, Doka) and for many famous Italian architects.
He designed any kind of structures, of any shape, dimension and material (concrete, steel, wood, glass and aluminium). In Italy and everywhere in the world (Portorico, Republica Dominicana, Romania, Spain, UEA, Madagascar, Nigeria, United States of America, Brasile).

Design of nonlinear viscous dampers for the mitigation of motion of tall buildings: The Isozaki Tower – a case study

Despite its heigth (only 202 m), the Isozaki Tower in Milan is one of the slender buildings in the world. So, the biggest issue is the dynamic behaviour of the building under wind loads and the occupant comfort.
The weight, stiffness and damping of the building by itself are barely enough to guarantee a satisfactory comfort. So, the mitigation of accelerations has to be assigned to expressed designed elements, like tuned mass dampers (TMD), water dampers or viscous dampers.TMD and water dampers are usually placed inside the highest part of the buildings, occupying the most valuable areas; viscous dampers, on the contrary, can be placed outside, as in the Isozaki Tower.
Unfortunately, due to small displacements of the structure and the position of the struts and the dampers, displacements at the damper pins are small and so their elastic behaviour is not negligible. So, a specific approach, combining stochastic approach of wind loads and nonlinear structural analysis has been used. Various models have been developed, following Italian, Europeans and International Standard. The designed dampers will be early tested with a compatible wind spectra time-displacement history, and then will be mounted on the building.