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71. SEISMIC PROTECTION WITH FLUID VISCOUS DAMPERS FOR THE TORRE MAYOR, A 57-STORY OFFICE TOWER IN MEXICO CITY, MEXICO

The new 57 story Torre Mayor Building is the now the dominant structure in the Mexico City skyline. It is also the first tall building to utilize large Fluid Viscous Dampers as a primary means of seismic energy dissipation. A total of 98 dampers are used, including 24 large dampers, each rated at 570 tonnes of output force, located in the long walls of the building. The short walls utilize 74 smaller dampers, each rated at 280 tonnes of output force. The damping technology successfully implemented for Torre Mayor is now being used on five other tall buildings, including three in the USA, and two in Japan.

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2. Bridge Design

This paper reports on a non-linear analysis of a bridge supported on sliding bearings with elastomeric restoring spring and viscous dampers. Results were verified with shake table tests.

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10. INVESTIGATION OF LIGHT POLE BASE INTEGRITY – RICH STADIUM

Light poles at Rich Stadium in Orchard Park, N.Y., were showing incipient failure of their hold-down bolts, due to wind excitation. This paper describes the measures used to alleviate this problem, including the addition of viscous dampers between the stadium structure and a point around one third up on the light poles.

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