High Rise Buildings

White Paper

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.

Technical Brief

68. HISTORY, DESIGN, AND APPLICATIONS OF FLUID DAMPERS IN STRUCTURAL ENGINEERING

This paper provides a broad overview and a guide to implementation with specific case studies being provided from four of more than 240 major buildings and bridges equipped with fluid dampers by Taylor Devices, Inc.

White Paper

62. STRUCTURAL CONTROL OF HIGH RISE BUILDING USING A TUNED MASS WITH INTEGRAL HERMETICALLY SEALED, FRICTIONLESS HYDRAULIC DAMPERS

Structural control of large buildings using tuned mass damper systems has gained wide acceptance in recent years. Significant structural performance improvements during wind storms have been realized using both active and passive systems. Disadvantages of employing active systems include high engineering and implementation costs, high maintenance costs, unnecessary system complexities, and the requirement for a continuous and non-interrupted power supply. A design for a passive tuned mass damper system is presented with analytical simulations and component test results. These demonstrate the effectiveness of using a tuned mass in conjunction with a maintenance free, hydraulic damper, having frictionless flexural seals to successfully attenuate the response of a high rise building subject to severe wind inputs.

Case Study

58. VISCOUS-DAMPER WITH MOTION AMPLIFICATION DEVICE FOR HIGH RISE BUILDING APPLICATIONS

Adding damping by the use of various damping devices has become an accepted method to reduce wind induced vibrations in tall buildings. An interesting example of a 39 story office tower is presented where large projected accelerations are the result of vortex shedding of an adjacent existing 52-story building. Viscous dampers and a toggle brace type motion amplification system are used to suppress the anticipated accelerations. A description of the damping system and its analytical simulation are discussed. This paper includes a nonlinear analysis of the tower, with time history forcing functions derived from wind tunnel testing. Cost data for the damper system is also presented.

Product Info

56. BUILDINGS: DESIGN FOR DAMPING

The end of the Cold War in 1990 heralded a restructuring period for the American military and defense industry. In the civil engineering field, high capacity fluid dampers have transitioned from defense related structures to commercial applications on buildings and bridges subjected to seismic and/or wind storm inputs. Because fluid damping technology was proven thoroughly reliable and robust through decades of Cold War usage, implementation on commercial structures has taken place very quickly. This paper provides a broad overview as well as a guide to implementation; with specific case studies for four of the more than 300 major buildings and bridges equipped with fluid dampers by Taylor Devices, Inc., a defense contractor from the Cold War years.

White Paper

52. DEVELOPMENT AND TESTING OF AN IMPROVED FLUID DAMPER CONFIGURATION FOR STRUCTURES HAVING HIGH RIGIDITY

Structures with high rigidity experience relatively small deflections and interstructural velocities under seismic shock. This means that conventional energy dissipation devices may not be feasible or cost effective. An improved damper configuration has been investigated, utilizing a toggle mechanism to magnify internal structural deflections. This provides a more effective way to add damping to a stiff structure. Experimental results were obtained from a 32,000 lb. test structure utilizing two fluid dampers and two toggle brace elements. Test inputs included around eighty individual earthquake transients, varying both in wave form and intensity. The results demonstrated the ability of the toggle mechanism to magnify displacements significantly. The toggle brace damping system appears to be an excellent solution to the addition of supplemental damping devices to rigid structures of all types. Advantages include relatively low damper cost, a simple bracing element design, and low installation cost.

RESOURCES

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

68. HISTORY, DESIGN, AND APPLICATIONS OF FLUID DAMPERS IN STRUCTURAL ENGINEERING

62. STRUCTURAL CONTROL OF HIGH RISE BUILDING USING A TUNED MASS WITH INTEGRAL HERMETICALLY SEALED, FRICTIONLESS HYDRAULIC DAMPERS

58. VISCOUS-DAMPER WITH MOTION AMPLIFICATION DEVICE FOR HIGH RISE BUILDING APPLICATIONS

56. BUILDINGS: DESIGN FOR DAMPING

52. DEVELOPMENT AND TESTING OF AN IMPROVED FLUID DAMPER CONFIGURATION FOR STRUCTURES HAVING HIGH RIGIDITY

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