Building Structures- Case Studies & Concepts
343223 - Adaptive Modular Damper for Strategic Wind-Induced Vibration Control of Tall Buildings
Friday, April 20
11:00 AM - 12:30 PM
Location: Ballroom B
Tall buildings are susceptible to wind-induced vibration, and their accelerations, as a measure of building serviceability, often exceed the acceptable level of industry guidelines. Normally, these problems can be resolved by structural stiffening or mass increase. However, structural stiffening is occasionally limited by building layouts or the requirements of sellable spaces, which leaves supplemental damping as the only viable solution. Conventional supplemental damping systems such as Tuned Liquid Sloshing Dampers (TLSD) require a large space with concrete walls and mechanical systems for water supply and drainage. Such space for TLSD should be allocated during the early design stage, and the concrete tank should be built with floor slabs. However, due to the additional stiffness introduced by secondary members, as-built building properties are normally better than the theoretical values. The necessity of a damper, or the level of damping required, cannot be easily determined before the as-built building properties are measured from field monitoring after construction. Adaptive damping systems are compartmentalized and modularized so that their usage and size can be determined after the actual building properties are measured, which introduces much more flexibility in their application. In this paper, the modular tuned liquid sloshing damper (MTLSD) is developed based on computational fluid dynamics (CFD) simulation and dynamic testing, and its application is discussed. Benefits of MTLSD are as follows: i) it does not require a permanent structure, such as concrete tanks; ii) the necessity/number of tanks can be determined after the as-built building properties are known from field monitoring; iii) since the modular damper units are light and convenient for delivery, construction cranes are not required to stay for the installation of the damper; iv) the tanks are virtually leak-free and easily replaceable, as necessary. The modular dampers will help structural engineers and building developers minimize the necessary building space for the damper, and also reduce construction costs by introducing a versatile and adaptive damping solution for tall buildings.