Building Structures- Case Studies & Concepts

Single Abstract

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.

Un Yong Jeong

Gradient Wind Engineering Inc.

Un Yong is an engineer with extensive experience in wind tunnel testing and as a project manager and researcher. Un Yong’s current responsibilities include supervising technical matters related to measurements and analysis of surface pressures on structures and wind-induced vibrations of tall thin structures, as well as development of dynamic wind load analysis procedures for structures.

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Steven Hall

Gradient Wind Engineering Inc.

Steven is an aerodynamics engineer with experience in simulation of complex fluid flows and wind tunnel testing. He joined GWE in 2014 and is responsible for performing all CFD analysis, as well as continually improving and developing CFD techniques.

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Andrew Sliasas

Gradient Wind Engineering Inc.

Andrew is a mechanical engineer specializing in wind engineering and the simulation of complex flows. Previously, he has worked at McMaster University in Hamilton, Ontario as a research engineer studying the highly unsteady hydrodynamic behaviour of rowing oar blades – a continuation of his Masters thesis. Andrew joined GWE in 2012, and is responsible for managing projects on a day-to-day basis, interpreting the wind tunnel data, and for overall quality control.

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Kevin Tarrant

Gradient Wind Engineering Inc.

Kevin is a wind engineering specialist who mainly works on structural wind loads and building motions at Gradient Wind Engineering Inc.

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