Building Structures- Case Studies & Concepts

Single Abstract

343767 - Performance-Based Design for Wind-Excited Tall Buildings Equipped with High Performance Control Systems

Friday, April 20
11:00 AM - 12:30 PM
Location: Ballroom B

Performance-based design (PBD) has been widely accepted as the new design paradigm to reduce the risks to engineered facilities. While the first formal application of the method was devoted to seismic design, later it has been extended to other engineering field like wind engineering or blast engineering. In this paper, an innovative performance-based design approach for wind excited tall buildings equipped with high performance control (HPC) systems is proposed. Acceleration and inter-story drift limitations are introduced as engineering demand parameters. The wind hazard is probabilistically characterized by mean recurrence intervals (MRI) of the wind speed, representative of low, medium, high, and extreme events. The design of the HPCs is based on acceleration thresholds and it is aimed to reduce the dynamic wind-motion effects, guaranteeing good levels of functionality and habitability for different wind speeds. Depending on the desired level of quality and serviceability for the building, the designer is free to choose between the proposed objectives. The HPC is designed to achieve the selected goal. Since the installation of damping devices implies additional costs (the cost of the device itself, the initial installation costs and the maintenance costs), to compute the economic savings and losses arising from the integration of the dampers, a life-cycle analysis (LCA) is integrated in the methodology. LCA states that for a particular structure, all costs from construction to the end of the structure’s life span needs to be accounted for. The total life cycle cost (LCC) of the controlled building is computed, taking into account the initial costs and the expected failure costs. The costs associated with the failure in meeting the expected performance are related to the potential percentage of building occupants affected from motion sickness due to high wind-induced accelerations. The LCC of the controlled building can be viewed as a metric for the dampers effectiveness. This innovative design methodology leads to a rational and economically effective design of motion control systems for wind excited tall buildings.
The proposed approach is expected to further the application of PBD paradigm to buildings that are equipped with HPC. The developed LCA tool will provide robust tool to estimate the effectiveness of the HPC and conditions that would justify the initial investment on them. The methodology increases the resilience of the community by designing the buildings under wind events in such a way that target performance levels are achieved while the life cycle cost of the structural system is accounted for. The proposed framework extends the used of PBD to a whole new area that has not been studied before. This innovative methodology that facilitates the use of state-of-the-art control systems for wind mitigation will help the structural engineering profession move forward towards its vision of public safety and risk assessment.

Laura Micheli

PhD candidate
Iowa State University

n/a

Presentation(s):

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Simon LaFlamme

Associate Professor
Iowa State University

n/a

Presentation(s):

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Alice Alipour

Assistant Professor
Iowa State University

Presentation(s):

Send Email for Alice Alipour


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343767 - Performance-Based Design for Wind-Excited Tall Buildings Equipped with High Performance Control Systems



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