14th Americas Conference on Wind Engineering

American Association for Wind Engineering
May 17–19, 2022
Lubbock, Texas

The American Association for Wind Engineering (AAWE) will host their 14th Americas Conference on Wind Engineering (ACWE) in Lubbock, Texas, May 17–19, 2022. The conference will explore the connections between windstorm investigations, engineering research, wind energy research, and social, behavioral, and economic outcomes by bringing together experts in areas such as wind climate, wind loading on structures, performance of structures in wind, environmental effects of wind, socioeconomic impacts of wind hazards, and wind energy.

Azin Ghaffary, Ph.D., Exponent associate, will deliver two talks. Her first presentation will explore “Aerodynamic Feedback Variation Due to Linear and Nonlinear Structural Response of Buildings.” There is growing interest among the wind engineering community to understand nonlinear building response under extreme wind loads, which cannot be experimentally captured yet. However, there is a lack of understanding of the possible effects of nonlinear structural response, if any, on the wind-induced vibration of buildings. This study aims at numerically investigating the effects of nonlinear structural response on the aerodynamic feedback (e.g., damping) of tall buildings under extreme wind loads especially as the flexibility of the building increases. A multi-physics approach that couples computational fluid dynamic (CFD) along with structural dynamics and finite element simulation of low-rise, mid-rise, and high-rise buildings with aspect ratios of 1:1:2, 1:1:5, and 1:1:10, respectively, is employed. In this approach, the three-dimensional (3D) airflow around the buildings is simulated in ANSYS/Fluent, and the building dynamics are modeled in OpenSEES. The interaction between the two processes is achieved using an iterative procedure proposed by the authors. Both linear and nonlinear models of buildings with different dynamic characteristics are investigated. The results from the coupled simulations for both building models are compared to examine the effect that the nonlinear FSI might have on the overall response of the structure and induced wind forces.

In her second talk, Dr. Ghaffary will discuss “Probabilistic Performance-based Assessment of Nonlinear Behavior of a 20-storymoment Resisting Frames under Design and Extreme Wind Loads.” Recent advancements in performance-based assessment and design of buildings subjected to wind loads call for the incorporation of uncertainties in both loading and structural simulations and demonstrate the need to better understand the nonlinear wind-induced response of buildings. Probabilistic analysis approaches are more commonly used for the incorporation of uncertainties but focus more on the wind loading side as opposed to incorporating detailed nonlinear models for the structures. In this study, the WE-UQ tool is used for incorporating uncertainties into a detailed 20-story 2D building frame OpenSEES model. The results are then utilized for probabilistic performance-based assessment of the building frame, which is performed in light of the new guidelines proposed by the ASCE pre-standard for performance-based wind design. The performance of the frame under higher wind speeds that would lead to yielding or collapse of the building is also assessed. The results obtained from the probabilistic simulations are compared with pure deterministic simulation outcomes to investigate the effects and necessity of adding uncertainties into the response prediction of the buildings subjected to wind loads.

Additionally, James R. Bailey, Ph.D., P.E., F. ASCE, Exponent senior managing engineer and office director, will attend.

Exponent is a proud sponsor of the 14th Americas Conference on Wind Engineering.

For more information, click here.