Events Calendar

Civil Seminar

Date:
Tuesday, April 18, 2017
Time:
1:30 pm - 2:30 pm
Location:
Spencer Engineering Building (SEB)
Room: 1200
Cost:
Free

Bio:
Dr Ahmed Elshaer is currently working as a postdoc fellow at Western University. He got his PhD from Western University in Jan 2017. He got his B.Sc. and MSc from Cairo University. Dr Elshaer worked as a research and teaching assistant at Cairo University (2010-2013). • He also worked in two consulting firms and involved in more than 50 design projects. • Started his PhD in September (2013). • During the PhD, he published four journal papers (including Engineering structures and Journal of Wind Engineering) and seven peer-reviewed conference papers in addition to other submitted papers. 

Abstract:
Wind is the governing load case for majority of tall buildings, thus requiring a wind responsive design approach to control and assess wind-induced loads and responses. The building shape is one of the main parameters that affects the aerodynamics that creates a unique opportunity to control the wind load and consequently building cost without affecting the structural elements. Therefore, aerodynamic mitigation has triggered many researchers to investigate various building shapes that can be categorized into local (e.g. corners) and global mitigations (e.g. twisting). Majority of the previous studies compare different types of mitigations based on a single set of dimensions for each mitigation types. However, each mitigation can produce a wide range of aerodynamic performances by changing the dimensions. Th presentation speaks about developing an aerodynamic optimization procedure (AOP) to reduce the wind load by coupling Genetic Algorithm, Computational Fluid Dynamics (CFD) and an Artificial Neural Network surrogate model. The proposed procedure is adopted to optimize building corners (i.e. local) using three-dimensional CFD simulations of a two-dimensional turbulent flow. The AOP is then extended to examine global mitigations (i.e. twisting and opening) by conducting CFD simulations of three dimensional turbulent wind flow. The procedure is examined in single- and multi-objective optimization problems by comparing the aerodynamic performance of optimal shapes to less optimal ones. In general, the research accomplished provides an advancement in numerical climate responsive design techniques, which enhances the resiliency and sustainability of the urban built environment.

Bio:
Moustafa El-Sawy acquired his BSc in Civil and Environmental Engineering (2011-2015) at United Arab Emirates University (UAEU) in Alain, UAE. He also joined BECHTEL: Engineering, Construction & Project Management as an Intern for a total of 9 months during which he has worked on several projects such as the Riyadh Metro in Saudi Arabia. He started his MESc program at Western University in 2015 under the supervision of Dr. Hesham El Naggar.

Abstract:
Earthquakes continue to pose a threat on the safety of buildings. Recent earthquakes have highlighted the need for safe and efficient construction of earthquake resilient structures. Meanwhile, helical piles are gaining popularity as a foundation for existing and new structures due to the immense advantages over conventional pile alternatives. There is a huge knowledge gap when it comes to understand the behaviour of helical piles under seismic loads. The first phase of my research involves a Full-scale shaking table test performed in the Large High Performance Outdoor Shake Table (LLHPOST) on a total of ten steel piles with different configurations. The dynamic characteristics of different pile are determined and the effect of different loading intensity and frequency content on different piles is studied. The second phase includes constructing a 3D Model using ABAQUS and simulating the full-scale test performed earlier.  After the model is verified and calibrated, a full parametric study will be done.

Host:
Civil & Environmental Engineering
Contact:
Kristen Edwards
civilgrad@uwo.ca
Event Type:


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