Aerodynamic analysis of pentagon-shaped tall buildings
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ORIGINAL PAPER
Aerodynamic analysis of pentagon‑shaped tall buildings Najah Assainar1 · Sujit Kumar Dalui1 Received: 25 May 2020 / Accepted: 3 August 2020 © Springer Nature Switzerland AG 2020
Abstract Tall buildings are highly susceptible to wind loads. Hence wind loads have to be properly assessed in design of tall buildings. Aerodynamic modifications are very useful tools in mitigating wind loads. The purpose of this research is to study the efficiency of aerodynamic modifications applied on a pentagonal-plan shaped model by computational fluid dynamic (CFD) simulation using the software package ANSYS CFX. Corner modifications like chamfered, recessed, rounded and aerodynamic forms like setback and tapering are taken into study. Coefficients of force and pressure as well as the dynamic behaviour of the models are used to study the efficiency. The study revealed that the chamfered model is the most efficient corner modification in mitigating wind loads in terms of pressure and force coefficients, as well as showing excellent dynamic performance. The study also revealed that tapered model was better in reducing pressure and force coefficients during static analysis among aerodynamic forms. The dynamic analysis also showed similar pattern except for peak frequency, for which setback model was best. Keywords Tall building · CFD · Pentagon · Aerodynamic modifications · Pressure coefficient · Force coefficient · Power spectral density
Introduction Wind load plays a significant role in the design of tall buildings. Irwin (2009) discussed the various new wind engineering challenges in designing the new generation of tall buildings. Wind is sometimes even more critical than earthquake loads, as taller buildings are more vulnerable to wind forces. Thus, wind engineering is considered to be of utmost importance in the field of structural engineering. There are different standard codes available around for the world for the wind design of structures. Kijewski and Kareem (1998) and Kwon and Kareem (2013) provided a comparative study of the major international wind codes and standards for wind effect on tall buildings. However, none of them covers all the aspects of design (Mendis et al. 2014). Thus research studies have been conducted extensively to study the effect * Najah Assainar [email protected]; [email protected] 1
Sujit Kumar Dalui [email protected]; [email protected]
Department of Civil Engineering, Indian Institute of Engineering Science and Technology, Shibpur, Howrah 711103, India
of wind loads on different structures, both experimentally and analytically. Experimental studies are conducted using wind tunnel tests and analytical studies by computational fluid dynamics (CFD). Masera et al. (2015) presented two case studies on the New Marina Casablanca Tower in Casablanca, Morocco and the Al-Hamra Tower in Kuwait City, Kuwait. The research presented results of the wind tunnel tests conducted on the Al-Hamra Tower and CFD analysis done on the former. Gunawardena et al.
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