Opterećenje vjetrom na visokim zgradama s poroznim dvostrukim pročeljima

master's thesis

• Title (english): Wind loads on tall buildings with porous double-skin façades
• Author: Petar Melnjak
• Mentor: Hrvoje Kozmar (mentor)
• Mentor: Gianni Bartoli (komentor); VIAF: 78208513
• Committee member: Hrvoje Jasak (predsjednik povjerenstva)
• Committee member: Vladimir Soldo (član povjerenstva)
• Committee member: Zvonimir Guzović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-04-01, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; Precision Mechanical Engineering

Abstract

Primjena sustava poroznog dvostrukog pročelja (PDP) je česta u izgradnji zgrada s visokom
energetskom učikovitosti. PDP sustav se sastoji od unutarnjeg nepropusnog pročelja i
vanjskog propusnog pročelja. Mali razmak između dvaju pročelja omogućuje vjetru da struji
između njih. U sklopu ovog rada su proučavana aerodinamička svojstva zgrada opremljenih
PDP sustavima različitih poroznosti, pri čemu su zgrade smještene u urbanom okruženju.
Eksperimenti su provedeni u zračnom tunelu za generiranje modela atmosferskog graničnog
sloja u istraživačkom centru za aerodinamiku zgrada i inženjerstvo vjetra (CRIACIV) na
Sveučilištu u Firenci, Italija. Značajke strujanja su određene korištenjem Pitotovih cijevi i
užarene žice. Aerodionamička opterećenja i površinski tlak na modelu zgrade su izmjereni
visokofrekventnom vagom i osjetnicima tlaka na unutarnjem nepropusnom pročelju modela
zgrade. Pokazano je da PDP sustav na zgradi u urbanom okruženju ne utječe na
aerodinamičke koeficijente momenta poprečno i uzduž smjera strujanja, dok s druge strane
ima negativan učinak na spektralnu gustoću pulzacija aerodinamičkog momenta u poprečnom
smjeru s obzirom na smjer strujanja vjetra, jer su vršne vrijednosti uvećane. PDP sustav
uzorkuje smanjenje srednjih i vršnih vrijednosti koeficijenta tlaka na cijeloj površini zgrade
kao i standardne devijacije pulzacija površinskog tlaka.

Abstract (english)

Porous double-skin façade (PDSF) systems have become common in high-performance
buildings. A PDSF system consists of an inner impermeable façade and an outer permeable
façade. A small gap between the two skins enables the wind flow. The aerodynamic
characteristics of buildings equipped with PDSF systems of various porosities were studied in
an urban environment. Experiments were conducted in a boundary layer wind tunnel
(BLWT) at the Inter-University Research Centre on Building Aerodynamics and Wind
Engineering (CRIACIV) at the University of Florence, Italy. Flow characteristics were
determined using Pitot tubes and hot-wire anemometry system. Aerodynamic loads and
surface pressures acting on the building model were measured using a high-frequency force
balance (HFFB) and pressure taps on the inner skin of the building model, respectively. The
results indicate that the PDSF system on a building in an urban environment does not affect
the across-wind and along-wind moment coefficients, while the PDSF system exhibits a
slightly negative effect on the power spectral density of the across-wind moment because the
peak values are greater. Furthermore, the PDSF system proved to diminish the mean pressure
coefficient peak and mean values on all building surfaces as well as the standard deviation of
surface pressure fluctuations.

• Keywords: inženjerstvo vjetra; aerodinamika; visoke zgrade; porozna pročelja; zračni tunel; atmosferski granični sloj; aerodinamička opterečenja; površinski tlak; urbano okruženje
• Keywords (english): wind engineering; aerodynamics; tall buildings; porous façades; wind tunnel; atmospheric boundary layer; aerodynamic loads; surface pressure; urban environment
• Language: english
• URN:NBN: urn:nbn:hr:235:126568
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access; Embargo expiration date: 2024-04-05
• Created on: 2022-04-05 10:50:57