Wind loads on roofing system and photovoltaic system nstalled parallel to flat roof

Tetsuo Yambe, Yasushi Uematsu, Kosuke Sato

Research output: Contribution to conferencePaperpeer-review

Abstract

Mechanically-Attached waterproofing system has become popular in Japan. Being vulnerable to wind actions, especially to suctions, this roofing system is often damaged by strong winds. Similarly, photovoltaic (PV) systems installed on flat roofs are often damaged by strong winds, because the PV panels are subjected to large wind forces in an adverse wind. In order to reduce such damage to both systems, the authors propose to install the PV panels parallel to the flat roof with gaps between them, which may reduce the net wind forces on the PV panels due to the effect of pressure equalization. In addition, the wind pressures acting on the waterproofing system will decrease significantly. The present paper investigates the validity of the above-mentioned idea. The wind pressures underneath the PV panels, called layer pressures , are evaluated by a numerical simulation using the unsteady Bernoulli equation together with the time history of external pressures measured at many locations on the rooftop of a flat-roofed building model in a turbulent boundary layer. The results clearly indicate a significant reduction of wind forces acting on the PV panels as well as on the waterproofing system. The use of PV panels for reducing the wind pressures on waterproofing system is quite effective to the corner region of the roof, where very large suctions are induced in a diagonal wind.

Original languageEnglish
Publication statusPublished - 2020
Event3rd European and Mediterranean Structural Engineering and Construction Conference 2020, Euro-Med-Sec 2020 - Limassol, Cyprus
Duration: 2020 Aug 32020 Aug 8

Conference

Conference3rd European and Mediterranean Structural Engineering and Construction Conference 2020, Euro-Med-Sec 2020
Country/TerritoryCyprus
CityLimassol
Period20/8/320/8/8

Keywords

  • Mechanically-Attached waterproofing system
  • Numerical simulation
  • Pressure equalization
  • Unsteady Bernoulli equation
  • Wind tunnel experiment

ASJC Scopus subject areas

  • Building and Construction
  • Civil and Structural Engineering

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