Behavior of a mechanically anchored waterproofing membrane system under wind suction and uniform Pressure

Miyauchi, Hiroyuki; Katou, Nobuo; Tanaka, Kyoji

doi:10.1016/j.buildenv.2010.11.005

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…It was found that horizontal forces nearly equal to or larger than the vertical ones were generated on the fasteners when the PV panels were not installed. This feature corresponds well to the findings of Miyauchi et al [9,10] and Sugiyama et al [11]. When the PV panels were installed, the values of F V and F H were reduced significantly, except for F H at A-1.…”

Section: Resultssupporting

confidence: 91%

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The Benefit of Horizontal Photovoltaic Panels in Reducing Wind Loads on a Membrane Roofing System on a Flat Roof

Uematsu

Yambe

Watanabe³

et al. 2021

Wind

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The present paper proposes a measure for improving the wind-resistant performance of photovoltaic systems and mechanically attached single-ply membrane roofing systems installed on flat roofs by combining them together. Mechanically attached single-ply membrane roofing systems are often used in Japan. These roofing systems are often damaged by strong winds, because they are very sensitive to wind action. Recently, photovoltaic (PV) systems placed on flat roofs have become popular. They are also often damaged by strong winds directed onto the underside, which cause large wind forces onto the PV panels. For improving the wind resistance of these systems, we proposed to install PV panels horizontally with gaps between them. Such an installation may decrease the wind forces on the PV panels due to the pressure equalization effect as well as on the waterproofing membrane due to the shielding effect of the PV panels. This paper discusses the validity of such an idea. The pressure on the bottom surface of a PV panel, called the “layer pressure” here, was evaluated by a numerical simulation based on the unsteady Bernoulli equation. In the simulation, the time history of the external pressure coefficients, measured at many points on the roof in a wind tunnel, was employed. It was found that the wind forces, both on the PV panels and on the roofing system, were significantly reduced. The reduction was large near the roof’s corner, where large suction pressures were induced in oblique winds. Thus, the proposed method improved the wind resistance of both systems significantly.

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Section: Resultssupporting

confidence: 91%

“…They found that fasteners located near the windward corner were subjected to horizontal forces as large as vertical ones. Then, they carried out a pressure test and a wind tunnel test using a full-scale roofing assembly [10]. In the pressure test, uniform pressure was applied to the bottom surface of the membrane.…”

Section: Introductionmentioning

confidence: 99%

The Benefit of Horizontal Photovoltaic Panels in Reducing Wind Loads on a Membrane Roofing System on a Flat Roof

Uematsu

Yambe

Watanabe³

et al. 2021

Wind

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“…Following significant damage to waterproofing systems caused by strong winds of Typhoon No. 18 of 2004 in Japan, Miyauchi et al [30], [31] carried out extensive research on the wind-induced behavior and wind-resistant performance of mechanically attached single-ply membrane roofing systems. First, they carried out a field measurement of wind pressures and wind-induced responses (membrane deformations and fastener loads) of a roofing system installed on a full-scale flat-roofed test building without parapets, 6 m long, 6 m wide, and 3 m high, during a typhoon.…”

Section: Figure 2 Deformation Of Waterproofing Membrane and Forces Acting On The Fastenermentioning

confidence: 99%

Wind-Induced Dynamic Behavior of Mechanically Attached Single-Ply Membrane Roofing Systems Installed on Flat Roofs

Uematsu

Sugiyama

Usukura

2021

Engineering Science & Technology

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The present paper investigates the wind-induced dynamic behavior of a mechanically attached single-ply membrane roofing system installed on flat roofs of middle-rise and high-rise buildings with or without parapets. First, the wind pressure distributions on the roof were measured in a turbulent boundary layer. The results indicate that the parapets affect the wind pressure distributions significantly. Very large peak suctions are induced near the windward corner of the roof in an oblique wind in the case of a building without parapets. Then, we have developed a test method for evaluating the wind-resistant performance of the roofing system using three Pressure Loading Actuators (PLAs) and a chamber to which a full-scale specimen is attached. In the experiments, the chamber was divided into three spaces by using thin silicon sheets. The PLAs generated different fluctuating pressures in these spaces using the time history of wind pressure coefficients measured at three points near the windward corner of the roof in an oblique wind. We measured the membrane deformations and the wind forces acting on the fasteners connecting the membrane with the structural substrate. The results indicate that horizontal forces nearly equal to or larger than the vertical ones are generated on the fasteners, which may cause pulling out of fasters more easily. The failure mode was found to be different from that obtained from a ramped pressure loading test. We have also developed a model of finite element analysis, which was validated by an experiment. The results of analysis for a wide area of roofing system indicate that relatively large horizontal forces may be generated on the fasteners in the field region of the roof for buildings with parapets.

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“…It includes many others, such as solar radiation (UV radiation) (20), high temperatures, freezethaw cycles, water (13), hail (21,22), oxidation processes, etc. Even wind can sometimes compromise the integrity of a waterproofing membrane (23,24). In addition, regardless of the position of a waterproofing membrane (exposed to the elements, protected with covering layers, in the presence of oxygen or not, etc.…”

Section: State Of the Artmentioning

confidence: 99%

Comparative scanning electron microscope study of the degradation of a plasticized polyvinyl chloride waterproofing membrane in different conditions

Pedrosa

Rı́o

2017

Mater. construcc.

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This paper discusses the analysis of several samples of a plasticized polyvinyl chloride (PVC-P) waterproofing membrane. The samples were extracted from different areas of the same flat roof, which was in service for over 12 years. An original sample of an identical PVC-P membrane that was not installed on the roof was also analyzed. The analysis of the materials was carried out using a scanning electron microscope (SEM). An elemental analysis of every sample was also performed by energy dispersive X-ray spectroscopy (EDS). Micrographs and the elemental composition of the samples were compared with the data obtained in the analysis of the original sample. The results show dehydrochlorination of the polymer in two of the samples studied and great deterioration that was not visible to the naked eye in the sample that was totally exposed to the weather.

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Behavior of a mechanically anchored waterproofing membrane system under wind suction and uniform Pressure

Cited by 17 publications

References 3 publications

The Benefit of Horizontal Photovoltaic Panels in Reducing Wind Loads on a Membrane Roofing System on a Flat Roof

The Benefit of Horizontal Photovoltaic Panels in Reducing Wind Loads on a Membrane Roofing System on a Flat Roof

Wind-Induced Dynamic Behavior of Mechanically Attached Single-Ply Membrane Roofing Systems Installed on Flat Roofs

Comparative scanning electron microscope study of the degradation of a plasticized polyvinyl chloride waterproofing membrane in different conditions

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