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Title
Finite element analysis of temperature induced stresses in single ply roofing membranes
Finite element analysis of temperature induced stresses in single ply roofing membranes
Date
0/1985
0/1985
Author(s)
Walter Rossiter
Walter Rossiter
Page(s)
195-208
195-208
Source
Elseview Science Publishers
Elseview Science Publishers
Keyword(s)
finite element analysis; mathematical modeling; membrane; roofing; single ply; stress
finite element analysis; mathematical modeling; membrane; roofing; single ply; stress
Abstract
A linear finite-element method of analysis was used to calculate stresses induced in a single ply roofing membrane by thermal gradients through the roof system. The roofing system in the analysis consisted of a totally adhered or loose-laild EPDM membrane, two layers of fibrous glass insulation board, and a metal deck. The roof was objected to 55C (100F) temperature differential. Induced membrane, stresses above insulation board gaps were found to be higher than at other membrane locations. For the adhered membrane, the results indicated that the temperature - induced membrane stresses were approximately 0.20 MPa (29 lbf/in sq) at membrane locations corresponding to gaps between insulation boards. For the loose-laid membrane, streses above insulation board gaps were about 0.12MPa (17 lbf/in sq). In both cases, the relativley low levled of induced stress were attributed to the low modulus of the membrane material.
A linear finite-element method of analysis was used to calculate stresses induced in a single ply roofing membrane by thermal gradients through the roof system. The roofing system in the analysis consisted of a totally adhered or loose-laild EPDM membrane, two layers of fibrous glass insulation board, and a metal deck. The roof was objected to 55C (100F) temperature differential. Induced membrane, stresses above insulation board gaps were found to be higher than at other membrane locations. For the adhered membrane, the results indicated that the temperature - induced membrane stresses were approximately 0.20 MPa (29 lbf/in sq) at membrane locations corresponding to gaps between insulation boards. For the loose-laid membrane, streses above insulation board gaps were about 0.12MPa (17 lbf/in sq). In both cases, the relativley low levled of induced stress were attributed to the low modulus of the membrane material.