Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Textile membranes are more and more often used to cover permanent architectural structures. As durability is one of their essential characteristics there is a need for evaluation methods of their performance over time. A damage evaluation method is presented which is based on a statistical analysis of the state of membranes used on all sorts of sites over the French territory (cities, plains, forests, seaside) and in various environments. Globally, the period of analysis extends over 30 years. In the approach offered, the damage of a membrane under the effects of a combination of degradation agents is the sum of the damages developing under static mechanical tension and under dynamic mechanical stresses. It has been found that a number of membranes in use under low or nearly nil mechanical tension have only lost 25 % of their mechanical performance after twenty-five to thirty years of existence in low pollution areas. Membranes used under high pre-tensions, however, have lost half of their mechanical performance after only ten to thirteen years. From the statistical data membrane durability curves according to the applied Safety Coefficient, the level of initial pretensioning and the pollution level can be derived. This is demonstrated by the example of a polyester PVC-coated membrane without soil-repellent finish. The number of data available at present allows the prediction of membran durability with a precision of 12 %. (Bilingual document: English/French)
Textile membranes are more and more often used to cover permanent architectural structures. As durability is one of their essential characteristics there is a need for evaluation methods of their performance over time. A damage evaluation method is presented which is based on a statistical analysis of the state of membranes used on all sorts of sites over the French territory (cities, plains, forests, seaside) and in various environments. Globally, the period of analysis extends over 30 years. In the approach offered, the damage of a membrane under the effects of a combination of degradation agents is the sum of the damages developing under static mechanical tension and under dynamic mechanical stresses. It has been found that a number of membranes in use under low or nearly nil mechanical tension have only lost 25 % of their mechanical performance after twenty-five to thirty years of existence in low pollution areas. Membranes used under high pre-tensions, however, have lost half of their mechanical performance after only ten to thirteen years. From the statistical data membrane durability curves according to the applied Safety Coefficient, the level of initial pretensioning and the pollution level can be derived. This is demonstrated by the example of a polyester PVC-coated membrane without soil-repellent finish. The number of data available at present allows the prediction of membran durability with a precision of 12 %. (Bilingual document: English/French)
Durabilite des membranes polyester
Dauerhaftigkeit von Polyestermembranen
Baegert, R.J. (Autor:in)
TUT Textiles a Usages Techniques ; 22-26
1998
4 Seiten, 4 Bilder
Aufsatz (Zeitschrift)
Englisch , Französisch
Quelle Durabilite attendre des betons
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