Experimental investigations on Structural Behaviour of Two-layer-stacked ETFE film Square Planar Structure Under Normal Pressure Loading
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ETFE foil features unique architectural physics and mechanics properties, and has been widely used over the world. Thickness of ETFE film is usually 150-250m, this will realize the better trade-off performance, including manufacture procedure, mechanical behaviour, film production, etc[1-3]. Since diverse application condition, such as fairly large span of membrane, heavy snow, strong wind, the membrane structure composed of ETFE foil single layer could not meet structural performance. Even some supplier could produce bigger thickness foil up to 500m, as proved difficulty manufacture of welding and packaging. Two-layer-stacked ETFE film instead of single layer was proposed and adopted in some large engineering projects[2-3]. Two-layer-stacked ETFE film is composed of two identical layers of different thickness pilled up to provide large loading capacity, and designed from rare empirical engineering knowledge. However, there are no solid research published yet. This paper will firstly report the preliminary experimental results of two-layer-stacked ETFE film square planar structure under normal pressure loading. Firstly, the two-layer-stacked ETFE film conception and application are outlined. Secondly, series experiments have been designed and performed on two-layer-stacked ETFE film square planar structure under normal pressure loading. Finally, the preliminarily analysis of experimental results are summarized. The present research will add the knowledge of understanding the structural behaviour of two-layer-stacked ETFE film, and extend engineering application of ETFE membrane structures.
