Wind Resistance Evaluation to Dynamic Response of Mechanically Anchored Waterproofing Membrane System

Abstract

Damages of mechanically-anchored waterproofing membrane system from strong wind have been occurring. Thus, this study provides investigation on the behavior of waterproofing sheets and fasteners exposed during typhoon, and the difference between the static pressure test and typhoon test. The polyvinyl chloride waterproofing membrane reinforced with polyester fiber was constructed on a flat roof with dimensions of 6 m by 6 m on the island of Miyako in Japan. At first, a pressure test was carried out by using a compressor. Afterwards, the response of waterproofing membrane system located atop a building when subjected to strong winds from a typhoon in 2009 was measured. Both axial force and lateral force of mechanically-anchored waterproofing membrane system were measured under high speed wind, and lateral force was significantly large. It is presumed that such lateral force causes waterproof membrane damage that ripped the sheet in the lateral direction as if in a typhoon. Next, this study provided the proposal of simple wind resistance test method for mechanically anchored waterproofing membrane system. At first, the pressure test on the flat roof of actual building was carried out to obtain basic data for wind resistance design of this system. As a result, Fastener’s force of waterproofing membrane was equivalent to the wind force. Then, the ring type specimen with 200 and 600 mm diameter was made, and the fatigue coefficient of this system after using 10 years was calculated by using the tension test and the SIGDERS test. Finally, the design method for fastener based on fatigue model was proposed in order to apply to construction system.KeywordsWaterproofing membraneWind resistanceField testTest methodFatigue