The Research On The Wind-resistance Of Coastal Rural Buildings Based On Innovative Rotary Damper

In numerous natural disasters,the typhoon has an extremely wide influential range,along with high frequency and serious secondary disasters,so it often leads to huge threat to people's life and property.In China's coastal areas,where suffer from typhoon disasters frequently,for example Fujian,Zhejiang and Guangzhou provinces,the typhoons and hurricanes will cause enormous destruction of a large number of buildings and structures on their landing,especially the low-rise buildings without engineering design and good maintenance in villages and towns.By further investigation,it was found that the destruction of low-rise gable roofed buildings generally began with the local roof failure,then leading to the breakdown of other parts,and even the collapse of overall building.Therefore,as for improving and enhancing the wind resistance ability of low-rise gable-roofed buildings,the main problem to be solved is that taking measures to reduce and eliminate the wind load of low-rise building structures,especially the roof systems.Based on the innovative rotary damper of coastal rural buildings in windresistance,this work has done the research in detail by field investigations,wind tunnel experiments and CFD numerical simulation.The main contents are as follows:1.In August 2015,in order to have a thorough understanding of the typhoon disaster situation of rural houses in coastal areas,our research group conducted the field investigations on Fujian province after the landing of typhoon “soudelor”.Through the investigations and researches,the damage situation and failure mechanism of the buildings were summarized and analyzed.2.A new method to improve the wind resistance performance of gable roofs was put forward according to the present situation and existing problems on this research topic at home and abroad,at the same time combining the field survey results,namely the wind-resistant energy dissipation devices were installed on roofs.Meanwhile,the solid model of the windresistant energy dissipation device was preliminary designed and applied for a patent.3.In wind tunnel laboratory,rigid model pressure tests on typical low-rise gable roofed buildings in villages and towns were carried to study the effect of innovative wind-resistant energy dissipation device on wind load of the roofs in depth.By comparing the wind pressure distribution and variation on roofs under different working conditions(with/without windresistant energy dissipation device and only with vertical parapets),the influence rules of windresistant energy dissipation device on wind load of the roofs we obtained.Finally,positive effect of the wind-resistant energy dissipation device on roof wind-resistance was summarized.4.Reynolds stress RSM turbulence model was adopted to simulate the low-rise gable roofed building under different wind angles(0°,60° and 90°).The results of numerical simulation and wind tunnel test were almost consistent by comparison and verification.On this basis,numerical simulation research has been carried on the wind-resistant dampers and the low-rise buildings,and some valuable conclusions has been obtained.Then the variations of mean wind pressure coefficients of different roof areas with different roof pitches(15°,25°,30°,35°,and 45°)were simulated.Meanwhile,the low-rise gable roofed buildings were simulated under two working conditions(with/without vertical parapets),and the mean wind pressure coefficients and the velocity vectors diagrams of vertical profiles were compared and analyzed.The results verified the accuracy of the wind tunnel experimental conclusions.Finally,the conclusions are summarized in this paper.