Study On Wind Load Characteristics Of Dry Coal Shed With Double-span Three-core Cylindrical

With the strict enforcement of environmental policies in recent years,the structure of both ends of the dry coal shed wall is also gradually transformed from colorful steel plates to wind and dust suppression nets,and the structure form has changed,making the surface wind load of coal shed structure change.At the same time,in order to meet the demand of large amount of coal storage in power plants,the actual project often adopts the structural form of multiple coal sheds and power generation facilities arranged in close proximity,and the mutual interference between the structures also brings a lot of uncertainty to the estimation of wind load on the surface of coal sheds.At present,the research results on wind resistance of column-faced dry coal sheds mainly focus on closed and open single-span column-faced dry coal sheds,and it is very necessary to take it as the research object when there is less research on double-span three-center column-faced dry coal sheds which are closed with 30% porosity windproof dust suppression nets at both ends of the mountain walls.In this paper,the wind load characteristics of a double-span three-center cylindrical surface dry coal shed,which is closed with 30% porosity windproof dust suppression net at both ends of the mountain wall of a power plant,are studied by using rigid model pressure measurement wind tunnel test method,and the wind vibration response analysis method is also used to calculate the wind vibration response of the coal shed structure under the most unfavorable wind direction in order to more accurately design the main body and enclosure of the coal shed.Finally,combined with the results of wind tunnel pressure test and wind vibration response analysis,the proposed values of wind load for the design of coal shed main body and enclosure structure are given.The main research contents of this paper are as follows.(1)Based on the rigid model wind tunnel pressure test of single-body coal shed,we analyzed the variation law of axial wind force coefficient,average wind pressure coefficient,pulsating wind pressure coefficient and body shape coefficient with wind direction angle,and found that the most unfavorable wind direction angle under the working condition of single-body coal shed is 40°,and there are large pulsating wind suction force near the windward corner of roof cover and top skylight under 40° wind direction angle.(2)Based on the wind tunnel test of rigid model of double-body coal shed,the influence of interference effect of adjacent coal shed on the axial wind force coefficient,average wind pressure coefficient,pulsating wind pressure coefficient and body shape coefficient was studied and analyzed,and it was found that: the interference effect between adjacent coal shed is mainly manifested as "shading effect" and "narrow tube effect ".The "shading effect" is most significant under 40°wind angle,which can reduce the overall average wind load by about 28%.(3)Based on the rigid model pressure measurement wind tunnel test of the peripheral building conditions(CS1 and CS2),the effect of the peripheral building interference effect on wind load,and it was found that: the peripheral building interference effect is most significant at 270° wind angle,and from the perspective of the overall combined wind force coefficient,the peripheral building interference effect reduces the overall average wind load by about 47% average wind load.(4)Based on the pulsating wind load obtained from the rigid model pressure test,the structural wind vibration response analysis was carried out to obtain the extreme wind vibration response and the equivalent static wind load of the coal shed structure,and the wind load values of the main body and the enclosure structure were suggested.