Stress Response of RC-HDC Composite Airport Pavement Structure
Due to the low flexural and tensile strength,poor toughness,and susceptibility to cracking of regular cement concrete(RC),it is prone to diseases such as broken boards,voids,and cracks when used on airport pavement;High ductility concrete(HDC)has high strength,toughness,and crack resistance.therefore a new type of ordinary con-crete high ductility concrete(RC-HDC)composite airport pavement structure is proposed.Three types of airport pavement structures were designed including RC single-layer plate,HDC single-layer plate,and RC-HDC com-posite plate.Considering base support,joint load transfer capacity and complex landing gear,a 3D rigid pavement finite element model was established to analyze the stress responses of the airport pavements under different aircraft loads,airport pavement structure types,plate thicknesses,base thicknesses,base modulus and soil reaction modu-lus.The minimum design thickness of airport pavement plate was calculated under different airfield area classes.The results indicate that the flexural strength of the HDC single-layer plate and RC-HDC composite plate was 20 MPa and 18 MPa,which are 4 times and 3.6 times that of the RC single-layer plate,respectively;RC-HDC composite plate had the advantages of high flexural strength of HDC and high flexural modulus of RC;For the same airport pavement structure,the stress is the largest under the load of single-axle with single-wheel landing gear,and one is the smallest stress on the airport pavement under the load of double-axle with double-wheel landing gear;Under the airfield area classes of 4C,4D,4E and 4F,the minimum required design thickness of RC-HDC composite plate are 38.6％,39.0％,39.9％,and 41.5％of the RC single-layer plate,respectively.RC-HDC composite plate can not only significantly decrease the airport pavement thickness,but also has better economic benefit.
airport engineeringregular concrete(RC)high ductility concrete(HDC)composite airport pave-mentfinite element simulation
国家科技期刊平台
NSTL
万方数据
维普
