Mechanical Analysis Of Continuously Reinforced Concrete With PU Of Airfield Pavement

Continuously reinforced concrete with PU of pavement (CRCP) structure will beone of new structures used in highway and airport pavement's repairs in the future. Itexploits to the fully reinforcing bars and PU concrete's favorable conditions andavoids unfavorable ones, which take advantage of materials. In CRCP, thelongitudinal reinforcing steel is continuous throughout its length and it has nointermediate transverse expansion or contraction joints. CRCP has many advantages,such as higher strength of whole pavement, longer service life, less maintenance workand so on, and concrete with PU is a new building material, it can reach 70 percent ofits final strength within 5~8 hours, CRCP had been widely used for the main line ofhighway and airport pavement in United States and European countries. Somepreliminary application has also been taken in our country. But the theoretical studyand construction technology is not perfect, especially, dynamic analysis of CRCPsubjected to moving loads has not been discussed.Based on the theory of composite materials and the structural characteristics ofCRCP, CRCP is treated as laminated composite plates, and the engineering elasticconstants of CRCP are elaborated, further more, the governing differential equationsof CRCP were all established for the analysis of static and dynamic behaviors inCRCP. The influence laws of loads position and foundation coefficient on thedeformation were studied with numerical methods. The response of displacement andstress under moving loads was compared with static loads. In this paper, the responselaws of the CRCP , about stress and strain of different layers and notes, was studied.To make an exploratory analysis on the response regularity of aerodromepavement in case of parametric variation, aiming to the aerodrome pavement surfacelayered system under the dynamic plane loads, set up the finite element model and usethe ANSYS software to simulate and analyze. The analysis indicated that thedisadvantage load-bearing position is the status when load is on plate edges. Soilsubgrade modulus of resilience is also an important influencing factor on bearingcapacity of pavement. The moving loads lead to a larger response value of thedisplacement compared with the static loads, but to a slightly amplify value of thestress.Under moving load, the dynamic analysis of CRCP indicated that the maximumvertical displacement and stress occurred at surface nodes(of finite element model),combining site is weak area, and is easy to crack;Alternate horizontal stress andtransverse stress are the main reason of cracking. The plastic strain occurs mainly atnodes of the middle facing part. The vertical plastic strain is the maximum and isalmost twice as the horizontal and transverse plastic strain, and horizontal plasticstrain is the minimum.