Performance Research Of Quickly Assembling Pavement Structure Of Steel Frame-Prestressed Concrete

Assembled pavement is a special kind of pavement structures, it has a wide range of applications in the temporary traffic demands of the road rebuilding projects, emergency rescue and disaster relief, airport expansion projects and the military field airport. It also has a variety of materials and structures.This topic is based on the temporary traffic demands of airport and road extension, it needs to built temporary pavements in the medium-low foundation supporting to meet the aircraft or vehicles traveling on the pavement and satisfy the construction convenience of the rapidly paving and dismantling. This article analyses the adaptability and reliability of the quickly assembling pavement structure of steel frame-prestressed concrete based on the characteristics of prestressed concrete and steel reinforced composite structure. Based on the mechanical characteristics of the quickly assembling pavement structure system of steel frame-prestressed concrete, it discusses the stress-strain model and mechanical response of the pavement structure. By using the finite element numerical simulation method, it analyzes the stress-strain distribution law of the composite pavement structure on the different supporting basis and under different aircraft loading and loading positions. It conducts the laboratory tests of the quickly assembling pavement structure of steel frame-prestressed concrete through using the small scaled model and researches the mechanical stress and deformation laws of pavement structure under different loads.Finite element numerical analysis and small scaled model experiment results show that,10 cm plate thickness of the quickly assembling pavement structure of steel frame-prestressed concrete can satisfy the using requirements of the A320 and following types when the foundation reaction modulus is 70MN/m3, The plate thickness should be more than 14 cm when B737-800 aircraft traveling on the pavement. The foundation reaction modulus K varies from 5 to 80MN/m3, the bottom plate deformation is remarkable and it almost has no effect on the decreasing of bottom plate stress. Thickness variation has a significant effect on bottom plate stress, When the plate thickness increased to 14 cm, plate thickness increasing has little influence on the bottom plate deformation. The two-ways 3×3 reinforcement arrangement can satisfy the performance requirements for the plate of thickness of 12 cm and length of 100 cm,the appropriate reinforcement location is the position from the plate top 4~5cm. For the multi-plates pavement structure, connections between the frames should adopt articulated form. The connection position is closed to the bottom plate, the loading diffusion effects of the multi-plates pavement is more significant. The concrete plate local stress concentration mainly exists in the contact position between the frames and the concrete plate; the steel frame which has no articulated connections cannot directly spread the stress to adjacent plates,causing the stress concentration in the concrete plate.