The Analysis And Study Of The Temperature Stress And Dynamic Respond Affected By Shock Load Of Steel-Fiber Reinforced ConcretePavement Plank Structure

The Steel-Fibre Reinforced concrete(SFRC)is a new kind of multiply-composite material,and the short steel fibres are distributed disorderly in the concrete.The main function of the short steel fibres is to hinder the expandance of inner microscopic and macroscopic cracks in the concrete.Therefore,SFRC is used extensively in building highway and airport pavement.With the extensive applyment of SFRC,the experiment and research of it has been concerned and valued by the scholars of internal and overseas.Now,the scholars of internal and overseas pay close attention to the mechanics function of SFRC,such as in the References[3,13,14,16,23,27,28,29],and so on.However,in the practice pavement engineering project,the SFRC is given not only the effect of vehicle and shock load,but also the effect of the temperature changes and sun radiation.Therefore,the temperature and load stress are the main factor of the damage of the rigid pavement structure.Because of the existent of the temperature stress,the SFRC pavement structure may be destroyed by the expand of crack.Therefore,the research and analysis of the temperature load and stress of SFRC pavement structure are important to control the crack of SFRC pavement structure.In this paper,firstly according to Fourier heat conduct ~quation,the analysical solutions of the temperature field of SFRC pavement structure were obtained and the finite element solutions were soluted by means of Galerkin weighed residual methoded.Secondly,based on the temperature field ,the analysical solutions of the temperature stress of SFRC pavement structure were dissolved with Westerguard-Bradbury method,and then the finite element solutions were obtained by means of the finite element method .At last, the dynamic response of SFRC pavement plant structure affected by shock load with the finite element method was studied,and the deflection and stress response under shock load was calculated.The obtained results has been shown that the temperature field of SFRC pavement structure is non-linearly distributed along its thickness .The temperature which is close to the surface changes quickly ,whereas slowly which is far .Under the affect of temperature field,the temperture stress of SFRC pavement structure is also distributed non-linearly .The deflection and stress responses of SFRC pavement structure are waved declingly under the effect of shock load.