Research On The Radiation Temperature Field And Shielding Effect Of Concrete Structure

Concrete structure will produce nonlinear temperat ur e distribution inside the st ructure under the influence of s olar radiation and the surrounding environment. The temper ature stress and displa cement has become one of the i mportant reasons of cracks, bre akage of concrete s tructures in the natural environment. In this paper, the temper ature effect on the c oncret e st ructure wil l be studied. The effect of the sol ar radiation intensity, surrounding envi ronment and the calculation theory and method will al so be anal yzed and di scussed.Fir stly, a ccordi ng to the basic knowledge of solar physics and As tronomy a nd heat transfer, we analyze the mec hanism of e nergy transfer between the concrete st ructure and the surroundi ng environment. Accordi ng to the Four ier 's heat t ransfer law of heat conduction, heat conduct ion differe ntia l equation of three-dimensiona l is derived fr om the tra nsient and steady state. At last we give a detailed finite element method deri vati on process about the concret e st ructure of the steady a nd t rans ient temper ature fi eld.According to the boundary conditions of the t emperature field of concrete st ructure, the process of t he basic principle of solar radiation a nd relative parameters is introduced in de tai l. Based on the s imple and convenient principle, a si mplified semi sine function was used to simul ate t he solar radiation, and t hen carrying out on the trigonometr ic series of the Fourier 's law.The mai n parameters i n the process of sol ar radiation a r e analyze d es pecially. Through the study of these parameter s, the adverse t emperature stress of t he concrete struct ure caused by solar radiation ca n be avoided in theory.The solar radiation shielding e ffect i s existenced on the surface of conc r ete st ructure due to the surrounding environment.The varia tion of the intensity and flux of sol ar radiation about the hor izont al, vertical and inclined sur face of concr ete are analyzed in deta il under the cove r of the surrounding environment. At last t he for mula of t he intensi ty of solar radiation about three conditions is deduced and the corresponding paramete rs ar e also a nalyzed in detail.Finally, a concret e slab is used to as an example, and the finit e element model is set up by ANSYS software. The curve of temperat ure under the sunshine in di fferent seasons about concrete structure is simulated through the thermal t ransient function.The distribution of the temper ature field about concrete structure can be si mulated by the ANSYS pr ogram. The comput ational model and the for mat ion of the finite element module ar e suitable, havi ng a c erta in reference signifi canc e to the actual projec t.