Papers by Author: Man Ding

Abstract: This study concerns the experimental and numerical researches on the temperature field of CFST which is subjected to periodic solar radiation and ambient temperature. The study gives the detailed temperature and heat flux which vary with time, and the results indicate that temperature distribution caused by solar radiation is nonlinear, and is significantly varied with time and sections. The peak temperature of measure points in the surface of steel tube and in the center of concrete occur at different times, the largest temperature difference is over26.3°C. The variations of temperature lag obviously when the measuring points are more close to center in the same series. And the temperature of the center point is affected by various directions, especially the strongest direction.

Abstract: Normal thermal conductivity of amorphous and crystalline SiO₂ nano-films is calculated by nonequilibrium molecular dynamics (NEMD) simulations in the temperature range from 100 to 700K and thicknesses from 2 to 6nm. The calculated temperature and thickness dependences of thermal conductivity are in good agreement with previous literatures. In the same thickness, higher thermal conductivity is obtained for crystalline SiO₂ nano-films. And more importantly, for amorphous SiO₂ nano-films, thickness can be any direction of x, y, z-axis without effect on the normal thermal conductivity, for crystalline SiO₂ nano-films, the different thickness directions obtain different thermal conductivity results. The different results of amorphous and crystalline SiO₂ nano-films simply show that film thickness and grain morphology will cause different effects on thermal conductivity.

Abstract: In this paper the temperature field of Concrete Filled Steel Tube (CFST) member under solar radiation is simulated. The results show that temperature distribution caused by solar radiation is nonlinear over the cross-section of CFST member, and it is significantly varied with time and sections, the largest nonlinear temperature difference is over 26.3°C.