Research Of Thermal Action On Prestressed Concrete Structures

The temperature variety of environment that prestress concrete members lie and inner prestress concrete members had been studied according to high structure construction. By digital technique, the prestressing's change had been studied depending on periodical temperature and got some important datas. The results show that the temperature variety in prestress concrete could not been neglected. The main factors that affect the temperature distribution had been analyzed basing on experiment results and much datas of environment variety, and provided a simple curve about periodical variety environment temperature. The model was built up according to transmission heat subject of temperature field in prestress concrete members, and analyzed the regulation of difference in temperature, divided different in temperature into transverse difference in temperature and lengthways difference in temperature, and gave some formulas.According to different transverse difference in temperature and lengthways difference in temperature, the paper gave the method of computing temperature effect including :1)the stress ot1 caused by nonlinear difference in temperature. 2) the constrain stress o t2 in undetermined structures byequivalent difference in temperature. 3) the constrain stress ot3 caused in undetermined structures by even difference in temperature Tm. 4) the deformation of beams caused by the lateral constrain and even difference in temperature Tm, and the prestressing caused by different temperature deformation. The experiential formulas of temperature effect on prestressed structures can guide design and construction.Partial research production of this paper has been appraised by a group of experts, and the result of appraisal is up to international advanced level.