Analysis of Temperature Fieldand Debonding of CFST Members in Northwest Region of Large Temperature Difference
In order to study the variation law of temperature field in the cross-section of steel tube concrete components and the debonding situation of the interface between steel tube and core concrete under the conditions of large temperature difference in the northwest,typical daily average atmospheric temperatures in Urumqi,Xinjiang and Xining,Qinghai were selected.Through temperature impact cyclic environmental simulation testing methods,the temperature field of plain concrete,steel tube concrete components,and debonding testing of steel tube concrete components were conducted in twelve time periods in atmospheric simulation boxes,the interface bonding state of steel tube concrete in the temperature field of sudden temperature changes under the large temperature difference environment in the northwest is analyzed.The results show that,under the repeated action of large temperature difference,the non-synchronous thermal expansion caused by material difference will cause interface debonding between steel tube and core concrete,and the greater the temperature difference is,the more obvious it is.When the radial temperature changes on the same series,the temperature changes lag more with the diameter decreasing.When the atmospheric temperature drops sharply,the steel pipe will have a coupling effect on the core concrete,and the lower the temperature,the stronger the coupling effect of the steel pipe.
steel tube concretetemperature fieldNorthwest regionlarge temperature differencedebonding
万方数据
维普
