| With more wide application of the concrete filled steel tube in bridges and other projects,more theoretical researches about the structure have been done,temperature is an important research problem.In this paper,the measurement of the temperature field of concrete filled rectangular steel tube section under the action of sunlight was carried out,and the temperature field was analyzed.In this paper,the temperature field of concrete filled rectangular steel tube section under outdoor sunlight was measured,the distribution and variation of the temperature field were analyzed by using the experimental data,results show: the temperature field of the concrete filled rectangular steel tube section presents obvious heterogeneity at each moment and Index movement in time;the temperature changes more slowly and the time of the central point peak temperature appears 2 hours later than the roof steel surface measuring point.The formula of the maximum temperature difference distribution along the diagonal direction of the test specimen is fitted according to the measured temperature data.The finite element method was used to analyze the temperature field of concrete filled rectangular steel tube section,the basic principle of this method was introduced,the sunshine boundary conditions and the solar radiation were discussed.The finite element software ABAQUS was used to simulate the temperature field of concrete filled rectangular steel tube section,the finite element results were compared with the measured data.The calculated values of the measuring points are in good agreement with the measured values and the finite element simulation of temperature field is effective.The temperature stress analysis of the section shows: the maximum temperature difference stress is 22 MPa,the maximum stress is 18.8 MPa when temperature raises 30 ? or decreases 30 ?,and the stress is greater where the steel is in contact with the concrete,the maximum stress occurs at the section corner. |
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