渡槽运行期温度荷载及边界条件分析

he scale of the large aqueduct of South—North water transfer is enormous, but the appearance of the cracks is common recently and then the research of temperature stress of aqueduct becomes important. The temperature loads during the runtime include yearly temperature change, the temperature change caused by the solar radiation in the summer, the temperature change caused when dropping in temperature in the winter, and the effect of ice load. Usually only the yearly temperature change is considered in the engineering design in the past. This paper introduced the four kinds of temperature loads of aqueduct during the runtime and the characteristics of aqueduct’s temperature boundary condition. The analysis is focused on the distribution of the temperature and the stress of the aqueduct in the solar radiation in summer and when cooling suddenly in winter. At the present this field of foreign research is shortage, and the internal research is limited to the sphere of the theoretical calculation which includes simplified calculation, three-dimensional steady state and transient state finite element calculation. Without the test data it is hard to know the complex boundary condition of the aqueduct. It is pointed at the last of this paper that the experiments of the temperature field and stress field simulating the actually climatic changes is the important direction of research of aqueduct’s temperature effects in the future.