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随着桥架结构向大跨、薄壁、轻型、整体方向发展,预应力混凝土箱形梁将会日益广泛地使用。国内已在襄渝线上建成了无碴无忱箱形梁桥一座,并将在九江长江大桥上大量使用40m无碴无枕箱形梁。这类结构中相当大的温差以及相应的温度应力与位移,已越来越引起人们注意。国外1965年曾报道过预应力混凝土箱形梁由于温差引起的损坏,1972年又报道过某高架桥由于温差
With the bridge structure to large-span, thin-walled, light, the overall direction of development, prestressed concrete box girder will be increasingly widely used. The country has built a ballastless infill box girder bridge in Xiangyu-Chongqing and will make extensive use of 40m ballastless box-shaped beam on Jiujiang Yangtze River Bridge. Such structure, a considerable temperature difference and the corresponding temperature stress and displacement, has drawn increasing attention. Abroad in 1965 has reported prestressed concrete box girders due to temperature difference caused by damage, in 1972 also reported a viaduct due to temperature difference