Study On Temperature Effect Of P.C. Continuous Rigid Frame Bridge With High Pier And Thin Wall

With the thin-walled high pier prestressed concrete continuous rigid frame bridge of a large number of construction, bridge construction, many problems arising in the process, in which the temperature cracks caused by thermal stress problem is particularly prominent. Nearly half a century, the practice of concrete bridges at home and abroad shows that only consider the role of temperature change in temperature is not enough, for most of the bridge structure, the role of this temperature produces only vertical displacement changes along the bridge will not or produced only small temperature stress. But many concrete box girder construction with operations in serious crack on the phenomenon that there is structural damage caused by thermal stress cracking. Through a large number of experimental studies have shown that strong solar radiation and temperature effect caused by the cold, the sun caused by the cooling temperature effect on the concrete box girder is far greater than the temperature effect on temperature effects on the concrete box girder.This paper systematically discusses concrete box structure of the temperature distribution theory, the formation of sunshine and temperature characteristics, temperature distribution of the impact of sunshine a major factor. And to Shi Wang River Bridge Bridge as a background, calculated according to different specifications of the solar temperature effect the upper box, analyzed and compared the results of various specification differences between the temperature reached the upper box in the sunshine under the load of the temperature stress and temperature the distribution of deformation on buried within Thin wall temperature, strain measurement device for a lot of testing to obtain a wealth of measured data, through the analysis of measured data, derived or found in Northern Shaanxi North climate similar to the region temperature distribution Thin concrete expression, and on the lower section and the lower pier due to the temperature load temperature difference between the upper structure of the stress of sunshine, sunshine and temperature were calculated displacement of comparative analysis.