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为了更为准确地计算日照温差影响下空心薄壁高墩的墩身线形,针对其结构特点,采用解析方法导出了基于实测日照温差的墩身线形计算公式。以贵州省驾荔高速公路布用大桥5号空心薄壁高墩为实例,将5号墩墩顶位移解析计算值、规范计算值、有限元计算值、现场实测值进行比较,并分析了日照温差、墩身高度、壁厚对墩身线形的影响。结果表明:解析算法计算结果可靠,针对性强,较规范计算值更接近于墩顶实测值,最大差值仅0.507mm,具有相当高的精度;日照温差和墩身高度对墩身线形的影响较大,对壁厚的影响较小;温差为10℃时,75m高墩顺桥向最大偏移达1.5cm,在高墩施工中应考虑日照温差和桥墩高度对墩身线形的影响。
In order to calculate the line shape of pier with hollow thin-walled high pier under the influence of sunshine temperature more accurately, the linear formula of pier shape based on measured sunshine temperature difference is derived by analytical method according to its structural characteristics. Taking the No. 5 Hollow Thin-walled High-pier of Fu-da Bridge over Guizhou-Li-Li Expressway as an example, the displacements of No. 5 pier are compared with the calculated values, the calculated norms, the calculated values of finite elements and the measured values of the field. Influence of temperature difference, pier height and wall thickness on line shape of piers. The results show that the analytical results are reliable, well-targeted and more approximate to the measured values at the pier top than the standard calculated values, the maximum difference is only 0.507mm, with a very high accuracy; the influence of sunshine temperature difference and pier height on the linear shape of piers The bigger the influence on the wall thickness is. When the temperature difference is 10 ℃, the maximum deviation of the 75m high pierside bridge reaches 1.5cm. In the construction of high piers, the influence of sunshine temperature difference and piers height on the linear shape of piers should be considered.