摘要
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。
To more precisely calculate the line shape of pier body of hollow thin-walled high pier under the influence of sunshine temperature difference, the formulas for computing the line shape of pier body, based on the structure characteristics and measured sunshine temperature difference, are derived by analytical algorithm. Taking the 5th pier of Buyong Bridge of Jiali Highway in Guizhou province as project example, the pier top's displacements calculated by analytical algorithm, current code, and FEM program are compared with its measured values respectively. Furthermore, the effects of sunshine temperature difference, pier height, and wall thickness on the line shape of pier body are investigated. The results show that the calculation values via the formulas are more closer to the measured values than the ones via the current code with the maximum error of 0.507 mm, which proves the analytical algorithm is more reliable, of higher precision and stronger pertinence; the sunshine temperature difference and pier height have larger effects on the line shape of pier body, but the wall thickness has smaller effect. When the temperature difference is 10℃,the maximum longitudinal displacement of the 75 m high pier reaches 1.5cm, the effects of sunshine temperature difference and pier height on the line shape of pier body should be considered.
出处
《应用力学学报》
CAS
CSCD
北大核心
2016年第5期878-885,940-941,共8页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51378504)
高速铁路基础研究联合基金(U1334203)
关键词
实测
日照温差
空心薄壁高墩
线形计算
field measurement
sunshine temperature difference
thin-walled tall hollow pier
line shape calculation
