（启迪设计集团股份有限公司， 苏州 215021）

［摘要］结合实际工程，介绍了超长混凝土结构考虑混凝土收缩、徐变影响下等效温差的计算方法，进行了桩基刚度的计算。建立基础无限刚和基础有限刚对比分析模型，在仅温度作用、恒载+活载+温度作用两种工况下，对超长混凝土结构温度应力分别进行了计算分析。结果表明，在考虑混凝土收缩、徐变影响时，在设定位置处基础有限刚模型计算所得的上部结构温度应力小于基础无限刚模型。考虑基础对上部结构真实的约束刚度，能够得到真实的温度应力。

［关键词］超长混凝土结构； 温度应力； 等效温差； 桩基刚度

中图分类号：TU375文献标识码：A文章编号：1002-848X(2017)20-0073-05

Influence of piled foundation stiffness on temperature stress of super-long concrete structure

Zhang Min, Zhu Yi, Wei Xiang, Zhu Liming

(Tus-Design Group Co., Ltd., Suzhou 215021, China)

Abstract:Based on the actual project, the calculation method of the equivalent temperature difference of super-long concrete structure under the influences of concrete shrinkage and creep was introduced, and the calculation of the stiffness of piled foundation was carried out. Based on the contrast analysis models of the infinite rigid foundation and the finite rigid foundation, the temperature stress of the super-long concrete structure was calculated and analyzed respectively under the two working conditions of temperature action and dead loads+live loads+temperature action. The results show that under the influence of concrete shrinkage and creep, the temperature stress of the upper structure model with finite rigid foundation in corresponding parts is less than that of the structure model with infinite rigid foundation. Considering the real constraint stiffness of the upper structure by foundation, the true temperature stress can be obtained.

Keywords:super-long concrete structure; temperature stress; equivalent temperature difference; stiffness of piled foundation

作者简介：张敏，学士，教授级高级工程师，一级注册结构工程师，总工程师，Email:min.zhang@siad-c.com。