（1 上海大学土木工程系， 上海 200444； 2 舜元建设（集团）有限公司， 上海 200335）

［摘要］以采用跳仓法施工的上海市徐汇区某商品房的372m全长超限筏板基础为例，基于线性徐变理论，对混凝土松弛应力计算公式进行推导。根据温度及应变监测数据，对考虑松弛及徐变影响的混凝土黏弹性应力进行计算。分析了在不同保温措施下筏板基础温度应力的演变规律，制定了符合本项目的裂缝控制措施。研究结果表明：所推导的混凝土松弛应力计算公式具有一定的准确性及实用性；根据应力计算结果制定的裂缝控制措施在工程实践中发挥了很好的作用。

［关键词］超限筏板基础；跳仓法施工；裂缝控制；保温措施；松弛应力

中图分类号：TU375-2文献标识码：A文章编号：1002-848X(2021)08-0132-07

Study on early stress state of out-of-code raft foundation with alternative bay construction method

LI Dong1, LIU Yang1, LI Jiong2, ZHANG Yechen1

(1 College of Civil Engineering, Shanghai University, Shanghai 200444, China; 2 Shunyuan Construction (Group) Co., Ltd., Shanghai 200335, China)

Abstract:Taking the 372m super-long out-of-code raft foundation of a commercial house with alternative bay construction method in Xuhui district of Shanghai as an example, based on the linear creep theory, the calculation formula for the relaxation stress of concrete was deduced. According to the temperature and strain monitoring data, the viscoelastic stress of concrete considering the effects of relaxation and creep was calculated. The evolution law of the temperature stress of the raft foundation under different insulation measures was analyzed, and the crack control measures in accordance with the project were formulated. The research results show that the deduced concrete relaxation stress calculation formula has certain accuracy and practicability; the crack control measures based on the stress calculation results have played a very good role in engineering practice.

Keywords:out-of-code raft foundation;alternative bay construction method;crack control;insulation measure;relaxation stress

*上海市建委项目（17Z44225）。

作者简介：李东，博士，Email：lidongbibo@163.com。