混凝土结构跳仓作业方案设计难点与温度应力分析
李 东,彭 程

(上海大学 土木工程系,上海 200444)

超长底板; 温度应力; 裂缝控制; 数值计算;

Design difficulties and temperature stress analysis of concrete construction alternative construction
LI Dong, PENG Cheng

(Department of Civil Engineering, Shanghai University,Shanghai 200444, China)

super-long basement-floor; temperature stress; crack control; numerical computation;

DOI: 10.15986j.1006-7930.2019.04.002

备注

以某超大底板跳仓作业为例,分析了该混凝土底板结构跳仓施工方案设计中的主要难点,并编写了粘弹性温湿耦合有限元数值分析程序,模拟分析了施工阶段底板温度及温度应力变化情况,同时将模拟结果与实测结果进行了对比,验证了数值分析程序的准确性.在此基础上通过设置程序中的边界条件对新老混凝土接缝处的温度及温度应力变化进行了分析,并分析了跳仓间隔对新老混凝土接缝处应力释放的影响,给出了接缝处在不同种类水泥水化热影响下的应力释放规律.其分析结果可填补跳仓施工理论研究的空缺并为相似工程跳仓施工方案设计提供参考.

This paper takes the construction of a large base-plate as example,to analyze the main difficulties in the design process of the alternative construction plan. The authors developed a finite element visco-elastic numerical program coupling temperature-moisture and simulated the law of temperature and temperature stress variation about base-plate in construction. At the same time, the simulation results are compared with the measured results to verify the accuracy of the written numerical analysis program. On this basis, the temperature and temperature stress variation about the construction joints and the effect of the concrete placing time-gap on the stress release of old and new concrete joints are analyzed. The paper gives the stress release law of joints under different types of cement hydration heat. Analysis results can fill the gap of the alternative bay methods theory research and provide reference for the design of the construction scheme about similar projects.