论文部分内容阅读
基于某1/3缩尺比例试验安全壳,针对该安全壳筏基变截面处混凝土开裂问题,将该安全壳用混凝土的绝热温升试验曲线和其他关键热力学参数测定结果作为关键输入参数,采用ANSYS建立1/4的筏板基础、变截面混凝土及筒身部分施工层三维有限元模型,动态分析了变截面处混凝土浇筑后30 d的温度变化,与测量值形成对比,并预测了变截面处混凝土的应力、应变变化过程。结果表明:计算得到的测点温度动态值与测量值吻合很好,最高温度仅相差2℃。现场状态及有限元分析均表明,变截面处混凝土的最大应力出现在变截面与基础的交界处和截面突变处。
Based on a 1/3 scale test containment, according to the concrete cracking problem of the raft foundation, the adiabatic temperature rise test curve and other key thermodynamic parameters of the containment are taken as the key input parameters. ANSYS established a four-dimensional finite element model of raft foundation, variable section concrete and the cylinder body of the quarter of the dynamic change of 30 days after the placement of concrete at variable cross-section, in contrast with the measured values, and predict the variable cross-section Office of stress and strain changes in the process. The results show that the calculated dynamic temperature at measuring point is in good agreement with the measured value, and the maximum temperature only differs by 2 ℃. The field conditions and finite element analysis show that the maximum stress of the concrete at the variable cross section appears at the interface of the cross section and the foundation and the abrupt change of the section.