变形法计算混凝土应力的改进

Modification to deformation method of stress computation of concrete

为充分利用监测值,基于有限元分析改进了变形法计算混凝土应力,并推导了新的公式。改进后变形法精度更高,对监测值更加敏感。为考证新方法的正确性,以有限元计算的应变作为监测值,通过两种方法转换得其应力与计算的应力比较,说明其优越性,并找出影响变形法精度的关键因素。研究结果表明基准时间的确定对精度影响最大,转换步长的影响其次。最后将其应用于小湾工程取得了良好效果,可供其他工程参考。

To make better use of the monitored data,the deformation method is improved based on a finite element analysis,and new formulas are derived.The improved method is more accurate and more sensitive to the observed values.To verify the method,the simulated strain is taken as monitored data to save the strain observation efforts,and the stress is calculated by the two methods.A comparison of the calculated stress with the FEM simulated stress shows the advantages of the new method.The key influencing factors are obtained.The results show that the time reference has the most important effect,next is the time step of conversion.Application to the Xiaowan project indicates that the new method meets the engineering needs and it could be adopted in the other projects.