不同软件计算筏板基础沉降对比分析

Sedimentation Analysis and Comparison of Raft Foundation in Different Software

在筏板基础设计中,由于采用的计算模型或简化方法不同,不同软件或同种软件不同假定的计算结果存在较大差异,设计可能采用不合理的模型或假定。筏板的沉降以及差异沉降作为设计控制的关键指标,尤其需要合理地选择计算假定。本文以某实际工程为研究对象,应用通用有限元软件ANSYS及常用设计软件JCCAD对筏板基础沉降进行分析,对比两种软件相同假定下结果差异及安全性,得到设计软件假定的适用范围;并使用ANSYS模拟各假定条件,比较沉降计算结果的差别,讨论了不同假定下沉降随土刚度的变化情况,对基础设计中使用的设计假定选择提出建议。研究表明,通过合理的参数选择,使用JCCAD中弹性半空间假定分析沉降具有较高的安全储备。

In raft foundation design, usual design software may cause great result differences among different software or different postulates in one program for different calculate models or simplify methods used. As the key component of design, sedimentation and differential sedimentation has the issue of choosing computation postulates. Based on an actual project, using universal finite element software ANSYS and design software JCCAD, the sedimentation of raft foundation is analyzed, the results and safety in different assumptions are compared, and the scope of application is obtained. Then the computation postulates are sinulated by ANSYS, the differences of sedimentation are compared, changes of sedimentation discussed by soil stiffness, some advices are give for the selection of the universal software of foundation design by simulating the assumptions. Analysis results indicate that by reasonably choosing parameters in design, by using elastic half-space postulate we can get more safety stock.