复合筏基础的理论和应用

本文提出了砂垫层──钢筋混凝土板复合筏基础的设计思想，给出了这种基础的三维力学模型及其相应的内力计算方法．根据微分方程的相似性，将复合筏核基础的内力分析转换为三种不同支承和受荷情况的弹性地基板的叠加，并且用有限元方法进行了具体计算．通过算例和工程实例比较了复合筏基础和传统片筏基础的受力特性和造价、结果表明。复合筏基础具有内力小和造价低等优点．具有良好的工程应用前景．

Theory and application of a composite raft foundation

new idea to design a composite raft foundation consisting of sand layer and concrete plate isillustrated in this paper . Three dimension theoretical model of it is presented. On the analogy of thedifferential equation of a classic plate on elastic subgrade,the internal force of the concrete plate ina composite raft foundation can be calculated by superimposing the internal forces of three kinds ofthe plate on nonhomogeneous elaStic subgrade under different loadings. The finite element methodfor this is formulated. Comparising the behaviour and the cost of a composite raft with those oftraditional raft by numerical results and engineering aPPlications,it is shown that the composite raftis much better than traditional raft and can be used efficiently in practice.