上部结构、筏板基础和地基共同作用的有限元分析

考虑上部结构、筏板基础和地基的共同作用,运用ANSYS有限元计算方法,通过上部结构、筏板基础和地基之间在连接点处的静力平衡和变形协调条件,分析了上部结构对筏板基础变形、内力影响以及筏板基础对上部结构变形、内力的影响,探讨了共同作用的影响规律。计算结果表明,考虑共同作用时,上部结构承担了部分筏板基础荷载,使筏板基础内力、变形减小;考虑筏板基础的刚度时,由于整体弯曲的作用,使上部结构的应力产生重分布,梁产生了附加弯曲应力,增大了上部结构的内力,因此在工程设计中应考虑共同作用的影响,使工程更安全、更经济。

FEA on Interaction of Super Structure, Raft Foundation and Ground Base

Considering the interaction of super structure,raft foundation and ground base by using the calculation method of ANSYS procedure and the condition of the stationary balance of the linked point between super structure,raft foundation and the distortion harmony condition,the effects of super structure stiffness on the stress,strain of the raft foundation,and effects of raft foundation on the stress and strain of super structure were analyzed;the influence regularity of the interaction was discussed.Results show that when considering the interaction,super structure bears some load of raft foundation and reduces the stress and strain,however,when considering the stiffness of the raft foundation,because of whole bending,super structure stress is re-distributed;the added flexural stress is produced in beams,and the stress of super structure is increased.To make the projects more security and economical,the effects of interaction should be taken into consideration in the engineering design.