摘要
在简化计算组合梁的基础上,利用ANSYS有限元程序对组合梁钢框架与地基基础的共同作用进行了建模计算,讨论了不同基础形式和刚度对上部框架的影响,以及按组合框架与按纯钢框架计算的差别。分析结果表明,基础变形对组合梁钢框架的内力重分布的影响是显著的;与不考虑组合作用的计算方法相比,按组合框架计算不仅使竖向荷载作用下中间支座处梁截面负弯矩大幅度下降,有利于支座节点的设计,同时也使整个结构的刚度提高,解决了水平荷载作用下钢框架本身过于柔弱、层间位移难以控制、底层柱子弯矩过大的问题;此外,考虑组合作用加大了对基础变形的约束,也使基础沉降差异引起的上部结构的次生应力变小。
The interaction between steel frame with steel-concrete composite beam and foundation was calculated by the ANSYS finite element program in this paper. The effect of foundations with different stiffness on upper-frame and the difference between the calculated results of composite-beam frame considering and neglecting the composite action were discussed. The analyzed results indicate that the foundation deformation has evident effect on the redistribution of internal forces of composite-beam frame. When the composite action between composite steel beam and floor slab is considered, comparing with the unconsidered one, the negative moment between the intermediate supports is reduced under the vertical load and the stiffness of upper-structure is boosted, the interstory displacement and the moment of column base are reduced under the lateral load. In addition, the constrain effect on the deformation of foundation is increased and the secondary stress of the upper-frame caused by the different settlements from the foundation is reduced.
出处
《南京工业大学学报（自然科学版）》
CAS
2004年第6期1-6,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
江苏省应用基础研究项目(BJ95089)
江苏省建设厅资助项目(JS200001)
