【摘要】 为了解张拉整体四棱柱单元体的结构特性,并为大跨度组合式张拉整体屋盖研究奠定基础,用非线性有限元方法分析了张拉整体四棱柱单元体在荷载作用下的内力和位移.采用所设计的半球节点,用张拉整体四棱柱单元体足尺模型研究了荷载作用下的结构特性,得到了不同预应力下的理论和试验的荷载位移及荷载内力曲线,经比较,理论值与试验值相一致.从理论分析和试验研究中得到了预应力与结构刚度、承载力的关系及预应力与结构非线性变化的关系,给出了张拉整体四棱柱单元体一阶刚度的特性.更多还原

【Abstract】 In order to obtain structural characteristic of quadrangular prism unit of tensegrity and to make pre- paration for study on assembled large-span tensegrity structures, analysis was made on internal force and displacement of quadrangular prism unit of tensegrity under load by nonlinear finite element method (FEM).Study on structural characteristic under load was made by full size model test in scale of 1∶1 with semispherical joint, which was designed in this study.The curves of load-displacement and load-force under different prestress levels were analyzed.The result of test was consistent with that of the theoretical analysis. Based on that, the relation between prestress and structural stiffness, bearing capacity, as well as the relation between prestress and structural nonlinear feature and characteristic of the first-order stiffness were carried out.更多还原