局部双层球面网壳整体后张拉成形研究  

Research on Shape Forming of Partial Double Layer Spherical Surface Shell by Post-Tensioning

作　　者：贺程[1] 郝际平[1] 方敏勇[2] 高飞[1] 周培辉[1] 

机构地区：[1]西安建筑科技大学,西安710055 [2]西安建筑科技大学富煌钢构研究院,西安710055

出　　处：《建筑科学》2012年第7期79-83,62,共6页Building Science

基　　金：富煌钢构基金

摘　　要：首先提出一种合理的新型单弦杆平板网架结构模型,通过张拉带有预留缝隙的下弦杆中的内穿钢索,使平板网架整体张拉成空间球面网壳。然后推导出预测成形形状的理论公式,并利用有限元计算程序ANSYS11.0,对不同有限元模型模拟其张拉成形过程。分析表明:理论公式可以很好的预测网壳成形形状,与有限元计算结果吻合较好。其成形形状仅与预留缝隙值大小有关,可以忽略不同节点连接形式对成形形状的影响。最后,对张拉成形前后同一环向各节点的位移情况进行研究,结果表明:位移误差随着预留缝隙值的增大而增大,但并不影响整体成形。At first,a reasonable model of a new kind of single-chorded plane space truss is proposed in the paper. The whole plane space truss could be transformed into space spherical surface shell through tensioning the inner steel of the chord in its reserved gap. What＇s more, predicting formulas of forming shape could be deduced through theoretical model. ANSYSI1.0 is employed to simulate the tensioning process in several kinds of finite element models. It is shown that theoretical formulas could predict the forming shape of truss perfectly, which matches well with the calculating results of finite element models. The forming shape is only influenced by the reserved gap, and has little connection with different joint forms. Finally, according to the research on the displacement of each joint on the identical ring before and after tensioning, it is indicated that displacement error increases with the rising of the reserved gap value, however, it affects little the whole forming.

关 键 词：单弦杆平板网架 后张拉 局部双层球面网壳 成形形状 

分 类 号：TU356[建筑科学—结构工程] TU311.2