Study on Buckling Design Methods of Single Layer Two Way Grid Lattice Shell

1.对新研制的标准化桁架体系节点进行了处理，使之适用于单层双向网壳。通过弯曲实验确定了复合材料的结构性能。1)力矩与转角的关系近似为三次线性关系。2)铸件轴力由拉变压，节理分离度和屈服力矩增大。3)从数值计算结果来看，节点的刚度基本上取决于节点截面性能与圆管截面性能的比值。进行了PC杆为斜杆的单层双向网壳的屈曲试验。1)PC杆的初始轴力与指定值对应。2)当PC杆的初始轴力较大时，有可能使屈曲荷载增大。3)离散处理方法适用于计算这类壳体的屈曲行为。带PC杆的单层双向网格高压壳在中心荷载作用下工作。分析了高压杆网壳的变形性能和PC杆对初始轴力的影响。采用离散处理方法，对有无PC杆的单层双向网壳进行了分析。1)PC杆的初始轴力为零，设置PC杆的壳体的屈曲荷载大多是不设置PC杆的壳体的1.5~3倍。2)当壳体的分割数和PC杆的初始轴力较大时，有PC杆的屈曲荷载与无PC杆的屈曲荷载之比较大。3)PC杆件的屈曲荷载与初始轴力之间存在三种关系。

1. The newly developed standardized truss system joint is treated in order to apply to single layer two-way grid shell. The structural properties were determined by the bending experiment. 1) The relation of moment to rotational angle is almost approximated to tri-linear. 2) The separation and the yield moment of joint increase in cast that the member axial force changes from tension to compression. 3) From the numerical results, the rigidity of joint is almost dependent on the ration of sectional property of joint to that of circular tube.2. The buckling experiments of single layer two way grid dome with PC bar as diagonal member are performed. 1) The initial axial forces of PC bars correspond to the specified value. 2) The increase of buckling load is possible in case that the initial axial force of PC bar is significant value. 3) The discrete treatment method is applicable to calculating the buckling behaviors of these shells.3. The single layer two way grid HP shell with PC bars is subjected under central loading. The deformation behavior of HP latticed shell and the effect of initial axial forces introduced by PC bars are examined.4. The single layer two way grid shells with and without PC bars were analyzed by the discrete treatment method. 1) The initial axial force of PC bars being zero, most of buckling loads of shells with PC bars are from 1.5 to 3 times larger than that of shells without PC bars. 2) When the division number of the shells and the initial axial forces of PC bars are larger, the ration of the buckling load with PC bars to that without PC bars becomes higher. 3) There are three kinds of relations of the buckling load to the initial axial force of PC bars.