Parallel chord iteration
parallel chord steel truss
truss of parallel chord
nonparallel chord truss
pre-stressing chord truss
Cable-Stayed Space Truss
equivalent space truss displacement emthod
longitudinal space truss
long-span space truss structures
single-chorded plane space truss
Space Truss
空间桁架
空间桁架结构
空间网架
空间桁架理论
空间钢桁架
网架结构
平板网架
立体桁架
立体构架
网壳结构
网架
space truss string structure