The single-chorded plane space truss have the low flexural rigidity out of plane because of lacking bottom chord.
单弦杆平板网架由于无下弦杆，因而具有平面外抗弯刚度较低的特点。
The double groove steel is suspended under the two nodes of bottom chord of steel roof truss to prevent the bottom chord from stretch bending.
文章论述了在设计中采用钢屋架下弦两节点下悬吊双槽钢作为分布梁避免钢屋架下弦拉弯工作。
In which one of them was common reinforced concrete structure, and the other used prestressed steel reinforced concrete (PSRC) in bottom chord of the transfer structure.
其中一榀模型为普通钢筋混凝土结构，另一榀模型在底部转换梁施加了预应力，并在底部转换梁及部分杆件采用了钢骨混凝土。
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