The concrete-filled in compression chord can help compression chord members very well, and reduce the steel tube strain;
受压弦杆内填混凝土能很好地协助钢管受力、减小钢管应变，提高受压节点的强度和刚度；
The lower chord of a vierendeel truss, when loaded, is subjected to the combined action of prestressed compression, large axial tension, moment and shear.
空腹屋架下弦处于预压力、强大的轴拉力、弯矩和剪力共同作用下工作。
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