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木材是一种天然的建筑材料,不但同一品种,就是同一根木料的力学性能在不同的部位也有差异,因此,正确选料,合理使用木材是保证木屋架制作质量的关键。组成屋架的各个杆件,受力性质和大小是不同的。有的杆件受轴向拉力,有的受轴向压力。对于常用的三角形豪式屋架来说,上弦杆受压力,下弦杆受拉力,向内下倾斜的斜杆受压力,竖杆受拉力。杆件内力的大小,对于上,下弦来说,是从端部节点向
Wood is a kind of natural building material. Not only the same kind of wood, but also the mechanical properties of the same wood are different in different parts. Therefore, the correct choice of materials and the rational use of wood are the key to ensure the quality of wooden trusses. The various components that make up the truss are different in nature and size of force. Some rods are subject to axial tension and some are subjected to axial pressure. For a commonly used triangular overhead truss, the upper chord is under pressure, the lower chord is under tension, the inwardly-inclined slant is under pressure, and the vertical is under tension. The magnitude of the internal force of the rod, for the upper and lower strings, is from the end node