在螺纹材料、尺寸、载荷都相同的情况下，三角形螺纹牙所受的剪应力最小，断裂载荷也比梯形螺纹和矩形螺纹高。
In the same material, dimension and load circumstance, the cut stress of the triangle thread is smallest. Its rupture load is higher than the echelon and rectangle.
采用梯形梁单元分析砖石拱桥在载荷作用下的行为。
A tapered beam element model is used to simulate the behaviour of a masonry arch bridge with loading.
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