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在圬工拱桥的设计中,有时要用到“结构力学”中的图解法来绘制拱的压力索多边形(或压力索曲线),由此求得拱圈各截面的弯矩值。对于“结构力学”叙及的拱在竖向荷载作用下的图解法,我们觉得有以下二个问题在概念上值得加以补充说明: 一、拱的压力索多边形(或压力索曲线)与拱的压力线的差别和联系; 二、绘制无铰拱的压力索多边形(索曲线)与压力线的起始点问题。
In the design of arch bridge, sometimes the “structural mechanics” in the graphic method used to draw arch pressure cable polygons (or pressure cable curve), thus obtaining the curvature of each section arch ring. For the illustration of the arch of structural mechanics under the action of vertical load, we think that there are two problems that are worth noting in terms of concept: First, the pressure of the arch between the cable polygons (or pressure curves) and the arch Pressure lines of the difference and contact; Second, draw the hinge arch pressure cable polygons (cable curve) and the starting point of the pressure line.