过河缆一般跨度较大,可以略去其对湾曲的抵抗力,而把它看作柔索。它架在河的上空受三种力却自重、风力、及测船拉力的作用。自重和风压力是沿曲线均布的荷重,因过河缆曲度及垂度小,曲线上部分弧长的投影略等于该弧长,故自重及风压力可视力均匀分布于水平方向,测船拉力则为一集中荷重。均布荷重,使过河缆成一抛物线形如图一。单 Cross the river cable generally larger span, you can omit its resistance to the Bay song, and think of it as a soft cable. It stands over the river by three kinds of force but self-respect, wind, and the role of measuring the pulling force. The self-weight and wind pressure are the loads distributed along the curve. Because the curvature and sag of the river cable are small, the projection of the arc length on the curve slightly equals to the arc length, so the self-weight and wind pressure visual force are evenly distributed in the horizontal direction. Rally is a concentrated load. Uniform load, the river cable into a parabolic shape as shown in Figure 1. single