设计绕两个主轴发生弯曲的钢梁是比较麻烦的,本文介绍钢梁选择的快速图解法。双向弯曲当荷载以倾斜的方向作用到梁截面上时产生绕两个主轴x-x和y-y方向同时弯曲(图1)。双向弯曲梁的经济选择,通常是用费时的试算法,但是借助于像图2和图3那样,就可被简化。这些图能够使设计者根据容许弯曲应力很快地选出一根梁。 Designing a steel beam that bends around two spindles is troublesome. This article presents a quick illustration of steel beam selection. Bi-directional bending Bends both directions x-x and y-y around the two main axes as the load acts on the beam cross-section in a tilted direction (Figure 1). The economical choice of two-way bending beams is usually a time-consuming trial, but can be simplified with the aid of figures 2 and 3. These figures allow the designer to quickly pick a beam based on allowable bending stress.