英语翻译（土木专业）We usually think of the lateral-torsional buckling

英语翻译（土木专业）
We usually think of the lateral-torsional buckling of a beam as leading to the failure of that member.Additionally,however,some types of framing systems may suffer stability failures owing to inadequate lateral support of the compression flanges of the beams.One example is the case of an overhanging beam resting on top of a steel column,as shown in Figure 4-14.In this case lateral support of the top flange alone may be inadequate.The ASDS Commentary,Section B6,discusses this situation.In the situatuon shown,bracing exists only in the plane of the top flange,and the resistance of the column to lateral movement is insignificant.The bottom flange is free to buckle laterally as shoen on Figure 4-14b.Unless lateral support is provided for the bottom flange by some means,such as bracing at the beam-to-column connection,lateral displacement at the top of the column accompanied by rotation of the beam about its longitudinal axis may lead to collapse of the framing.
In some cases bracing techniques such as those shown in Figure 4-15 may be used.Additionally,when structural members do not exist on the column centerline (as may be observed in photo 4-1),one solution is to use web stiffeners on the overhanging beam web in combination whith an adequately connected bearing plate (cap plate)on top of the column.This may also be observed in Photo 4-1.

We usually think of the lateral-torsional buckling of a beam as leading to the failure of that member. Additionally, however, some types of framing systems may suffer stability failures owing to inadequate lateral support of the compression flanges of the beams.
我们通常认为横梁的侧扭屈曲是导致整个构件失效的原因。不过，还有一点，对横梁的压缩翼缘的横向支承不足也会促使一些框架系统的不稳定。
One example is the case of an overhanging beam resting on top of a steel column, as shown in Figure 4-14. In this case lateral support of the top flange alone may be inadequate. The ASDS Commentary, Section B6, discusses this situation. In the situation shown, bracing exists only in the plane of the top flange, and the resistance of the column to lateral movement is insignificant. The bottom flange is free to buckle laterally as shown on Figure 4-14b. Unless lateral support is provided for the bottom flange by some means, such as bracing at the beam-to-column connection, lateral displacement at the top of the column accompanied by rotation of the beam about its longitudinal axis may lead to collapse of the framing.
如图4-14所示的钢柱顶部的悬臂梁，就是一个例子。这个梁上翼缘只有横向支承是不够的。在ASDS建筑评述的第B6节讨论了这种情况；该情况显示，只有梁上翼缘的平面有支撑，而柱子对横向移动的阻力微不足道。如图4-14b 所示，底板可以随意侧向屈曲。除非通过某些手段给底板提供支承，例如在梁柱连接点给予支撑，否则，柱子顶部的侧向移位，加上横梁纵轴的转动，将导致框架的倒塌。
In some cases bracing techniques such as those shown in Figure 4-15 may be used. Additionally, when structural members do not exist on the column centerline (as may be observed in photo 4-1), one solution is to use web stiffeners on the overhanging beam web in combination with an adequately connected bearing plate (cap plate)on top of the column. This may also be observed in Photo 4-1.
图4-15所示的支撑技术，在某些情况会被派上用场。另外，当结构的构件不在柱子的中心线时（参阅照片4-1），一种解决的方法是在悬梁腹板使用加劲肋，再在柱子顶部以承载板（盖板）适度地连接。这也在照片4-1能看到。