该方程的形式规则统一，计算过程简单，稍加改进可以推广到平面刚架的内力和变形计算中去。
The equation is simple, uniform and easy to extend to plane rigid frame with some modification.
刚架桥最简单也可能是最早使用的-即刚架桥河流。
The simplest bridge may be just the first use - or just the river bridge.
对门式刚架轻型钢结构的组成特点进行了简单介绍。
The character of lightweight steel structure portal frame was introduced.
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