分为桁架式和圆筒式两种门架型式。

Two types of portal cranes: truss type and cylinder type, are available.

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复杂桁架式结构的稳定性分析成为当代大型起重机结构设计计算的难点。

So the stability analysis of complicated lattice structure becomes the crux of contemporary and large cranes' structure design and its calculation.

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跨越工程有很多种结构形式，桁架式跨越是跨越结构中较简单的形式之一。

There are a lot of forms of crossing pipeline structures, Truss crossing pipeline is one of the simplest form.

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