采用轻型屋面，不仅可减小梁柱截面尺寸，基础也相应减小。

By adopting a lightweight roof, not only can the cross-sectional dimensions of beams and columns be reduced, but the foundation is also correspondingly reduced.

在多跨建筑中可做成一个屋脊的大双坡屋面，为长坡面排水创造了条件。设中间柱可减小横梁的跨度，从而降低造价。中间柱采用钢管制作的上下铰接摇摆柱，占空间小。

In multi span buildings, a large double sloping roof can be made into a ridge, creating conditions for drainage on long sloping surfaces. Setting an intermediate column can reduce the span of the crossbeam, thereby lowering the cost. The middle column is made of steel pipes with hinged upper and lower swing columns, which takes up little space.

刚架的侧向刚度有檩条的支撑保证，省去纵向刚性构件，并减小翼缘宽度。

The lateral stiffness of the rigid frame is ensured by the support of purlins, eliminating the need for longitudinal rigid components and reducing the flange width.

刚架可采用变截面，截面与弯矩成正比；变截面时根据需要可改变腹板的高度和厚度及翼缘的宽度，做到材尽其用。

The rigid frame can adopt a variable cross-section, which is proportional to the bending moment; When changing the cross-section, the height and thickness of the web plate and the width of the flange can be changed as needed to achieve the best use of materials.

刚架的腹板可按有效宽度设计，即允许部分腹板失稳，并可利用其屈曲后强度。

The web plate of the rigid frame can be designed according to the effective width, which allows for partial instability of the web plate and can utilize its post buckling strength.

竖向荷载通常是设计的控制荷载，但当风荷载较大或房屋较高时，风荷载的作用不应忽视。在轻屋面门式刚架中，地震作用一般不起控制作用。

Vertical load is usually the control load in design, but when the wind load is large or the building is high, the effect of wind load should not be ignored. In light roof portal frames, seismic effects generally do not have a controlling effect.

支撑可做得较轻便。将其直接或用水平节点板连接在腹板上，可采用张紧的圆钢。

The support can be made relatively lightweight. It can be directly or horizontally connected to the web plate using tensioned round steel.

结构构件可全部在工厂制作，工业化程度高。构件单元可根据运输条件划分，单元之间在现场用螺栓相连，安装方便快速，土建施工量小。

All structural components can be manufactured in the factory, with a high degree of industrialization. The component units can be divided according to transportation conditions, and they are connected on-site with bolts, making installation convenient and fast, and the amount of civil construction is small.

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