采用輕型屋面，不僅可減小梁柱截面尺寸，基礎也相應減小。

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個屋脊的大雙坡屋面，為長坡面排水創(chuàng)造了條件。設中間柱可減小橫梁的跨度，從而降低造價。中間柱采用鋼管制作的上下鉸接搖擺柱，占空間小。

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.

剛架的側向剛度有檁條的支撐保證，省去縱向剛性構件，并減小翼緣寬度。

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.

剛架可采用變截面，截面與彎矩成正比；變截面時根據(jù)需要可改變腹板的高度和厚度及翼緣的寬度，做到材盡其用。

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.

剛架的腹板可按有效寬度設計，即允許部分腹板失穩(wěn)，并可利用其屈曲后強度。

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.

豎向荷載通常是設計的控制荷載，但當風荷載較大或房屋較高時，風荷載的作用不應忽視。在輕屋面門式剛架中，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.

支撐可做得較輕便。將其直接或用水平節(jié)點板連接在腹板上，可采用張緊的圓鋼。

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

結構構件可全部在工廠制作，工業(yè)化程度高。構件單元可根據(jù)運輸條件劃分，單元之間在現(xiàn)場用螺栓相連，安裝方便快速，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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