Light steel structure is a new type of structure developed on the basis of ordinary steel structure. It includes all steel structures under light roof.

与普通钢结构相比，有较好的经济指标。轻型钢结构不仅自重轻、钢材用量省、施工速度快，而且它本身具有较强的抗震能力，并能提高整个房屋的综合抗震性能。是目前工业厂房应用较广泛的一种结构。

Compared with ordinary steel structure, it has better economic index. Light steel structure not only has light weight, low steel consumption and fast construction speed, but also has strong seismic capacity and can improve the comprehensive seismic performance of the whole house. It is a widely used structure in industrial plants.

轻型钢结构由基础梁、柱、檩条、层面和墙体组成

Light steel structure consists of foundation beam, column, purlin, layer and wall

单层轻型房屋一般采用门式刚架

Single storey light houses generally use portal frames

刚架的形式及特点

Form and characteristics of rigid frame

1、采用轻型屋面，不仅可减小梁柱截面尺寸，基础也相应减小。

1. The use of light roof can not only reduce the section size of beam and column, but also reduce the foundation accordingly.

2、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。

2. In multi span buildings, a large double slope roof with one ridge can be made, which creates conditions for long slope drainage. Setting the middle column can reduce the span of the beam, so as to reduce the cost. The middle column adopts the upper and lower hinged swing column made of steel pipe, which occupies a small space.

3、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。

3. The lateral stiffness of the rigid frame is guaranteed by the support of purlins, the longitudinal rigid members are omitted, and the flange width is reduced.

4、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。

4. The rigid frame can adopt variable section, and the section is proportional to the bending moment; When changing the section, the height and thickness of the web and the width of the flange can be changed as needed to make the best use of the material.

5、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。

5. The web of the rigid frame can be designed according to the effective width, that is, partial web instability is allowed, and its post buckling strength can be used.

6、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。

6. Vertical load is usually the design control load, but when the wind load is large or the house is high, the role of wind load should not be ignored. In the light roof portal frame, the seismic action generally does not play a control role.

7、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。

7. The support can be made lighter. It can be connected to the web directly or with horizontal gusset plate, and tensioned round steel can be used.

8、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。

8. All structural members can be made in the factory with a high degree of industrialization. The component units can be divided according to the transportation conditions. The units are connected by bolts on site, which is convenient and fast for installation and small for civil construction.

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