CN201406758Y - A light steel portal frame - Google Patents

Abstract

A light steel portal frame of the utility model is composed of ordinary side columns, Y-shaped center columns, herringbone beams and prestressed cables. Among them, the column head of the Y-shaped central column is hingedly connected with the herringbone beam, and the angle between its branches and the horizontal line is 30°~60°; Some of them are equal-section beams; the prestressed cables are made of high-strength round steel, and the two ends are hingedly connected with the Y-shaped central column and the herringbone beam respectively. In the middle of the cable, a positive and negative buckle sleeve is used to apply prestress. Theoretical and numerical analysis shows that the Y-shaped center column and prestressed cables effectively reduce the bending moment of the mid-span of the girder beam and the mid-span bending moment, so that the bending moment of the girder beam is evenly relieved, and the mid-span deflection of the girder is effectively reduced. Therefore, the light steel portal frame is especially suitable for large space structures with a span of more than 30m.

Description

A light steel portal frame

technical field

The utility model belongs to the technical field of building structures, and more specifically relates to a light steel portal frame for buildings.

Background technique

Light steel portal frames are widely used in factories, warehouses, supermarkets and other buildings that require large space.

The traditional light steel portal frame is generally applied to the span of 15m to 30m, which is more economical. For a portal frame with a larger span, the stress distribution will be very unbalanced under load, but the section can only be selected according to the maximum stress during design, so the stress in most parts is not full; and the beam deflection of the larger-span structure It often becomes a controlling index. The traditional portal frame can only increase the rigidity of the structure by increasing the section of the member to meet the deflection requirements. The above reasons cause a large waste of materials and are very uneconomical. Therefore, the application of traditional light steel portal frame to buildings with larger spans will greatly reduce its advantages of "light steel".

Contents of the invention

The purpose of this utility model is to solve the deficiencies in the above-mentioned prior art, so that the light steel portal frame can be adapted to buildings with larger spans, which not only meets the deflection and strength requirements of larger spans, but also maintains its "light steel" advantage, and provide a new type of light steel portal frame.

In order to achieve the above purpose, a light steel portal frame of the present invention is composed of ordinary side columns 1, herringbone beams 3, Y-shaped center columns 2 and prestressed cables 4.

Wherein, the Y-shaped central column 2 is generally branched at the same height as the column head of the ordinary side column 1, and the angle between the branch and the horizontal line is between 30° and 60°, and the column head and the herringbone beam are hinged by bolts. connect.

The prestressed cable 4 is made of high-strength round steel, and the two ends are hingedly connected with the herringbone beam 3 and the Y-shaped center column 2 respectively. Prestressing can be applied in the middle of the prestressing cable 4 by using a front and back buckle sleeve, and when the structural span is less than 36m, the prestressing cable can be canceled.

The herringbone beam 3 adopts a two-stage variable-section member, the part close to the common side column 1 adopts a wedge-shaped variable-section beam, and the middle part adopts a constant-section beam. The ordinary side column 1 and the Y-shaped central column 2 can be connected to the foundation by hinges or by rigid connections.

The common side column 1 and the herringbone beam 3 are rigidly connected.

The technical gist of the utility model lies in the Y-shaped central column and the prestressed cable. The Y-shaped central column is equivalent to adding an elastic support in the middle of the herringbone beam, and the prestressed cable uses the principle of the support displacement method to adjust the herringbone. Beam mid-span bending moments and deflections.

Theoretical and numerical analysis shows that the utility model is a new type of light steel portal frame, which can adjust the branching angle of the Y-shaped central column and the initial tension of the prestressed cable according to the structural span, external load, cornice height, etc., reasonable The branching angle and the optimized initial tension of the cables will effectively reduce the bending moment of the mid-span of the herringbone beam and the mid-span bending moment, so that the bending moment of the herringbone beam can be evenly relaxed, and at the same time, the mid-span deflection of the beam can be effectively reduced. Therefore, the new lightweight The steel portal frame is especially suitable for large space structures with a span of more than 30m, so that the traditional light steel portal frame can be extended and applied to buildings with larger spans.

The technical content of the utility model will be further described below in conjunction with accompanying drawings and examples, but the following examples are only examples of the utility model, and do not represent the limited scope of rights protection of the utility model, the rights of the utility model The scope of protection is determined by the claims.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structural representation of prestressed stay cable 4;

In the figure, 1. Ordinary side column; 2. Y-shaped central column; 3. Herringbone beam; 4. Prestressed cable.

Detailed ways

As shown in Figure 1, a light steel portal frame of the present invention is a two-span structure, which is composed of ordinary side columns 1, Y-shaped center columns 2, herringbone beams 3 and prestressed cables 4.

Ordinary side column 1, Y-shaped central column 2 and herringbone beam 3 are made of high-frequency welded H-shaped steel, and prestressed cables 4 are made of high-strength round steel.

The branching position of the Y-shaped central column 2 is at the same height as the column head of the side column 1, and the angle between the branching and the horizontal line is 30°. The Y-shaped central column 2 is first manufactured in the steel structure processing factory, and it is installed as a whole after it arrives at the site. The herringbone beam 3 is hingedly connected by bolts.

As shown in FIG. 2 , prestressing is applied in the middle of the prestressing cable 4 with a front and back buckle sleeve, and the two ends of the prestressing cable 4 are respectively connected to the herringbone beam 3 and the Y-shaped central column 2 by bolts.

The herringbone beam 3 adopts two-stage variable-section members. The wedge-shaped variable-section beam is used near the ordinary side column 1, and the constant-section beam is used near the Y-shaped central column 2. The length of the constant-section beam is three times the length of the wedge-shaped variable-section beam.

Ordinary side column 1, Y-shaped central column 2 are hingedly connected to the foundation; ordinary side column 1 and herringbone beam 3 are rigidly connected.

Claims (5)

1. A light steel portal frame, characterized in that: the portal frame is composed of at least two spans, and it includes common side columns (1), Y-shaped central columns (2), herringbone beams (3) and Prestressed cables (4). 2. A light steel portal frame according to claim 1, characterized in that: said Y-shaped central column (2) is branched at the same height as the ordinary side column (1), forming a Y-shaped , the angle between the branch and the horizontal line is 30°-60°, and the Y-shaped central column (2) and the herringbone beam (3) are hingedly connected by bolts. 3. A light steel portal frame according to claim 1, characterized in that: the prestressed cables (4) are made of high-strength round steel, and one or both ends are prestressed by tightening nuts, Prestressing can also be applied in the middle of the prestressed cable (4) with a positive and negative buckle sleeve, and the two ends of the prestressed cable (4) are respectively connected to the herringbone beam (3) and the Y-shaped center column (2) by bolts. . 4. A light steel portal frame according to claim 1, characterized in that: the herringbone beam (3) is a two-section member with variable cross-section, and the part close to the ordinary side column (1) adopts a wedge-shaped deformation cross-section beams, and the middle part is a constant-section beam; ordinary side columns (1) and herringbone beams (3) are rigidly connected. 5. A light steel portal frame according to claim 1, characterized in that: the connection between the ordinary side column (1) and the Y-shaped center column (2) and the foundation is a rigid connection or a hinged connection.

Images