CN102330470B - Single-layer prestressing frame structure - Google Patents

Abstract

The invention discloses a single-layer prestressed frame structure, which includes fixedly connected beams and columns, and is characterized in that: a corner bracing system is arranged at the diagonal line inside the connection point of the beam and the column; String tension system composed of 2 "T" type braces and 1 prestressed cable. Because the present invention adopts the prestressing technology, the internal force of the frame is evenly distributed, the frame can span a relatively large economic span, and the anti-seismic performance of the structure is improved, which is suitable for single-layer light steel structures.

Description

A single-story prestressed frame structure

technical field

The invention belongs to the technical field of building structures, and relates to a large-span prestressed frame structure, more specifically, to a single-layer prestressed frame structure.

Background technique

即梁跨中挠度与跨度成四次方增长。作为常用的工字形梁，其惯性矩近似为即惯性矩与梁高成二次方增长。换句话说，传统框架要想跨越较大跨度，为了确保梁跨中挠度满足规范要求，梁截面需要与跨度成平方增长。因此，传统框架能够跨越的经济跨度受到很大限制。The production and installation technology of steel frame structure is mature, so it has a wide range of applications. However, since the horizontal beam is a circuitous force-bearing member, the general relational expression of its mid-span deflection is

That is, the mid-span deflection grows with the span as the fourth power. As a commonly used I-shaped beam, its moment of inertia is approximately That is, the moment of inertia increases quadratically with the beam height. In other words, if the traditional frame wants to span a large span, in order to ensure that the mid-span deflection of the beam meets the code requirements, the beam section needs to grow squarely with the span. As a result, the economic span that traditional frameworks can span is severely limited.

On the other hand, the distribution of the main internal force (bending moment) of the traditional frame structure is very uneven no matter under the action of vertical load or horizontal load. The unevenness becomes more pronounced. The section of the component is designed according to the maximum internal force, so the material used for the traditional frame is very uneconomical.

Contents of the invention

Technical problem: The purpose of this invention is to overcome the above-mentioned shortcomings of uneven internal force distribution in the traditional frame, and to provide a single-layer prestressed frame structure by using prestressing technology to enable the frame to span a large economic span.

Technical scheme: in order to achieve the above object, the technical scheme adopted by the present invention to solve technical problems is:

A single-layer prestressed frame structure, including fixedly connected beams 12 and columns 11, and a corner bracing system is provided at the diagonal position inside the connection point of the beams 12 and columns 11, and the corner bracing system consists of "T" Type strut 22 and prestressed cable 21, wherein the lower end of the "T" type strut 22 is fixedly connected to the connection point between the beam 12 and the column 11, and the upper end of the "T" type strut 22 is provided with a hole center The axis of the line and the axis of the beam 12 and the axis of the column 11 are in a through hole on the same plane, and one end of the prestressed cable 21 is fixedly connected to a quarter of the beam 12 through the through hole, and the other end is fixedly connected to the At the foot of the column 11; under the beam 12, there is also a tensioning system consisting of two "T"-shaped struts 32 and a prestressed cable 31, wherein the "T"-shaped strut 32 are respectively installed at a quarter of the lower plane of the two ends of the beam 12, the lower end of the "T"-shaped strut 32 is fixedly connected to the lower plane of the vertical beam 12, and the upper end of the "T"-shaped strut 32 A through hole is opened with the center line of the hole in the same plane as the axis of the beam 12 , the prestressed cable 31 passes through the through hole, and the two ends are respectively fixedly connected to the connection points of the beam 12 and the column 11 .

The beams 12 and columns 11 mentioned above are made of steel.

The above-mentioned "T"-shaped struts 22 and "T"-shaped struts 32 are made of steel pipes.

The above-mentioned prestressed stay cables 21 and prestressed stay cables 31 are any one of steel wire ropes and steel strands.

The optimal angle between the prestressed stay cables 21 in the above-mentioned corner brace system and the axis of the beam 12 and the axis of the column 11 is 30-60 degrees.

The optimal angle between the prestressed cable 31 and the axis of the beam 12 in the string tensioning system under the beam mentioned above is 30-60 degrees.

Beneficial effect: compared with the prior art, the present invention has the following advantages and effects:

1. Improve the internal force distribution of the traditional frame structure, make the internal force distribution relatively uniform, so as to realize the saving of structural materials. Corner bracing system and under-beam tensioning system are all external prestressing technologies. By pre-applying a prestressing force opposite to the external load, the peak value of the internal force of the structure in the service state is reduced, or the peak value of the internal force is adjusted to other internal forces. part, to achieve uniform internal force. In the state of relatively uniform internal force, each part of the component can give full play to the performance of the material, and the economic and technical indicators are better.

2. Enable the traditional frame structure to achieve a larger economic span. The design of a single-story frame structure with a large span is often controlled by wind loads. In order to meet the deflection requirements specified in the code, the section of the member must be greatly increased, or the span shall be limited to a very limited range, generally not exceeding 15m. However, large-scale public buildings such as exhibition halls and museums require a span of far more than 15m, and even the larger the better. Prestressing technologies such as the corner brace system and the under-beam tensioning system, on the one hand, are equivalent to providing intermediate elastic support for traditional frame members, and on the other hand, as mentioned above, they adjust the distribution of internal forces, thus greatly increasing the economic span that the frame can span , can reach more than 60m.

3. Improve the seismic performance of the structure, which is conducive to the reinforcement of the damaged structure. The implementation of prestressing technology effectively reduces the structural materials, so the overall quality of the structure decreases. Once an earthquake occurs, the inertial force generated by the earthquake also decreases simultaneously. In other words, the invention improves the seismic performance of the structure. On the other hand, even if the structure is damaged under the rare external action, since the prestressing of the invention belongs to the external technology, it is easy to replace or reinforce.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Figure 2 is an enlarged view of the section of node A in Figure 1;

Fig. 3 is an enlarged view of the section of node B in Fig. 1;

Fig. 4 is a schematic structural diagram of Example 2 in the specific embodiment of the present invention.

In the figure: 11. column; 12. frame beam; 21. prestressed cable; 22. "T" type brace; 31. prestressed cable; 32. "T" type brace.

Detailed ways

The technical solution of a single-layer prestressed frame structure of the present invention will be described in further detail below through embodiments in conjunction with the accompanying drawings.

Example 1

As shown in Figure 1, Figure 2 and Figure 3, a single-story prestressed frame structure with a structural span of more than 40m consists of columns 11, beams 12, corner bracing systems and string tension systems. The columns 11 and beams 12 are welded and connected by H-shaped steel to form a frame. A corner bracing system is provided at the inner diagonal position of the connection point of the column 11 and the beam 12, and the corner bracing system is composed of a "T"-shaped brace 22 and a prestressed cable 21, and the "T"-shaped brace 22 is composed of Two round steel pipes are intersected and welded, and the prestressed stay cables 21 are steel wire ropes. The lower end of the "T"-shaped strut 22 is fixedly connected to the connection point between the beam 12 and the column 11, and the upper end of the "T"-shaped strut 22 is provided with a center line that is aligned with the axis of the beam 12 and the axis of the column 11. A plane through hole, the prestressed cable 21 passes through the through hole, one end is fixedly connected to a quarter of the beam 12 , and the other end is fixedly connected to the column foot of the column 11 . The included angle between the prestressed cable 21 and the axis of the beam 12 and the axis of the column 11 is 30 degrees.

The lower part of the beam 12 is also provided with a string tension system consisting of two "T"-shaped struts 32 and a prestressed cable 31. The "T"-shaped struts 32 are intersecting welded by two round steel pipes. Formed, the prestressed stay cable 31 is a steel wire rope. The two "T"-shaped struts 32 are respectively installed at a quarter of the lower plane of the two ends of the beam 12, and the lower ends of the "T"-shaped struts 32 are fixedly connected to the lower plane of the beam 12. The upper end of the "T"-shaped strut 32 is provided with a through hole whose hole center line is on the same plane as the axis of the beam 12. The prestressed cable 31 passes through the through hole, and the two ends are respectively connected with the beam 12 and the column 11. Click on the fixed connection. The angle between the two ends of the prestressed cable 31 and the axis of the beam is 30 degrees.

Example 2

The structural span is between 15m and 40m, and the string tension system under the beam in Embodiment 1 can be omitted, which can be specifically implemented according to the following scheme:

As shown in Figure 4, a single-layer prestressed frame structure is composed of columns 11, beams 12 and corner bracing systems. The columns 11 and beams 12 are welded and connected by H-shaped steel to form a frame. A corner bracing system is provided at the diagonal line inside the connection point of the beam 12 and the column 11, and the corner bracing system is composed of a "T" type brace 22 and a prestressed cable 21. The "T" type brace 22 is formed by intersecting welding of two circular steel pipes, and the prestressed stay cable 21 is a steel wire rope. The lower end of the "T"-shaped strut 22 is fixedly connected to the connection point between the beam 12 and the column 11, and the upper end of the "T"-shaped strut 22 is provided with a center line that is aligned with the axis of the beam 12 and the axis of the column 11. A plane through hole, the prestressed cable 21 passes through the through hole, one end is fixedly connected to a quarter of the beam 12 , and the other end is fixedly connected to the column foot of the column 11 . The included angle between the prestressed cable 21 and the axis of the beam 12 and the axis of the column 11 is 30 degrees.

Preferred embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings, but those of ordinary skill in the art can recognize that the aforementioned embodiments are only intended to illustrate the structural features and advantages of the present invention, rather than limit the present invention, so All changes or modifications made according to the concept of the present invention shall fall within the scope defined by the appended claims.

Claims (5)

1. individual layer prestressed frame structure, comprise the beam (12) and the post (11) that are fixedly connected with, it is characterized in that: the inboard diagonal positions of the tie point of described beam (12) and post (11) also is provided with a corner support system, described angle brace system is comprised of T-shape strut (22) and prestressed cable (21), the lower end of wherein said T-shape strut (22) contact that is connected with post (11) with beam (12) is fixedly connected with, the axis of porose heart line and beam (12) is offered in the upper end of described T-shape strut (22) and the axis of post (11) is in conplane through hole, described prestressed cable (21) passes 1/4th places that through hole one end is fixedly connected on described beam (12), the other end is fixedly connected on the suspension column place of described post (11), the below of described beam (12) also is provided with a string system that is comprised of two T-shape struts (32) and a prestressed cable (31), wherein said T-shape strut (32) is arranged on respectively two ends lower plane 1/4th places of described beam (12), the lower plane of the lower end vertical beam (12) of described T-shape strut (32) is fixedly connected with, the axis that porose heart line and beam (12) are offered in the upper end of described T-shape strut (32) is in conplane through hole, described prestressed cable (31) passes through hole, two ends are distinguished the contact that is connected with post (11) with beam (12) separately and are fixedly connected with.

2. a kind of individual layer prestressed frame structure according to claim 1 is characterized in that: the T-shape strut (22) in described angle brace system and the material of the T-shape strut (32) in a string system are steel pipe.

3. a kind of individual layer prestressed frame structure according to claim 1 is characterized in that: the prestressed cable (21) in described angle brace system and the prestressed cable (31) in a string system are any in wire rope, steel strand.

4. a kind of individual layer prestressed frame structure according to claim 1 is characterized in that: the prestressed cable (21) in described angle brace system respectively and the angle between the axis of the axis of beam (12) and post (11) be 30～60 degree.

5. a kind of individual layer prestressed frame structure according to claim 1 is characterized in that: the angle between the prestressed cable (31) in described string system and the axis of beam (12) is 30～60 degree.

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