CN106436903B - Light gauge cold-formed steel shape house interlayer strengthening part - Google Patents

Abstract

A cold-formed thin-walled steel building interstory strengthening component, characterized in that the strengthening component is a truss structure: it includes four upright steel casings (4) arranged in a rectangular projection, fixed on two steel casings (4) end and coaxial with the steel casing (4) hollow support (5), between the adjacent hollow support (5) welded with horizontal transverse reinforcement (6) or horizontal longitudinal reinforcement (7), in the horizontal transverse reinforcement ( 6) On the hollow supports (5) at the four corners of the front and rear side walls formed by the steel casing (4), oblique steel bars (1) of equal length are welded along the diagonal direction, and each oblique steel bar (1) The far end of the reinforcing bar (1) is welded on a perforated steel plate (2). On the steel casing (4), reinforcement hoops (3) are welded between phases. The reinforcement component is suitable for cold-formed thin-walled steel buildings with beam-column structures in multi-storey buildings. The force transmission path is direct and reliable, and can significantly improve the overall structure's lateral resistance and ability to withstand vertical loads.

Description

Cold-formed thin-walled steel building interstory reinforcement components

technical field

The invention relates to a cold-formed thin-walled steel building interlayer truss-type strengthening part, which is especially suitable for being installed in low-rise and multi-layer layered assembled cold-formed thin-walled steel structure buildings, and belongs to the technical field of construction engineering.

Background technique

The main construction materials used in cold-formed thin-walled steel houses can be recycled and reused at a rate of more than 90%. The load-bearing composite wall is usually composed of cold-formed thin-walled steel wall frame columns, inner filling insulation cotton and outer covering gypsum board, etc. , easy to achieve resource recycling; wall panels have good thermal insulation properties, reduce energy consumption during use, and meet national green environmental protection requirements; the structure is light, high-strength, and its weight is only 1/4-1/3 of the concrete frame structure , its structure and basic materials are greatly reduced, and the earthquake effect is also greatly reduced; the main components of the wall frame column are processed in the factory and then transported to the site for assembly.

In view of the green ecological characteristics of cold-formed thin-walled steel houses and the advantages of easy realization of construction industrialization, my country has begun to introduce a large number of residential buildings of this system in recent years, especially low-rise houses built after the Wenchuan earthquake. Industry insiders have conducted a lot of experimental research and finite element analysis on the shear performance of composite walls under unidirectional and reciprocating loads, and obtained that the wall has good bearing performance, and the failure is mostly caused by the failure of wall panels and self-tapping screws. Mainly, there is no damage to the internal wall frame columns; domestic 2-3 storey overall houses have been subjected to full-scale model shaking table tests under strong earthquakes, which show that the houses with this structural system have excellent seismic performance, and most of the structures are cracked and damaged by wall panels. Self-tapping screws mainly fall off, and continuous collapse will not occur. Comprehensively considering the characteristics of construction technology, structural force, force transmission between parts, and multiple members of the system, the current assembly method is to assemble the wall frame columns of each floor into wall sections in the factory and then transport them to the site for assembly, forming the "low-rise cold-formed thin According to the method of floor connection recommended by Wall-shaped Steel Building Construction Technical Specifications (JGJ227-2011), when the horizontal seismic action on the wall is simplified at the top of the wall, the wall will rotate and slip. The anti-uplift anchor bolts are set at the bottom of the section and the support at the bottom of the wall to resist the external load. It is difficult to meet people's requirements for multi-functional buildings in low-rise buildings, and it is also difficult to cope with the objective national conditions of China's large population and small land, and tight housing land. There is an urgent need to apply this type of system to multi-storey buildings. However, when the structural system is used in a multi-storey building, as the number of floors increases, the pressure on the walls of the lower floors will increase, and the shear force generated by the earthquake on each floor will also increase. The method of discontinuity is always the bottleneck factor that restricts the development of the system to multiple high-rises, and it is urgent to take strengthening measures to improve the collaborative work ability between the upper and lower wall sections.

Chinese patent ZL201210564012.8 discloses a cold-formed thin-walled steel beam-column structure system for a multi-storey house, including a reinforced concrete ground beam (1), in which a vertical column is fixed, and each column Beams perpendicular to the column are fixed on the top, and each beam is parallel to each other. It is characterized in that: the column is a rectangular steel pipe column (2); the beam is a cold-formed thin-walled C-shaped steel beam bent into an "L" shape (4); There is a cold-formed thin-walled angle steel (5) fixed at the same height above each rectangular steel pipe column (2), and another cold-formed thin-walled angle steel (5) is fixed on each rectangular steel pipe column (2) ) below the same height, the bending part of the "L" shaped cold-formed thin-walled C-shaped steel beam (4) is embedded in the cavity, and part or all of the cavity of the rectangular steel pipe column (2) is filled with sand and pebbles (3 ). In this patented technology, the columns of the inner wall are vertically continuous, and double-angle steel is used to strengthen the floor. The force transmission path is direct and reliable, which can improve the lateral resistance of the house. This method is used for the inner wall. However, when it is applied to the exterior wall, the existence of the angle steel makes it difficult to install the exterior wall panel, and there are certain technical defects, and there are a large number of self-tapping screws to connect the floor beam and the wall, and the splicing needs of the wall frame column interface. On-site processing, promotion and application are limited.

Contents of the invention

The purpose of the present invention is to design a kind of direct and reliable force transmission path, which can significantly improve the overall lateral resistance capacity of the structure and the ability to withstand vertical loads, and is suitable for interlayer reinforcement components of cold-formed thin-walled steel buildings in multi-storey building beam-column structures. .

Concrete technical scheme of the present invention is:

A cold-formed thin-walled steel building interstory strengthening component, which is characterized in that the strengthening component is a truss structure: it includes four upright steel casings arranged in a rectangular projection, fixed at both ends of the steel casing and connected with the steel casing Coaxial hollow supports, horizontal transverse steel bars or horizontal longitudinal steel bars are welded between adjacent hollow supports, on the hollow supports at the four corners of the front and rear side walls formed by horizontal transverse steel bars and Diagonal steel bars of equal length are welded in the diagonal direction, and the far end of each oblique steel bar is welded on a perforated steel plate.

A further scheme is: on the steel casing, reinforcing hoops are welded alternately.

A further solution is: the perforated steel plate has a vertical elliptical hole, the major axis of the ellipse is the vertical axis, the minor axis is the horizontal axis, and the ratio of the length of the major axis to the minor axis is 2:1-4:1.

In the present invention:

The truss is a space three-dimensional truss, the diameter of the horizontal and transverse reinforcement can be 20mm, the diameter of the horizontal longitudinal reinforcement and the oblique reinforcement can be 16mm, and all the reinforcement is welded to the hollow support at the end of the steel casing by welding, and the horizontal and transverse reinforcement is selected The larger diameter is to improve the torsion resistance of the interlayer reinforcement.

The strength of the perforated steel plate is preferably Q235B structural steel, the wall thickness is 10mm, the length of the major axis of the ellipse is 20-40mm, the length of the minor axis is 10mm, and the clear distance between the holes is 20mm. The steel bar and the perforated steel plate are connected by fillet welds. This structure It can significantly improve the energy dissipation capacity of the floor joints, shorten the calculated length of the steel bar, and restrain the out-of-plane instability of the steel bar.

The advantages of the present invention are:

Relying on the space truss strengthening components placed between the top and bottom beams at the connection of floors, it can partly bear the horizontal and vertical loads, and improve the resistance capacity of the weak parts at the connection of floors; Building Construction Technical Specifications (JGJ227-2011) recommended that each section should be set with a single piece to be set with two pieces for each section, so as to improve the force transmission capacity of the pullout anchor bolts and avoid the self-tapping screws on the pullout pieces when transmitting vertical loads. It is sheared and improves the ability to resist out-of-plane instability; the inter-story reinforcement parts are produced in a factory and used in conjunction with the anti-lift anchor bolts at the connection of the floors. The on-site installation speed is fast, and the system can be applied to cold-formed thin-walled steel In structural houses, a multi-layer structure system that is assembled in layers and easy to implement building industrialization is formed; without changing the method of floor joints recommended in the "Technical Code for Buildings with Low-rise Cold-Formed Thin-walled Steel Buildings", the relevant design methods stipulated in the code still have certain Applicability, suitable for building industrialization. The single-layer wall section wall frame columns can be shipped to the site for assembly after being processed in the factory, and the construction speed is fast; the reinforcement parts are in the form of space trusses, which are low in cost, light in weight, easy to install, and will not increase significantly. The comprehensive cost of the house and the weight of the house have strong applicability.

After the inter-story structure is strengthened at the connection between the floors, the force-transmitting parts are increased into three parts, and then transmitted to the top beam of the lower wall, which can significantly improve the overall lateral resistance of the structure and the ability to withstand vertical loads.

The reinforced components of the interstory trusses are produced in a factory, and are used in conjunction with the uplift anchor bolts at the joints of the floors. No additional connectors are added, and the on-site installation speed is fast, which solves the problem of applying this structural system to multi-storey cold-formed thin-walled steel buildings. The key problem of this problem is that the weight of the house will not be significantly increased, and the earthquake effect will not be increased. The connection is in an elastic state under the action of static load, and the strengthening parts can improve the rigidity of the structure. The perforated steel plate begins to consume energy, which can protect the steel bar from premature buckling failure, so the seismic effect is good; under the action of wind load, the reinforced parts of the interstory truss can significantly improve the structural damping and reduce the acceleration of the structure; after the building is demolished, the first floor The inter-truss reinforcement components are easy to remove, they can still be used, and they are installed in the plane of the wall without affecting the appearance of the building.

Description of drawings

Figure 1 is a three-dimensional schematic diagram of an interlayer truss-type reinforcement component.

Fig. 2 is a three-dimensional schematic diagram of the wall assembly of the cold-formed thin-walled steel house in the present invention.

Fig. 3 is a three-dimensional schematic diagram of the steel casing and its components in the present invention.

Fig. 4 is a three-dimensional schematic diagram of the anti-pullout member in the present invention.

Fig. 5 is a three-dimensional schematic diagram of the pullout anchor bolt and its components in the present invention.

In the figure: 1-diagonal reinforcement, 2-opening steel plate, 3-reinforcing hoop, 4-steel casing, 5-hollow support, 6-horizontal transverse reinforcement, 7-horizontal longitudinal reinforcement, 8-lower column, 9 -Floor beam, 10-Self-tapping screw, 11-Top beam, 12-Strengthening piece, 13-Anti-pull piece, 14-Anti-pull anchor bolt, 15-Bolt hole, 16-Washer, 17-Bottom beam, 18- Upper column, 19-nut.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings.

As shown in Fig. 1, a kind of cold-formed thin-walled steel building interstory strengthening component is characterized in that the strengthening component is a truss structure: it includes four upright steel sleeves 4 arranged in a rectangular projection, and is fixed on two sides of the steel sleeves 4. The hollow support 5 with the end and coaxial with the steel sleeve 4, the horizontal transverse steel bar 6 or the horizontal longitudinal steel bar 7 is welded between the adjacent hollow support 5, and the front and rear sides formed by the horizontal transverse steel bar 6 and the steel sleeve 4 On the hollow supports 5 at the four corners of the wall, oblique steel bars 1 of equal length are welded along the diagonal direction, and the far end of each oblique steel bar 1 is welded on a perforated steel plate 2 .

On the steel casing 4, reinforcing hoops 3 are welded between phases.

There are 3 vertical elliptical holes in the perforated steel plate 2, the major axis of the ellipse is the vertical axis, the minor axis is the horizontal axis, and the length of the major axis is 40mm, the length of the minor axis is 10mm, and the net distance between the holes is 20mm

Fig. 2, Fig. 3, Fig. 4 and Fig. 5 are examples of cold-formed thin-walled steel building interstory strengthening components applied to cold-formed thin-walled steel beam-column structures of multi-storey buildings.

Includes beams and columns that cooperate with each other:

The column is composed of two C-shaped steels that are attached back to back and fixed with self-tapping screws 10, including the lower column 8 and the upper column 18;

The beams include a C-shaped steel floor beam 9, which connects the U-shaped steel top beam 11 of the lower building with the opening downwards of two adjacent columns and the U-shaped steel bottom beam 17 of the upper building with the opening upward;

And: there is an anti-pull piece 13 consisting of a bottom plate, a back plate and a side plate, the bottom plate is provided with bolt holes 15, and the back plate is provided with self-tapping screw holes;

C-shaped steel stiffeners 12 are available;

A connecting piece consisting of an anti-lift anchor bolt 14, a washer 16 and a nut 19 is provided;

Holes corresponding to the bolt holes 15 are provided on the top beam 11, and holes corresponding to the bolt holes 15 are provided on the bottom beam 17;

The opening of the top beam 11 is slightly larger than the width of the lower column 8, and the tops of two adjacent lower columns 8 are embedded in the downward opening of the top beam 11 and fixed by self-tapping screws 10;

There is also a pull-out member 13 connected between the inner wall of the lower column 8 and the top beam 11, wherein the back plate of the pull-out member 13 and the lower column 8 are fixed with self-tapping screws 10, and the bottom plate of the pull-out member 13 is close to the roof beam 11 And the holes on the top beam 11 overlap with the bolt holes 15;

The floor beam 9 is fixed on the top beam 11 by self-tapping screws 10, and the bottom beam 17 is fixed on the floor beam 9 by self-tapping screws 10;

The opening of the bottom beam 17 is slightly larger than the width of the upper column 18, and the bottoms of two adjacent upper columns 18 are embedded in the upward opening of the bottom beam 17 and fixed by self-tapping screws 10;

There is also a pull-out member 13 connected between the inner wall of the upper column 18 and the bottom beam 17, wherein the back plate of the pull-out member 13 and the upper column 18 are fixed with self-tapping screws 10, and the bottom plate of the pull-out member 13 is close to the bottom beam 17 And the holes on the bottom beam 17 overlap with the bolt holes 15;

The truss-type reinforcement component is installed between the top beam 11 and the bottom beam 17, and the uplift anchor bolt 14 passes through the bolt hole 15, the top beam 11, the steel casing 4, and the bottom beam 17, and then passes through the gasket 16 and the nut 19 fixed to each other.

Wherein: on the steel casing 4, reinforcing hoops 3 are welded between phases. Stiffeners 12 are also attached back to back to the inner walls of the floor beams 9 , and the stiffeners 12 are fixed on the floor beams 9 with self-tapping screws 10 .

The oblique steel bar 1 and the perforated steel plate 2 are preferably welded through fillet welds.

Install the interstory truss reinforcement components to the first span at the end of the wall, and then arrange the spans; the installation sequence is: after the keel of the bottom wall section and the foundation are fixed, the floor beam 9 is fixed to the U-shaped top of the bottom layer by self-tapping screws 10 On the beam 11, the floor stiffener 12 is connected to the floor beam 9 with self-tapping screws 10, and the pullout anchor bolt 14 is passed through the bolt hole 15 of the bottom pullout piece 13, and then passed through and placed on the bottom U-shaped roof. After the gasket 16 on the upper surface of the beam 11, the pullout anchor bolt 14 passes through the steel casing 4, then the gasket 16 is placed after passing through the U-shaped bottom beam 17 on the top floor, and the upper and lower nuts 19 are tightened to complete the installation of the interlayer reinforcement components. The installation of the floor wall section is also completed.

The steel casing 4 can be made of seamless steel pipe with a wall thickness of 3mm, and its diameter is 20mm, which is convenient for the anti-lift anchor bolt 14 to pass through; The thickness is 5mm, and local reinforcement is carried out to avoid local instability of the steel casing 4; the hollow support 5 is welded to the end of the steel casing 4 to avoid tearing along the end or local extrusion damage when the load is applied; and the steel casing 4. The anti-uplift anchor bolt 14 has the function of constraining deformation after buckling under compression, forming the effect of constraining buckling support, and can restrain the buckling failure of the anti-uplift anchor bolt 14 under compressive action.

In order to improve the force transmission capacity of the anti-uplift anchor bolt 14, avoid the self-tapping screw 10 on the anti-uplift member 13 from being sheared when transmitting a vertical load, and improve the ability to resist out-of-plane instability. The number of uplift anchor bolts 14 is increased from a single one for each section recommended by the design code to two for each section, and two bolt holes are opened on the bottom plate of the corresponding anti-uplift member 13, and the anti-uplift member 13 adopts three rows of automatic bolts. Tapping screws 10 are attached to the wall studs.

Interstory truss reinforcement components can be arranged at intervals.

Claims (3)

1. a kind of light gauge cold-formed steel shape house interlayer strengthening part, which constructs for truss-like, it is characterised in that truss Formula construction includes：It is projected as four upright steel sleeves of rectangular arrangement（4）, it is fixed on steel sleeve（4）Both ends and and steel sleeve （4）Coaxial hollow bearing（5）, adjacent hollow bearing（5）Between be welded with horizontal cross reinforcing bar（6）Or horizontal longitudinal reinforcement （7）, in horizontal cross reinforcing bar（6）With steel sleeve（4）The hollow bearing at four angles of the front and rear sides wall of composition（5）On, equal edge Diagonal is welded with the oblique reinforcing bar of equal length（1）, every oblique reinforcing bar（1）Distal end be welded on an open pore steel plate （2）On.

2. light gauge cold-formed steel shape house interlayer strengthening part according to claim 1, it is characterised in that：Steel sleeve（4）On, It is alternate to be welded with Reinforced Hoop（3）.

3. light gauge cold-formed steel shape house interlayer strengthening part according to claim 1, it is characterised in that：Open pore steel plate（2） Vertical slotted eye is provided with, transverse is vertical axis, and short axle is lateral shaft, and the ratio between long axis and minor axis length are 2:1-4:1.