CN103195187A - Angle steel assembly type steel structure prestressed buckling-restrained brace - Google Patents

Abstract

The invention belongs to the technical field of building construction, and provides an angle steel assembly type steel structure prestressed buckling-restrained brace which comprises an internal energy dissipation inner core (2), external angle steel restraining components (3) and prestressed cables (4), a middle gap is reserved between the external angle steel restraining components (3) along the length direction, the internal energy dissipation inner core (2) is inserted into the middle gap of the external angle steel restraining components (3), transverse stiffening ribs (7) are arranged on two sides of each external angle steel restraining component (3) along the length direction, and the prestressed cables (4) are symmetrically disposed on two sides of the internal energy dissipation inner core (2) and pass through the transverse stiffening ribs (7). In order to make the internal energy dissipation inner core to perform axial deformation and energy dissipation, length of the internal energy dissipation inner core (2) is larger than that of each external angle steel restraining component (3), and two ends of the internal energy dissipation inner core (2) extend out of the external angle steel restraining components (3). Under the action of earthquakes, the angle steel assembly type steel structure prestressed buckling-restrained brace dissipates energy sufficiently to enable structural inter-story displacement to be a minimum, and specification requirements are met.

Description

Prestressed anti-buckling bracing of angle steel assembled steel structure

technical field

The invention relates to a novel supporting structure form, in particular to an angle steel assembled steel structure prestressed anti-buckling support applied in the construction field.

Background technique

Due to its high stiffness, the traditional support usually yields when the tensile stress exceeds the elastic limit under strong earthquakes, resulting in irrecoverable residual deformation; when it is under compression, it is prone to compressive buckling. Under the repeated action of earthquakes, its energy dissipation effect is not great, and it is difficult to better protect the main structure from damage.

Buckling-resistant bracing members, as lateral-force energy-dissipating devices used in multi-story and high-rise structures, dissipate energy through the elastic-plastic properties of steel, and produce large residual deformations after major earthquakes. Excessive lateral deformation and residual deformation of structures caused by strong earthquakes are the direct cause of structural damage and collapse. In addition, traditional buckling-resistant braces also have many problems such as difficulty in controlling machining accuracy and heavy wet work workload caused by concrete peripheral restraint members.

Most of the existing supports and the main structure are connected by shear bolts, which cannot give full play to the mechanical properties of the bolts. The number of bolts is large, the site construction is inconvenient, and the structural cost is high.

In recent years, scholars at home and abroad have done little research on prestressed anti-buckling braces for steel structures, and have not really realized the industrialized rapid and integrated production of prestressed anti-buckling braces for steel structures.

Contents of the invention

The purpose of the present invention is to overcome the existing above-mentioned defects, and provide a novel prestressed anti-buckling support of steel structure assembled with angle steel, which can realize fast and reasonable installation of the main steel structure and supporting components. And it has a strong bearing capacity under small earthquakes. By increasing its initial tensile bearing capacity, it reduces or even eliminates its residual deformation under large earthquakes, and has a strong energy dissipation capacity.

In order to achieve the above object, the present invention adopts following technical scheme:

The prestressed anti-buckling bracing of steel structure with angle steel assembly includes three parts: internal energy-dissipating inner core, peripheral angle steel restraint members, and prestressed cables. It is characterized in that: the internal energy-dissipating inner core is a straight single-piece steel plate. In order to make the energy dissipation inner core easy to enter into the plastic energy dissipation, the middle part of the energy dissipation inner core board is weakened and has an arc shape. The end of the energy-dissipating inner core is connected side by side with two vertical connecting plates: an upper connecting plate and a lower connecting plate. The upper connecting plate has bolt holes, and is connected with the frame by high-strength bolts. There is a cavity with the same size as the cross-sectional size of the energy dissipation inner core in the surface of the lower connecting plate. Pass the energy-dissipating inner core through the lower connecting plate, push against the upper connecting plate, and weld the three together. The upper and lower connecting plates are welded together by double rows of upper and lower connecting plate stiffeners. The stiffeners of the upper and lower connecting plates are perpendicular to both plates. Both ends of the energy-dissipating inner core have exactly the same structure directly.

The peripheral angle steel constraining members are four angle steels, which are welded together with the backs of two limbs in an upside-down T-shape. The two T-shaped flanges are then bolted together. Or four angle steels are arranged in a cross shape, and the backs of opposite limbs are connected by bolts. Each bolt is sheathed with a casing, and the length of the casing is the same as the thickness of the energy-dissipating inner core. The sleeves are located between the backs of the bolted limbs. There are transverse stiffeners connected between the two limbs of each angle steel, and the distance between the transverse stiffeners is determined by calculation.

The prestressed cables pass through the transverse stiffeners, and the two ends are connected with the two lower connecting plates of the internal energy dissipation inner core. The connection point is located at the center of two adjacent short stiffener regions. The size of the prestress is determined by calculation.

In the factory, the internal energy-dissipating core, the peripheral angle steel restraint member and the prestressed cable are assembled and connected together. The prestressed anti-buckling support of the angle steel-shaped assembled steel structure is connected to the frame with high-strength bolts on site. When the horizontal force acts on the structure, the horizontal force component of the prestressed anti-buckling brace of the angle steel assembled steel structure reduces or even offsets the horizontal force acting on the structure, so that the interstory displacement of the structure is a small value, which meets the requirements of the code .

Beneficial effect

The invention adopts a channel steel assembled steel structure prestressed anti-buckling support that can realize rapid assembly and effectively resist horizontal lateral displacement during the construction stage. This form of support can not only effectively realize the industrialization of the processing of steel structural components, but also greatly increase the construction speed and greatly reduce the amount of steel used.

The prestressed anti-buckling support of the channel steel assembled steel structure is connected with the main structure by tension bolts, which can give full play to the mechanical properties of the bolts and reduce the structural cost.

The prestressing technology is introduced into the steel structure support. Under the action of small earthquake, the prestressed anti-buckling support member has great lateral stiffness; under the action of moderate earthquake or large earthquake, the prestressed anti-buckling support member It can realize the full yield of the whole section without the overall or local buckling failure of the supporting member, and reduce or eliminate the residual deformation of the energy-dissipating chip, so that the original energy-dissipating mode through the plastic hinge at the beam end of the main structure can be changed to only in the anti-corrosion Concentrate energy dissipation on the buckling support components, thereby better protecting the main structure.

The prestressed anti-buckling support member not only has a strong initial stiffness but also has a good energy dissipation effect. Through its own lateral resistance and energy dissipation, the cross-sectional size of the member can be reduced, and the structural cost can be reduced.

Description of drawings

Fig. 1 structural diagram of components of the present invention

The side view of Fig. 2 member of the present invention

Fig. 3 internal energy dissipation inner core diagram of the components of the present invention

Fig. 4 external angle steel constraining component diagram of the present invention

The prestressed cable diagram of Fig. 5 member of the present invention

Among them, 1- angle steel prestressed anti-buckling brace of assembled steel structure; 2- internal energy dissipation inner core; 3- external angle steel restraint member; 4- prestressed cable; 5- upper connecting plate; 6- lower connecting plate; 7 -transverse stiffener; 8-upper and lower connecting plate stiffener; 9-casing

Specific implementation

The implementation of the structural system will be described in detail below in conjunction with the accompanying drawings.

As shown in Figures 1-2, the present invention is an angle steel-shaped assembled steel structure prestressed anti-buckling support, which consists of three parts: an internal energy-dissipating inner core, peripheral angle steel restraint members, and prestressed cables. The internal energy-dissipating inner core is inserted into the intermediate space of the peripheral angle steel restraint members. The prestressed cables are arranged symmetrically on both sides of the energy-dissipating inner core, passing through the transverse stiffeners, and the number is determined by calculation. In order to make the inner energy-dissipating inner core axially deform and dissipate energy, the inner energy-dissipating inner core is longer than the outer frame constraining member by a distance D, and the value of D is determined by calculation.

As shown in Figure 3: the internal energy-dissipating inner core is a straight single-piece steel plate. In order to make the energy-dissipating inner core easy to enter into the plastic energy-dissipating, the middle part of the chip board is weakened, and it is arc-shaped. One end of the energy-dissipating inner core is two connecting plates perpendicular to it: an upper connecting plate and a lower connecting plate, which are vertically welded and connected to the energy-dissipating inner core. The uppermost connecting plate has bolt holes, and is connected with the frame by high-strength bolts. The upper and lower connecting plates are welded together by short stiffeners. The short stiffeners are perpendicular to both plates. The other end of the energy-dissipating inner core is directly welded to the bottom connection plate of the outer frame constraint member.

As shown in Figure 4: the peripheral angle steel constraining members are four angle steels, which are firstly welded together with their backs, forming an inverted T-shape. The two T-shaped flanges are then bolted together. Or four angle steels are arranged in a cross shape, and the backs of opposite limbs are connected by bolts. Each bolt is sheathed with a casing, and the length of the casing is the same as the thickness of the energy-dissipating inner core. The sleeve sits between the backs of the bolted limbs. There are transverse stiffeners connected between the two limbs of each angle steel, and the distance between the transverse stiffeners is determined by calculation.

As shown in Figure 5: both ends of the prestressed cable are connected to the two lower connecting plates of the internal energy-dissipating inner core. The prestressed size and quantity of the prestressed cables are determined by calculation.

Claims (4)

1. the anti-flexing of angle steel assembling type steel structure prestressing force supports, and it is characterized in that: comprise inner energy consumption inner core (2), outside angle steel confining part (3), prestressed cable (4); Outside angle steel confining part (3) alongst is provided with intermediate gaps, and inner energy consumption inner core (2) is inserted in the intermediate gaps of outside angle steel confining part (3); Outside angle steel confining part (3) both sides alongst are provided with transverse stiffener (7), and prestressed cable (4) is arranged symmetrically in inner energy consumption inner core (2) both sides, passes transverse stiffener (7); For making inner energy consumption inner core axial deformation power consumption, inner energy consumption inner core (2) length is greater than outside angle steel confining part (3), and stretch out outside the outside angle steel confining part (3) at inner energy consumption inner core (2) two ends.

2. the anti-flexing of a kind of angle steel assembling type steel structure prestressing force according to claim 1 supports, and it is characterized in that: described inner energy consumption inner core (2) is the yi word pattern single steel plate; For making energy consumption inner core (2) be easy to enter the plasticity power consumption, inner energy consumption inner core (2) middle part weakens, and is circular arc along its length; The vertical junction plate of inner energy consumption inner core (2) length direction: i.e. directly the upper junction plate (5) that is connected with inner energy consumption inner core (2) and the lower connecting plate (6) that is connected with upper junction plate (5), upper junction plate (5) and lower connecting plate (6 with vertical being welded to connect of energy consumption inner core (2); Lower connecting plate (6) is provided with bolt hole, is used for will preventing that with bolt flexing supports and framework links together; Upper junction plate (5) and lower connecting plate (6) are welded together by last lower connecting plate stiffening rib (8).Last lower connecting plate stiffening rib (8) is all vertical with junction plate; Energy consumption inner core (2) two ends structure is identical.

3. the anti-flexing of a kind of angle steel assembling type steel structure prestressing force according to claim 1 supports, and it is characterized in that: described outside angle steel confining part (3) is four angle steel, and limb welds together the T font that is being down back to it in twos earlier.The edge of a wing with two T fonts links together with bolt again; Or four angle steel line up cross, connect with bolt between the limb back of the body facing each other; Each bolt is with sleeve pipe (9), and sleeve pipe (9) length is identical with energy consumption inner core (2) thickness; Sleeve pipe (9) is positioned between the bolted two limbs back of the body; Transverse stiffener (7) all is set between two limbs of each angle steel along its length.

4. the anti-flexing of a kind of angle steel shape assembling type steel structure prestressing force according to claim 1 supports, and it is characterized in that: prestressed cable (4) two ends be connected with inner energy consumption inner core (7) two lower connecting plates (6) continuous.Prestressed cable (4) applies prestressing force.

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