CN204919987U - Prestressing force sways and exposes formula column base - Google Patents

Abstract

The utility model belongs to the field of steel structure engineering, and relates to a prestressed swing exposed column base, comprising a steel column (1) and a concrete foundation (2), the bottom of the steel column (1) is connected with the steel column bottom plate (3) fixed on the concrete foundation (2), the concrete foundation (2) is provided with prestressed unbonded steel strands (5), and the concrete foundation (2) is provided with the shear key (8) at the bottom of the column ) matching slots, a shear compression rubber layer (9) is provided between the shear key (8) and both sides of the slot, and one end of the prestressed unbonded steel strand (5) The anchorage (6) is anchored on the steel plate (7) pre-embedded in the concrete foundation (2), and the other end passes through the channel (10) reserved in the concrete foundation (2) and the steel column bottom plate (3) through the anchorage ( 6) Anchoring, the steel column bottom plate (3) and the top surface of the concrete foundation (2) are ground flat and tight. The column foot of the utility model can reduce the damage to the column foot caused by the earthquake, and can realize the swinging and lifting of the column foot under the condition of a large earthquake. At the same time, it also has a certain self-resetting function after the earthquake.

Description

Prestressed rocking exposed column feet

technical field

The utility model belongs to the field of steel structure engineering and relates to a novel steel structure column foot in building structures.

Background technique

Buckling-resistant bracing-frame system is currently a commonly used structural system in building structures. The biggest feature of this system is that various types of buckling-resistant bracing are added between the beam-column members of the frame. It can exhibit stable hysteresis performance under pressure. Due to the addition of anti-buckling supports in the frame, the overall lateral stiffness of the structural system has been considerably improved, which has a great effect on controlling the overall deformation of the structure. The same reasonable support design and arrangement have also changed the structural yield energy dissipation mechanism , to a certain extent protect the frame main components.

With the widespread use of buckling-resistant brace-frame systems, some disadvantages of the system have gradually been exposed. For taller buildings whose main modes change in the first order, under the action of wind load or earthquake, the structure will For a certain deformation, because the general layout of the supports is relatively symmetrical, the supports on one side are all in a state of tension, and the supports on the other side are all in a state of compression. After decomposing the structure as a whole, calculating the internal forces of the components separately and then combining them, it is found that for the frame columns on the support side, the continuous accumulation of the vertical axial force of the support decomposition through each floor will generate a large force in the frame columns on the first floor. Axial tension and axial compression. Since the concrete material is mainly used to withstand pressure, the huge axial tension will cause a great burden on the concrete foundation. Often the resultant value of the axial tension will be much greater than the self-weight of the frame column transmitted by the structure, so it is very likely to cause the concrete foundation Tensile fracture, causing fatal damage to the structure.

The exposed column foot of the prestressed swing frame is proposed for this phenomenon that occurs in the anti-buckling brace-frame. The arrangement of such column foot in the above structural system can relax the constraints between the structural members and the foundation, so that the structural members The contact surface with the foundation only bears pressure but not tension, and fully exerts the compressive performance of concrete to protect the main body of the structure. In recent years, relevant studies have shown that the swaying of structures can not only reduce the earthquake action and damage to the structure, but also reduce the cost of the structure, which is both economical and reasonable. After the earthquake, due to the effect of prestressed steel strands, the swayed structure also has a certain self-resetting function, which can effectively control the deformation of the structure and prevent excessive residual deformation.

Utility model content

The purpose of this utility model is to make certain improvements to the existing steel column feet, so that the column feet can have a swing function and a certain self-resetting function. The embodiment of this function needs to be under certain conditions. The foot maintains stable performance. When the structure undergoes large deformation during a major earthquake, the new type of column foot is different from the traditional column foot in that it will not be damaged, and it has a certain self-resetting function after the earthquake.

The utility model solves the problems of the technologies described above through the following technical solutions:

A prestressed swinging exposed column foot, including a steel column and a concrete foundation, the bottom of the steel column is connected with the bottom plate of the steel column and fixed on the concrete foundation, the prestressed unbonded steel strand is arranged in the concrete foundation, and the concrete foundation is equipped with The slotted hole matching the shear key at the bottom of the column, a shear compression rubber layer is arranged between the shear key and both sides of the slot hole, and one end of the prestressed unbonded steel strand is anchored in the concrete foundation by anchorage On the steel plate, the other end passes through the reserved hole of the concrete foundation and the bottom plate of the steel column is anchored by the anchor.

The steel plates mentioned above should be pre-embedded in the reinforcement cage of the concrete foundation. The steel plates can be welded and fixed with the reinforcement in the foundation reinforcement cage.

The concrete foundation should be provided with reserved channels for the prestressed unbonded steel strand and the channel for the shear key of the column base plate, and the position of the channel should be calibrated, and the other end of the prestressed unbonded steel strand should pass through the The reserved channel protrudes out of the reinforcement cage of the concrete foundation, and then the concrete foundation is poured.

The base plate of the column base should have holes through which the prestressed steel strands pass.

The shear key can be I-shaped or H-shaped steel, which is welded on the underside of the base plate of the column base and arranged symmetrically with the steel column as the center.

The shear compression type rubber layer should be prepared in advance, and then set on the shear key of the base plate of the column foot, and then insert the shear key into it according to the reserved shear key groove hole on the concrete foundation.

The anchors can be selected according to actual processing conditions and technical requirements, such as clip-type anchors, supporting anchors, etc.

After the utility model adopts the above scheme, its benefit lies in that the contact surface between the structural member and the concrete foundation only bears pressure but not tension, and fully exerts the compressive performance of concrete. When the structure encounters an earthquake equivalent to a small earthquake, the structural deformation is small, the axial tension generated in the column can be offset by the structure's own weight, and the column foot remains in a stable state. When the structure encounters an earthquake equivalent to a major earthquake, the overall structure undergoes a large deformation, and the superimposed axial tension generated in the column exceeds its own weight, and the column foot is slightly lifted and rotated, relying on the shear key and the rubber The rubber layer transmits and resists horizontal shear force. Due to the deformation ability of the rubber layer, the column foot can produce the same rotation effect as a hinged support, ensuring that the column foot will not be damaged. After the earthquake, under the action of prestressed tendons, the column foot can return to the initial state, showing a certain self-resetting effect, greatly reducing the residual deformation of the structure, and playing a role in controlling the deformation of the structure.

Description of drawings

Below in conjunction with the legend in the accompanying drawings the whole and part of the utility model is described in detail

Fig. 1 is a schematic diagram of the column foot structure of the utility model;

Fig. 2 is a schematic diagram of deformation of the column foot structure of the utility model;

In the figure 1-steel column; 2-concrete foundation; 3-column base plate; 4-stiffening rib; 5-prestressed steel strand; 6-anchor; 7-foundation embedded steel plate; 9-shear compression type rubber layer; 10-prestressed tendon channel; 11-concrete foundation reinforcement

Detailed ways

Below in conjunction with accompanying drawing, the utility model will be further described

As shown in Figure 1, a prestressed swing exposed column foot of the present invention includes a steel column (1) and a concrete foundation (2), and the concrete foundation (2) is provided with a prestressed unbonded steel strand ( 5), one end of the prestressed unbonded steel strand (5) is anchored on the pre-embedded steel plate (7) in the concrete foundation (2) through the anchorage (6), and the other end passes through the reserved The tunnel (10) and the steel column bottom plate (3) are anchored by the anchorage (6), and the concrete foundation (2) is provided with a slot matching the shear key (8) at the bottom of the column, and the shear key (8) and the slot A shear pressure type rubber layer (9) is arranged between the two sides of the hole.

The steel column (1) is welded to the base plate (3) of the column foot, and is strengthened by several stiffening ribs (4).

After the reinforcement cage in the concrete foundation (2) is bound and fixed, the positions of the prestressed tendon holes on the steel plate (7) are determined and checked, and then the steel plate (7) is opened.

The steel plate (7) is welded and fixed to the reinforcement in the foundation reinforcement cage, and the prestressed unbonded steel strand (5) is anchored and fixed by the anchor (6) and the steel plate (7).

The tunnel selection of the prestressed unbonded steel strand reserved in the concrete foundation (2) can be diversified, such as fixing a thin-walled steel pipe on the steel plate (7), and then passing the prestressed tendon through the tunnel, which can ensure that the pouring foundation ( 2) will not affect the prestressed tendons.

The shape of the shear compression type rubber cushion (9) should match the shape of the shear key (8), and its thickness should be determined according to the design requirements, then the rubber layer should be placed on the shear key (8), and then the shear key The key (8) is connected with the base plate of the column base by means of welding, bolts or the like.

Before pouring the concrete foundation (2), a shear key channel should be reserved at the position of the column foot shear key (8). After the foundation (2) is poured, insert the column foot into the concrete foundation (2), and finally place the Secondary grouting is carried out between the sole plate (3) and the concrete foundation (2) to form certain reinforcement measures.

After the position of the column foot is fixed and calibrated, pass the other end of the prestressed tendon (5) through the bottom plate of the column foot (3) and anchor it through the anchor (6) and apply prestress.

Claims (5)

1. prestressing force waves exposed suspension column, it is characterized in that: comprise steel column (1) and concrete foundation (2), described steel column (1) side is connected with floor of putting more energy into (4), steel column (1) and steel column base plate (3) are fixedly connected in concrete foundation (2), described concrete foundation is provided with prestressing force un-bonded prestressed steel strand in (2), one end of described prestressing force non-bending steel cable (5) is anchored at by ground tackle (6) on the steel plate (7) of pre-plugged in concrete foundation (2), the other end passes duct (10) reserved in concrete foundation (2) with steel column base plate (3) by ground tackle (6) anchoring, the slotted eye matched with shear key at the bottom of post (8) is provided with in described concrete foundation (2), the rubber layer (9) of pressure reducing type is provided with between described shear key (8) and slotted eye, described steel column (1) and concrete foundation (2) are by shear key slotted eye and steel strand (5) location and fix, described steel column base plate (3) and concrete foundation (2) end face polish and hold out against.

2. prestressing force as claimed in claim 1 waves exposed suspension column, it is characterized in that: the slotted eye being reserved with shear key (8) at the bottom of the duct (10) of prestress wire (5) and post in described concrete foundation (2).

3. prestressing force as claimed in claim 1 waves exposed suspension column, it is characterized in that: be embedded with the steel plate (7) carrying out anchor and position for steel strand (5) one end in described concrete foundation (2).

4. prestressing force as claimed in claim 1 waves exposed suspension column, it is characterized in that: one end of described prestressing force non-bending steel cable (5) is anchored on the steel plate (7) of pre-plugged in concrete foundation (2) by ground tackle (6), the other end through the reserved duct of concrete foundation (2) and steel column base plate (3) by ground tackle (6) anchoring.

5. prestressing force as claimed in claim 1 waves exposed suspension column, it is characterized in that: be provided with pressure reducing type rubber layer (9) between described shear key (8) and the reserved slotted eye of concrete foundation (2).