CN105672570A - Multi-bundle-shaped ultra-high-performance concrete constraint common concrete T-shaped column and T-shaped short-leg shear wall - Google Patents

Abstract

The invention discloses an ordinary concrete T-shaped column constrained by multi-bundle ultra-high-performance concrete, which includes a T-shaped concrete special-shaped column, and the column skeleton of the T-shaped concrete special-shaped column includes an outer cladding plate wrapped outside the special-shaped column and a separate special-shaped column The inner partition of the cross-section interior space, the column skeleton is cast and formed by ultra-high performance concrete; the outer cladding board and the inner partition divide the section of the special-shaped column into multiple independent units, forming multiple bundles of independent split columns; T Corresponding orthogonal internal partitions are set at the intersection of the two column limbs of the special-shaped concrete column. Similarly, the invention also discloses a T-shaped short-leg shear wall. The invention makes full use of the self-constraint function of concrete, replaces the outsourcing constraint effect of steel on concrete, saves steel and reduces the cost; based on the excellent compactness, castability and high strength of UHPC, the multi-beam shape can significantly increase the shear force of special-shaped columns or short limbs The bearing capacity and durability of the wall structure have the characteristics of simple structure, novel materials and superior performance.

Description

Ordinary concrete T-shaped columns and T-shaped short-leg shear walls confined by multi-beam ultra-high performance concrete

technical field

The invention belongs to the technical field of construction engineering, and in particular relates to a multi-beam ultra-high-performance concrete restrained ordinary concrete T-shaped column and a T-shaped short-limb shear wall.

Background technique

Modern civilization has given birth to a change in people's aesthetic concept of things. As a vertical load-bearing member in the frame structure—column, its traditional form is a rectangular cross section. The special-shaped column structure has the characteristics of the same thickness as the infill wall, so it avoids the column flute protruding from the wall, increases the actual usable area of the room, and improves the "household rate", which is favored by owners and users. With the continuous development of commercial buildings such as residences and offices towards high-rise and super-high-rise buildings, the width of the column limbs of the special-shaped column structure is bound to increase, resulting in the contradiction between mechanical properties and building functions, which limits the special-shaped column structure. promotional use.

Short-limb shear walls usually refer to shear walls whose section height to thickness ratio is 5 to 8. As a transition form between special-shaped columns and general shear walls, they are widely used in high-rise residential buildings and large commercial buildings. The importance is self-evident. Similar to special-shaped columns, short-limb shear walls have a variety of cross-sectional forms. Currently, they are mainly arranged in the intersection of room partition walls in the form of L, T, ten, and Z-shaped cross-sections. With the growth of the urban population and the rapid development of the economy, the urban buildings are also constantly developing towards high-rise and super high-rise buildings. However, the shortage of land also needs to meet people's demand for "housing rate", which puts forward more requirements for the structure. Strict requirements, that is, to ensure the load-carrying capacity of the short-limb shear wall without greatly increasing the section width, if this problem is not handled properly, it will inevitably limit the popularization and use of the short-limb shear wall structure.

In order to meet the requirements of structural bearing capacity, many enhanced measures are used for special-shaped columns or short-leg shear wall structures. These measures mainly include improving concrete strength (such as using high-strength concrete), increasing steel content (such as using steel concrete) and Confined concrete (such as concrete filled steel pipe) etc. are used. Although high-strength concrete special-shaped columns or short-limb shear walls can improve the bearing capacity of columns or walls, the brittleness of high-strength concrete is very unfavorable to the seismic performance of structural columns or walls. Of course, the built-in section steel can make up for the deficiency of high-strength concrete in this respect, but another significant problem also follows, that is, arranging more section steel in the slender special-shaped column or short-shear wall It is very difficult to arrange the reinforcement in the beam-column joint area or the beam-wall joint area, which leads to a narrower space in the joint area, which is very unfavorable to the decrease of coarse aggregate during concrete pouring, and may easily cause voids, honeycombs, etc. in the joint core area Phenomenon. Obviously, the use of confined concrete technology can better avoid the occurrence of the above phenomenon. The CFST special-shaped column or short-leg shear wall inherits the advantages of the CFST structure, but it is not economical in terms of the amount of steel used, and what is even more important is that Concrete-filled steel tube special-shaped columns or short-leg shear walls are prone to 90-degree internal angles, which can lead to weak restraint of steel tubes on concrete and poor composite performance. Although corresponding structural measures (such as setting stiffeners and tie rods) have also been proposed to improve the performance of CFST special-shaped columns or short-leg shear walls, these measures will cause greater damage to steel pipes, and the processing cost is also high. increased badly. In addition, the outsourced steel pipes are also extremely cumbersome in the post-corrosion and fire prevention treatment of concrete filled steel tube special-shaped columns. If not handled properly, it will be very detrimental to the durability and fire performance of special-shaped columns or short-leg shear wall structures.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-beam ultra-high performance concrete restrained ordinary concrete T-shaped column and a T-shaped short-leg shear wall with simple structure, convenient construction, excellent performance, and economical savings.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: multi-bundle ultra-high performance concrete restrains ordinary concrete T-shaped columns, including T-shaped concrete special-shaped columns, and the column skeleton of T-shaped concrete special-shaped columns includes cladding outside the special-shaped columns The outer cladding plate and the inner partition that separate the internal space of the special-shaped column section, the column skeleton is cast and formed by ultra-high performance concrete, and the outer cladding plate and the inner clapboard that constitute the skeleton are interconnected; the outer cladding plate and the inner clapboard connect the special-shaped column section It is divided into multiple independent units to form multiple bundles of independent split columns; the intersection of the two column limbs of the T-shaped concrete special-shaped column is provided with a corresponding orthogonal inner partition.

The inner partition is perpendicular to the height direction of each column limb of the special-shaped column and parallel to the column width and thickness direction.

A steel cage frame is placed in each unit body, and ordinary concrete is used to pour and compact each unit body.

The steel cage skeleton is rectangular and is made of longitudinal steel bars and horizontal stirrups.

The T-shaped concrete special-shaped column is a side column in the special-shaped column frame structure.

Multi-bundle ultra-high performance concrete constrained ordinary concrete T-shaped short-leg shear wall, including T-shaped concrete short-leg shear wall, and the wall skeleton of T-shaped concrete short-leg shear wall includes cladding outside the short-leg shear wall The outer cladding plate and the inner clapboard separating the internal space of the short-limb shear wall section, the wall skeleton is formed by pouring ultra-high performance concrete, and the cladding plate and the inner clapboard constituting the skeleton are interconnected; the cladding plate and the inner clapboard will be The section of the short-limb shear wall is divided into multiple independent units to form a plurality of beam-shaped independent split walls; the intersection of the two wall limbs of the T-shaped concrete short-limb shear wall is provided with corresponding orthogonal internal partitions.

The inner partition is perpendicular to the height direction of each wall pier of the short-limb shear wall and parallel to the width direction of the wall pier.

A steel cage frame is placed in each unit body, and ordinary concrete is used to pour and compact each unit body.

The steel cage skeleton is rectangular and is made of longitudinal steel bars and horizontal stirrups.

Aiming at the deficiencies of the existing T-shaped concrete special-shaped columns, the inventor designed a multi-bundle ultra-high performance concrete confined ordinary concrete T-shaped column, including T-shaped concrete special-shaped columns, and the column skeleton of the T-shaped concrete special-shaped columns includes The outer cladding plate that covers the special-shaped column and the inner partition that separates the internal space of the special-shaped column section, the column skeleton is formed by pouring ultra-high performance concrete; the outer cladding plate and the inner clapboard divide the special-shaped column section into multiple independent units, A plurality of beam-shaped independent split columns are formed; corresponding orthogonal internal partitions are set at the intersection of the two column limbs of the T-shaped concrete special-shaped column. Similarly, the inventor also designed a multi-bundle ultra-high performance concrete restrained ordinary concrete T-shaped short-leg shear wall.

The present invention realizes the substantial improvement of the bearing capacity of the T-shaped column or wall through three aspects:

<1> Use high-density and high-strength ultra-high-performance concrete as the outer cladding and inner partitions of T-shaped columns or walls to form the restrained skeleton of ordinary concrete inside, and these two "high" just promote ultra-high performance Concrete can replace the confinement material of traditional steel pipes to concrete, overcome the defects of poor corrosion resistance and fire resistance of outsourcing steel pipes, and also help save steel and reduce project costs and post-maintenance costs;

<2> Ultra-high performance concrete follows the characteristics of concrete pourability, and uses it as an inner partition to divide the internal space of T-shaped columns or walls, forming multiple beam-shaped independent split columns or walls, smaller The column or wall section can play the role of tight constraint, which is conducive to a stronger constraint effect on concrete materials; and by setting the corresponding orthogonal inner partition at the intersection of two column or wall limbs, it can reduce the T-shape. The adverse effect of the 90-degree internal angle of the column or wall on the bearing capacity of the column or wall greatly improves the bearing capacity of the T-shaped concrete special-shaped column or the T-shaped short-leg shear wall;

<3> Various types of strengthening measures can be configured in each bundle of independent split columns or walls, such as steel cage skeleton, steel skeleton, steel pipe, PVC pipe and high-strength concrete, etc., to facilitate T-shaped columns or T-shaped columns that meet different bearing capacity requirements. wall design form.

In a word, the present invention makes full use of the self-constraint function of concrete (ultra-high performance concrete restrains ordinary concrete) to replace the outsourcing restraint effect of steel on concrete, saving steel and reducing cost; based on the excellent compactness and pourability of ultra-high performance concrete And high strength, multi-beam shape can significantly improve the bearing capacity and durability of special-shaped columns or short-leg shear wall structures, and has the characteristics of simple structure, novel materials, and superior performance. In addition, prefabricated ultra-high-performance concrete columns or wall skeletons can meet the requirements of building industrialization. At the same time, the light-weight and high-strength ultra-high-performance concrete is conducive to mechanized hoisting and can effectively speed up the construction progress.

Description of drawings

Fig. 1 is a schematic cross-sectional view of a column skeleton of a multi-bundle ultra-high performance concrete restrained ordinary concrete T-shaped column or a column or wall skeleton of a T-shaped short-limb shear wall in the present invention.

Fig. 2 is a schematic cross-sectional view of ordinary concrete T-shaped columns or T-shaped short-limb shear walls confined by multi-bundle ultra-high performance concrete.

Among Fig. 1 and Fig. 2: 1 interior clapboard one, 2 interior clapboard two, 3 interior clapboard three, 4 interior clapboard four, 5 outer cladding plate, 6 longitudinal steel bars, 7 horizontal hoops, 8 ordinary concrete.

detailed description

basic structure

As shown in Fig. 1 and Fig. 2, multi-bundle ultra-high performance concrete of the present invention restrains common concrete T-shaped column, comprises T-shaped concrete special-shaped column (side column in special-shaped column frame structure), the column of T-shaped concrete special-shaped column The body skeleton includes the outer cladding plate covering the special-shaped column and the inner partition that separates the internal space of the special-shaped column section. The plates are connected to each other; the inner partitions are arranged in each column limb perpendicular to the height direction of each column limb of the special-shaped column and parallel to the width direction of the column limb at a certain distance. The unit body forms a plurality of bundled independent split columns; the intersection area of the two column limbs of the T-shaped concrete special-shaped column is provided with a corresponding orthogonal inner partition. A moderately reinforced steel cage frame is placed in each unit body, and ordinary concrete is used to pour and compact each unit body.

Similar, as shown in Fig. 1 and Fig. 2, multi-bundle ultra-high performance concrete of the present invention confines ordinary concrete T-shaped short-leg shear walls, including T-shaped concrete short-leg shear walls, and T-shaped concrete short-leg shear walls The wall skeleton of the wall includes the outer cladding plate covering the short-limb shear wall and the inner partition separating the internal space of the short-limb shear wall section. The wall skeleton is a prefabricated component formed by ultra-high performance concrete pouring at one time And the outer cladding board and the inner partition that constitute the skeleton are connected to each other; the inner clapboard is arranged in each wall pier perpendicular to the height direction of each wall pier of the short-limb shear wall and parallel to the width direction of the wall pier according to a certain distance, and the outer cladding board and the inner clapboard The partition divides the section of the short-leg shear wall into multiple independent units, forming a plurality of beam-like independent split walls; the intersection area of the two wall limbs of the T-shaped concrete short-leg shear wall is set with a corresponding orthogonal interior clapboard. A moderately reinforced steel cage frame is placed in each unit body, and ordinary concrete is used to pour and compact each unit body.

design principle

As shown in Figure 1, in the column skeleton of the special-shaped column and the wall skeleton of the short-limb shear wall, the first internal partition, the second internal partition, and the third internal partition are arranged on the two orthogonal columns of the T-shaped section (wall ) limbs, and each internal partition and the outer cladding plate on the corresponding side are connected to each other, and the core area of the intersection is separated into a split column (wall), thereby eliminating the 90-degree shadow of the T-shaped column (wall) section. In addition, the first inner partition, the fourth inner partition, the second inner partition, and the third inner partition must be perpendicular to the height of the vertical column (wall) limb and the horizontal column (wall) limb respectively and parallel to The limb width of the corresponding column (wall) limb. The column body of the special-shaped column and the wall skeleton of the short-limb shear wall are arranged at a certain distance along the two orthogonal columns (walls) according to the requirements of the bearing capacity. If the load on the upper part of the structure is large, each The spacing of the internal partitions is reduced, and the number of internal partitions is increased accordingly; otherwise, the spacing is increased and the number is reduced; by setting the outer cladding board outside the T-shaped column (wall), the function of the external packaging to restrict the interior is formed, and the internal clapboard and the The outer cladding boards are interpenetrated to form an overall skeleton; the T-shaped skeleton is molded and ultra-high performance concrete is poured into it, and the T-shaped ultra-high performance concrete column (wall) body skeleton is formed after steam curing. The production process should be carried out in a higher-standard prefabricated component factory to ensure component quality. As shown in Figure 2, on the basis of the column (wall) body skeleton in Figure 1, the corresponding longitudinal steel bars and horizontal stirrups are arranged according to the needs, and the rectangular steel cage skeletons bound by the two are placed in each bundle. In the body column (wall), the bearing capacity of the T-shaped column (wall) is further enhanced; after that, ordinary concrete is poured into the inner space, thus forming multi-bundle ultra-high performance concrete restraint ordinary concrete T-shaped columns and T-shaped short legs shear wall.

production use

1) Firstly, the formwork of the prefabricated component factory is formed to form a T-shaped column column or a T-shaped wall wall skeleton as shown in Figure 1, and a rectangular split column or wall needs to be set at the intersection of the column limbs or wall limbs in two directions , divided by three orthogonal inner partitions, according to the design requirements, the inner partitions are arranged at a certain distance in each column or wall, and then ultra-high performance concrete is poured into the outer cladding and inner partitions and steam cured ;

2) Hoist the T-shaped ultra-high performance concrete column or wall skeleton to the position of the side column of the special-shaped column frame structure or a specific position in the short-leg shear wall structure, and use the embedded connector to connect the T-shaped column skeleton Or the T-shaped wall frame is connected to the foundation or the lower floor;

3) Binding the rectangular steel cage skeleton according to certain specifications, the steel cage skeleton is composed of longitudinal reinforcement distributed at the four corners of the rectangular section and horizontal stirrups with a certain spacing between the stirrups;

4) Put the reinforcement cage skeleton into the split columns or split walls of the T-shaped column body or the T-shaped wall body, and pour ordinary concrete into it.

In summary, the present invention uses ultra-high performance concrete to constrain the multi-beam T-section column or wall of ordinary concrete, which has the following advantages compared with the prior art:

1) After partitioning the T-shaped section, each beam-shaped unit can be equivalent to a split column or wall, and each beam-shaped split column or wall is connected together by ultra-high-performance concrete slabs that are outer-wrapped and inner-separated , that is, there are splits in the conjoined body, so that an independent and unified cross-sectional form is formed. Compared with the traditional outsourcing constrained concrete special-shaped column or short-leg shear wall, the separated T-shaped column or wall can effectively overcome the problem of weakened bearing capacity caused by the 90-degree internal angle;

2) In each bundle section, various measures can be adopted to improve the bearing capacity of T-shaped columns or walls. Only ordinary concrete or high-strength concrete is used in each split column or wall; if the reinforcement method of high-strength concrete is used, it can effectively overcome the brittle nature of high-strength concrete and achieve an optimal combination;

3) Ultra-high-performance concrete (UHPC) is a high-strength, high-modulus, and high-ductility ultra-high-performance fiber-reinforced cement composite material. UHPC also has a relatively high density, a high impermeability coefficient, and water is basically not easy to penetrate. Enter the ordinary concrete inside through UHPC. If UHPC is used to replace ordinary concrete structures, a smaller plate thickness can usually be used to reduce the self-weight of the structure, thereby reducing the project cost. Therefore, replacing the steel pipe with ultra-high performance concrete, on the one hand, the good compactness of ultra-high performance concrete is not inferior to that of steel, and its compressive strength is much greater than the strength of steel, so steel can be saved and cost reduced; on the other hand, it can avoid The manpower and material resources required for post-maintenance, such as the reduction of durability caused by steel corrosion and strict fire prevention measures, can achieve the goal of once and for all;

4) The T-shaped column or wall made of ultra-high-performance concrete can be used as a prefabricated component to realize industrial production in the factory, ensuring the pouring and maintenance quality of ultra-high-performance concrete, speeding up the construction progress, and helping to save overall costs ;

5) Ultra-high performance concrete has superior tensile strength, compressive strength and durability than ordinary concrete, which can significantly improve the bearing capacity and corrosion resistance of T-shaped columns or walls, and the use of such components in extreme environments can also Ensuring the exertion of its mechanical properties has a good application prospect for realizing the self-constraint function of concrete.

Claims (9)

1. the constraint of pencil ultra-high performance concrete more than kind normal concrete T-shaped post, comprise T-shaped concrete profiled pile, it is characterized in that: the cylinder skeleton of described T-shaped concrete profiled pile comprises the skin plating being coated on outside Special-Shaped Column and separates the internal partition of internal space, Special-Shaped Column cross section, cylinder skeleton is built shaping by ultra-high performance concrete, and forms the skin plating of skeleton and internal partition connects with each other; Special-Shaped Column cross section is divided into multiple independent cell cube by described skin plating and internal partition, forms the independent separated column of multiple pencil; Two post limb confluences of described T-shaped concrete profiled pile arrange corresponding orthogonal internal partition.

2. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped post, it is characterised in that: described internal partition is perpendicular to Special-Shaped Column each post limb height direction and is parallel to post limb width.

3. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped post, it is characterised in that place reinforcement cage skeleton in cell cube described in each, and adopt normal concrete to build closely knit by each cell cube.

4. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped post, it is characterised in that: described reinforcement cage skeleton is rectangle, becomes by longitudinal reinforcing bar and horizontal hoop colligation.

5. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped post, it is characterised in that: described T-shaped concrete profiled pile is the side column in Framed Structure with Special-Shaped Columns.

6. the constraint of pencil ultra-high performance concrete more than kind normal concrete T-shaped shear wall with short piers, comprise T-shaped concrete shear wall with short piers, it is characterized in that: the wall skeleton of described T-shaped concrete shear wall with short piers comprises the skin plating being coated on outside shear wall with short piers and separates the internal partition of internal space, shear wall with short piers cross section, wall skeleton is built shaping by ultra-high performance concrete, and forms the skin plating of skeleton and internal partition connects with each other; Shear wall with short piers cross section is divided into multiple independent cell cube by described skin plating and internal partition, forms the independent split wall of multiple pencil; Two wall limb confluences of described T-shaped concrete shear wall with short piers arrange corresponding orthogonal internal partition.

7. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped shear wall with short piers, it is characterised in that: described internal partition is perpendicular to shear wall with short piers each wall limb height direction and is parallel to wall limb width.

8. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped shear wall with short piers, it is characterised in that place reinforcement cage skeleton in cell cube described in each, and adopt normal concrete to build closely knit by each cell cube.

9. many pencils ultra-high performance concrete according to claim 1 constraint normal concrete T-shaped shear wall with short piers, it is characterised in that: described reinforcement cage skeleton is rectangle, becomes by longitudinal reinforcing bar and horizontal hoop colligation.