CN104100042A - Steel skeleton-steel pipe fiber concrete T-shaped section composite column - Google Patents

Abstract

The invention relates to a steel frame-steel tube fiber concrete T-shaped section composite column. The steel frame-steel tube fiber reinforced concrete T-shaped section composite column is composed of steel frame, steel tube, steel bar and fiber concrete. The steel frame is located on the limbs of the T-shaped column, which is conducive to improving the mechanical performance of the limbs of the T-shaped column; the steel pipe is located at the core part where the limbs of the column intersect, which effectively restrains the brittle deformation of high-strength concrete and promotes the high-strength concrete in the T-shaped column. The fiber concrete is located inside and outside the steel pipe, making full use of the characteristics of fiber materials, improving the brittleness of high-strength concrete, low tensile, shear and flexural strength and other disadvantages; the steel skeleton plays a restraining role on the fiber concrete, strengthening the bearing capacity of the column. The invention is the main component of the frame structure in high-rise and long-span buildings, which has high bearing capacity, high rigidity, light weight, good plasticity and toughness, good impact resistance and fatigue resistance, good earthquake resistance, and good durability, etc. features.

Description

Steel Reinforced Steel Tube Fiber Concrete T-section Composite Column

technical field

The present invention relates to a concrete member, in particular to a fiber-concrete used in civil engineering

Concrete T-shaped column is a new type of steel-steel fiber reinforced concrete T-shaped section composite column.

Background technique

In the current society, with the development of the economy and the improvement of residents' living standards, people have higher and higher requirements for housing, especially for housing structure and living room layout. Because the cross-sectional size of ordinary concrete columns is often larger than the thickness of the wall, it affects the use of indoor space, and it is difficult to meet the requirements of architectural beauty. In order to solve this problem, the structural form of reinforced concrete T-shaped columns appeared. The advantages of the reinforced concrete T-shaped column structure system are more prominent, and scholars and experts at home and abroad have conducted extensive and in-depth research on it. The theoretical system of reinforced concrete L-shaped columns has been basically formed. For example, Tianjin, Shenyang, Guangdong, Shanxi and other provinces and cities have completed the compilation of local regulations and guided them in engineering practice. The construction area reaches tens of millions of square meters. the

However, with the continuous development of super high-rise and long-span building structures, the disadvantages of pure reinforced concrete T-shaped columns have become more and more prominent. If limited by the axial compression ratio, if ordinary reinforced concrete T-shaped columns are still used under heavy loads, the section size of the columns will be very large; due to the existence of multiple limbs, the shear center and section centroid of T-shaped columns often In the state of stress, each limb produces warping normal stress and shear stress; due to the shear stress, the concrete of the column limbs cracks before the ordinary rectangular column, that is, abdominal shear cracks occur, resulting in obvious brittleness of the special-shaped column, making the special-shaped column The deformation capacity of the column is lower than that of ordinary rectangular columns, and the seismic performance is not ideal. the

Meanwhile, over the years, research on cracks in steel fiber-confined concrete has made significant progress. The conclusion that the cracking strength of steel fiber reinforced concrete is determined by the average spacing of steel fibers that have an effective effect on tensile stress (fiber spacing theory) was proposed, thus starting the practical development stage of this new type of composite material. In recent years, steel fiber has developed rapidly at home and abroad. It overcomes the shortcomings of concrete such as low tensile strength, low ultimate elongation, and brittleness. It has excellent tensile, bending, shearing, crack resistance, fatigue resistance, and high toughness properties. It has been used in construction, roads and bridges, and hydraulic engineering It has been widely used in engineering fields. the

Therefore, under the above-mentioned background, this paper intends to use the characteristics of fibers to be mixed into concrete, so as to improve the shortcomings of concrete materials such as brittleness, low tensile, shear and flexural strength, as well as the relationship between steel frames and steel pipes. Due to the shortcomings of poor bonding performance, the author proposed a new type of steel-reinforced steel tube fiber reinforced concrete T-shaped section composite column by analyzing the previous research results. This composite column combines reinforced concrete T-shaped columns, steel tube concrete columns, The advantages of bone concrete columns and fiber reinforced concrete columns reduce resource pressure and environmental burden, and greatly broaden the application and development space of concrete T-shaped columns, which has very important research significance. the

Contents of the invention

The purpose of the present invention is to provide a steel frame-steel fiber reinforced concrete T-shaped section composite column. This new type of composite column improves the mechanical performance of ordinary reinforced concrete T-shaped columns, and improves the brittleness, tensile resistance and shear resistance of high-strength concrete. And disadvantages such as low bending strength. The present invention is realized through the following technical solutions: the T-shaped steel frame of the steel frame-steel tube fiber reinforced concrete T-shaped cross-section composite column is welded by steel plates, located on the limbs of the T-shaped column, and the steel pipe is located at the center of the column. The steel frame and steel pipe are fixed by welding or bolting, then the steel frame is bound, the formwork is set up, and fiber concrete is poured. The steel frame on the T-shaped column improves the mechanical performance and deformation performance of the limb; the steel pipe at the core improves the bearing capacity and ductility of the T-shaped column; the characteristics of fiber materials are fully utilized to improve the brittleness of high-strength concrete Lower cons. the

Advantage and effect of the present invention are:

1. Make full use of the characteristics of fiber materials to improve the disadvantages of high-strength concrete such as brittleness, low tensile, shear and flexural strength;

2. The steel pipe is located inside the intersection of concrete in the vertical and horizontal directions, protected by the external concrete, and has good fire resistance and corrosion resistance;

3. The concrete in the steel pipe is in a three-phase compression state, which improves the ultimate bearing capacity of the column and provides space for the application of high-strength concrete;

4. The steel frame is located at the limb of the T-shaped column, which improves the mechanical performance of the limb;

5. The steel frame and steel pipe can be constructed first, and the steel frame and steel pipe can be welded or bolted at the bottom, and then the longitudinal bars and stirrups can be tied to form a skeleton and then pour fiber concrete to form a laminated column;

6. Due to the presence of steel frames and steel pipes, the ductility of the column is improved, and the ultimate bearing capacity of the column is increased, which is beneficial to the seismic design of the earthquake zone;

7. It widens the application and development space of concrete T-shaped columns, and beautifies the appearance of the building.

Description of drawings

Fig. 1 is a schematic diagram of a steel frame-steel tube fiber reinforced concrete T-shaped section composite column. the

It is composed of steel skeleton, steel pipe, fiber concrete and steel skeleton, wherein the fiber concrete is located inside and outside the steel pipe, the steel skeleton is located on the limb of the T-shaped column, the steel pipe is located in the center of the T-shaped column, and the steel skeleton is located around the T-shaped column. Among the figure: 1 is longitudinal reinforcement, 2 is fiber concrete, 3 is steel pipe, 4 is stirrup, 5 is steel frame. the

Detailed ways

Steel frame-steel fiber reinforced concrete T-section composite column: composed of steel frame, steel pipe, steel frame and fiber concrete, steel frame is welded by steel plate; The bones are on the limbs of the T-columns, the steel tubes are in the core of the T-columns, and the concrete is fiber-reinforced concrete. The upper limb of the T-shaped column refers to the side end of the rectangular part, and the steel frame is arranged in a T shape. The core of the T-pillar refers to the center of the corner of the T-pillar. The specific process is as follows:

1. Weld the steel plate into a steel frame according to the regulations;

2. Fix the steel frame and steel pipe by welding or bolting, and keep it vertical or at a certain angle;

3. Binding steel skeleton;

4. Support formwork on the outside of the steel skeleton;

5. Fully mix a certain proportion and a certain size of fiber with cement to form fiber concrete;

6. Pouring fiber concrete;

7. Regular maintenance;

8. After the specified maintenance date is reached, the mold is removed and formed.

Claims (3)

1. steel frame-steel pipe fibrous concrete T section coupled column: be made up of reinforcing bar, steel pipe, cage of reinforcement and fibrous concrete, reinforcing bar is formed by Plate Welding; In steel pipe, have concrete, stirrup is T-shaped, and interior parcel concrete, is characterized in that: reinforcing bar is positioned on the limb of T shape post, and steel pipe is positioned at the core of T shape post, and concrete adopts fibrous concrete.

2. according to the steel frame-steel pipe T section coupled column described in claim 1, it is characterized in that: on the limb of T shape post, refer to the limit end of rectangle part, the T-shaped layout of reinforcing bar.

3. according to the steel frame-steel pipe fibrous concrete T section coupled column described in claim 1, it is characterized in that: the core of T shape post refers to the center in T shape post bight.