CN104100042A

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

Info

Publication number: CN104100042A
Application number: CN201410268960.6A
Authority: CN
Inventors: 徐亚丰; 朱绍杰; 吕丛丛; 翟章琳; 陈谦
Original assignee: Shenyang Jianzhu University
Current assignee: Shenyang Jianzhu University
Priority date: 2014-06-17
Filing date: 2014-06-17
Publication date: 2014-10-15

Abstract

The invention relates to a steel skeleton-steel pipe fiber concrete T-shaped section composite column, which is composed of steel skeletons, a steel pipe, steel bars and fiber concrete. The steel skeletons are on the limbs of the T-shaped column, and are in favor of improving the stress performance of the limbs of the T-shaped column; the steel pipe is located at the intersecting core part of the column limbs, thus effectively limiting the brittle deformation of high-strength concrete and promoting application of high-strength concrete in the T-shaped column; the fiber concrete is arranged inside and outside the steel pipe, and the characteristics of the fiber material are fully utilized to improve the low brittleness, tensile strength, shearing resistance, bending strength and other disadvantages of high-strength concrete; the steel bar skeletons have a restriction effect on the fiber concrete and strengthen the bearing capacity of the column. The steel skeleton-steel pipe fiber concrete L-shaped section composite column provided by the invention is a main component of the frame structure in high-rise and large span buildings, and has the characteristics of high bearing capacity, high stiffness, light weight, good plasticity and toughness, good impact and fatigue resistance, excellent seismic performance, and good durability, etc.

Description

Steel frame-steel pipe fibrous concrete T section coupled column

Technical field

The present invention relates to a kind of concrete component, particularly related to a kind of fiber for civil engineering mixed

Solidifying native T shape post is a kind of novel steel frame-steel pipe fibrous concrete T section coupled column.

Background technology

Current social, along with the lifting of expanding economy and resident living level, people are more and more higher to the requirement of house, especially building structure and room layout more and more paid attention to.Because the sectional dimension of ordinary concrete post is often greater than the thickness of body of wall, affect the use of the interior space, be difficult to meet the requirement that building is attractive in appearance.In order to address this problem, there is the form of structure of RC T shape post.The advantage of RC T shape rod structure system is more outstanding, and scholar both domestic and external, expert have carried out extensive, deep research to this.The theoretical system of L-shaped Reinforced Concrete Column basically forms, such as the provinces and cities such as Tianjin, Shenyang, Guangdong, Shanxi have completed writing of local code, and guides in engineering practice, and building area reaches tens million of square metres.

But along with the development of Super High and long span building structure, the shortcoming of pure RC T shape post is more and more outstanding.As be subject to the restriction of ratio of axial compressive force to axial compressive ultimate capacity of section, if still adopt reinforced concrete T shape post under larger load, will cause the sectional dimension of post very large; T shape post is due to the existence of many limbs, and its centre of shear does not often overlap with the cross section centre of form, and under stress, each limb produces warped normal strain and shear stress; Due to shear stress, make post limb concrete occur crack prior to ordinary rectangular post, produce abdomen shear crack, cause hetermorphiscal column fragility obvious, the deformability of hetermorphiscal column is reduced than ordinary rectangular post, anti-seismic performance is unsatisfactory.

Meanwhile, for many years, the research of people to steel fibre confined concrete crack developing, has obtained great progress.Having proposed steel fibrous concrete cracking strength is the conclusion (fiber distance theory) being determined by the steel fibre average headway that tensile stress is played to useful effect, thereby has started the practical development phase of this advanced composite material (ACM).In recent years, steel fibre is at home and abroad developed rapidly.It has overcome the shortcomings such as concrete tensile strength is low, limit elongation is little, property is crisp, has the performances such as good tension, bending resistance, shearing resistance, resistance are split, endurance, high tenacity, and oneself is used widely at engineering fields such as building, road and bridge, water conservancy projects.

Therefore, herein under above-mentioned background, plan is utilized the characteristic of fiber, mix in concrete, thereby improve the fragility of concrete material self, tension, the shortcomings such as shearing resistance and flexural strength are lower, and and reinforcing bar, the poor shortcoming of adhesive property between steel pipe, author is by analyzing the achievement in research in early stage, a kind of novel steel frame-steel pipe fibrous concrete T section coupled column has been proposed, this kind of coupled column combines RC T shape post, steel core concrete column, combined steel and concrete column, the advantage of fibrous concrete post, resource pressure and environmental pressure are alleviated, widen greatly the application and development space of concrete T-shaped post, there is very important Research Significance.

Summary of the invention

The object of this invention is to provide a kind of steel frame-steel pipe fibrous concrete T section coupled column, this Novel combined column has improved the stress performance of reinforced concrete T shape post, has improved the drawbacks such as fragility, tension, shearing resistance and the flexural strength of high-strength concrete be lower.The present invention is achieved through the following technical solutions: the T steel bone of steel frame-steel pipe fibrous concrete T section coupled column is formed by Plate Welding, be positioned on the limb of T shape post, steel pipe is positioned at Zhu center, when making, test specimen first reinforcing bar and steel pipe are connected and fixed by welding or bolt, then assembling reinforcement skeleton, formwork, builds fibrous concrete.The reinforcing bar being positioned on T shape post limb has improved stress performance and the deformation performance of limb portion; The steel pipe that is positioned at core place has improved supporting capacity and the ductility of T shape post; Take full advantage of the characteristic of fibrous material, improved the lower drawback of Brittleness of High Strength Concrete.

Advantage of the present invention and effect are:

1. make full use of the characteristic of fibrous material, improve the drawbacks such as fragility, tension, shearing resistance and the flexural strength of high-strength concrete be lower;

2. steel pipe is positioned at the inside of direction concrete crossover sites in length and breadth, is subject to outside concrete protection, has good fire-resistant, decay resistance;

3. steel pipe inner concrete, in three-phase pressured state, has improved the ultimate bearing capacity of pillar, for the application exhaust of high-strength concrete space;

4. reinforcing bar is positioned at the limb portion of T shape post, has improved the stress performance of limb portion;

5. can first construct reinforcing bar, steel pipe, be connected and fixed reinforcing bar, steel pipe at bottom welding or bolt, the then vertical muscle of colligation and stirrup poured into a mould fibrous concrete after forming skeleton, thereby formed superposed column;

6. improve the ductility of post due to the existence of reinforcing bar, steel pipe, improved the ultimate bearing capacity of post, be conducive to earthquake zone seismic design;

7. widen the application and development space of concrete T-shaped post, beautified architectural appearance.

Brief description of the drawings

Fig. 1 is the schematic diagram of steel frame-steel pipe fibrous concrete T section coupled column.

Be made up of reinforcing bar, steel pipe, fibrous concrete and cage of reinforcement, to be wherein positioned at steel pipe inside and outside for fibrous concrete, and reinforcing bar is positioned on the limb of T shape post, and steel pipe is positioned at T Xing Zhu center, and cage of reinforcement is in the surrounding of T shape post.In figure: 1 is longitudinal reinforcement, 2 is fibrous concrete, and 3 is steel pipe, and 4 is stirrup, and 5 is reinforcing bar.

Detailed description of the invention

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, interior parcel concrete, and 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.On the limb of T shape post, refer to the limit end of rectangle part, the T-shaped layout of reinforcing bar.The core of T shape post refers to the center in T shape post bight.Concrete technology is as follows:

1. according to the rules Plate Welding is become to reinforcing bar;

2. reinforcing bar and steel-pipe welding or bolt are connected and fixed, and keep vertical or certain angle;

3. assembling reinforcement skeleton;

4. in cage of reinforcement lateral branch template;

5. fiber and the cement etc. of certain proportion, certain size are fully stirred, form fibrous concrete;

6. cast fibrous concrete;

7. periodic maintenance;

8. arrive regulation maintenance day after date, form removal moulding.

Claims

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.