CN113605603A

CN113605603A - Construction scheme suitable for steel core reinforced concrete column, pure steel column and steel pipe column

Info

Publication number: CN113605603A
Application number: CN202110971176.1A
Authority: CN
Inventors: 刘长寿
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-08-23
Filing date: 2021-08-23
Publication date: 2021-11-05

Abstract

The invention relates to a construction scheme suitable for steel core reinforced concrete columns, pure steel columns and steel pipe columns. Mechanics reveals that the column should distinguish frame column and 'frame shear column', the frame shear column is weaker than bending resistance and stronger than compression resistance, the column only needs to be supported and self-protected during heavy shock, the axial compression ratio is greatly improved, the ductility is increased, and the contradiction of the aspect ratio is alleviated. The special steel for the central reinforcement cannot be used, so that the new idea of central reinforcement is not developed after being placed for more than 20 years. The scheme actively strikes to provide the requirements of the steel core column material for a supplier, and designs a construction scheme, mainly solving the problem of the continuity of the upper and lower components A and the ideal combination of the steel core B, the pure steel column, the steel pipe column and the reinforced concrete floor. Steel core (fig. 1) composition: the solid steel shaft (10) and the steel sleeve (12). The steel sleeve is firmly welded with the upper section and the lower section of the steel shaft through slotted welding seams (3 and 4); the steel sleeve is provided with a bracket (8) which supports the floor reinforced concrete beam; the sleeve and the steel shaft are provided with through holes (14) for inserting negative steel bars in the beam. The thickness of the steel core wrapped by the reinforced concrete is not less than 200, and the steel core is cast and tamped for construction and is fireproof.

Description

Construction scheme suitable for steel core reinforced concrete column, pure steel column and steel pipe column

Technical Field

House construction

Background

1. The existing building earthquake-resistant design specification stipulates that the axial pressure ratio of the pillars is 0.65, and is not more than 1.05. The column of the high-rise and super high-rise building is very thick, and the 2-meter square reinforced concrete column is very common and very intolerable. The thickness of the traditional reinforced concrete column completely depends on the compressive strength of concrete, and steel is not used.

2. Researchers in the last 90 th century put forward a new idea of central reinforcement of high-rise building steel concrete columns (year 1997 in 12 months)

Engineering earthquake-proof stage 4), a new idea of combining the central reinforcement and the peripheral reinforcement of the high-pressure earthquake-proof reinforced concrete column is provided, so that the central reinforcement, the peripheral reinforcement and the stirrups of the column are respectively stressed against pressure, bending and shearing. In a structural system of an earthquake-resistant wall or other structures bearing main lateral force, the ductility of the column is improved by adding the central reinforcing bar, and the axial compression ratio is improved, so that the contradiction of the height-width ratio of the column is alleviated, and the method has positive significance for the duration of the earthquake.

A courtyard has been practiced to centrally deploy steel pipe columns.

3. In the sakazaku earthquake, some steel structural columns which are seen to be very strong are sheared or broken, because the bending resistance is exerted to the utmost extent, and the shear stress and the tensile stress are increased to be unbearable. in Japan takes decades, the cost of wealth and fresh blood comes at the expense of passing through the road of the steel reinforced concrete from the hollow section steel, the hollow section steel and the solid section steel to the solid section steel … …, steel is gradually found to be required to be close to the center, and the improvement is carried out continuously and slightly. In fact, the result of the track can be clarified by the most basic mechanical principle, namely that the free kingdom is the steel core reinforced concrete column.

The consideration of transition from static design to dynamic design, the concept design mentions important height, and the adjustment of thought is urgently needed in the design field, and the arrangement of steel in the section of the pillar has a positive and clear understanding.

4. The steel for the column supplied in the world at present is mainly distributed to a place far away from the center, so that the inertia moment is improved, and the bending resistance is improved. Neglecting the current world, in many high-rise and ultra-high-rise frame shear structures, the problem of high-pressure instability and slenderness ratio do not exist even if the column material is made into the solid steel material due to high pressure.

5. The special steel for central reinforcement can not be used, so that the new idea of central reinforcement is not developed. After more than 20 years, the scheme actively strikes, provides the requirements of steel core column materials for suppliers, designs a construction scheme and mainly solves the problems of continuation of an upper member and a lower member A and combination of a steel core, a pure steel column, a steel pipe column and a reinforced concrete floor.

The brick is thrown and the jade is introduced according to the scheme under the condition of the construction requirement and the history urgency.

Disclosure of Invention

A new method for shearing column in frame.

"frame shear column" refers to a column in a frame shear system, including the case where the primary task of resisting seismic and lateral forces is undertaken by various other structures. This is the case for the vast majority of large section columns.

Mechanics reveal that "frame shear columns" should be treated differently from frame columns, especially in axial compression ratio.

The frame shear column should be weaker than bending resistance and stronger than compression resistance, and the column only needs to be supported and self-protected during large earthquake.

The axial compression ratio is greatly improved, the ductility is increased, and the contradiction of the aspect ratio is alleviated.

The frame shear column is sleeved with the frame column, and the axial compression ratio of the frame column is regulated, so that the fat concrete column is subjected to abuse worldwide!

1. Steel core reinforced concrete column construction scheme

The reinforced concrete is wrapped with a steel core.

Steel core (fig. 1) composition: the solid steel shaft (10) and the steel sleeve (12).

Combined into an integral steel core: performing steel sticking treatment (11) on the joint parts of the upper section steel shaft and the lower section steel shaft; adding a steel sleeve, and firmly welding the steel sleeve with the upper section and the lower section of the steel shaft through slotted welding seams (3 and 4); and (5) welding the periphery of the joint of the steel sleeve (5) to combine the upper sleeve and the lower sleeve with the steel shaft into a whole.

The combination of the steel core and the reinforced concrete floor: the steel sleeve is provided with a bracket (8) which supports the floor reinforced concrete beam; the sleeve and the steel shaft are provided with through holes (14) for inserting negative steel bars in the beam.

The steel core is wrapped by the reinforced concrete to form the integral steel core reinforced concrete column. The thickness of the reinforced concrete of the outer package is not less than 200, and the reinforced concrete is cast and tamped for construction and is fireproof.

The technical points are as follows: the steel core A is continued up and down, and the steel core B is ideally combined with the reinforced concrete beam plate column.

Is suitable for frame shearing columns.

The cross section can be square, rectangle, special polygon, etc., and the steel shaft size can be set to 300, 400, 500, 600, etc., which can be divided into more fine sections after practice.

Because the design side actively plays a role, the supply is required as required, and the shape of the section bar on the market is not always the right, so that the simplicity can be achieved, and the simplest design is the highest pursuit.

2. Pure steel column construction scheme

The by-product of the steel core reinforced concrete.

The pure steel column may adopt the steel core of fig. 1, but the outer surface of the steel sleeve does not need to engage teeth.

The technical points are as follows: the pure steel columns A are continued up and down, and the pure steel columns B are ideally combined with the reinforced concrete beam slab.

Is suitable for frame shearing columns.

In a proper occasion, when the polygonal section solid steel column does not have the slenderness ratio problem, the solid steel column can withstand stress examination, the key is fire resistance, the column is an important component, and the high-rise fire fighting time is uncertain in terms of Chinese practice, and further research needs to be carried out according to the development of materials, technologies and fire fighting.

3. Steel pipe column structure scheme

And (5) ladle concrete.

The steel core reinforced concrete column is a byproduct.

The steel core of fig. 1 can be sleeved on the steel pipe column, but the steel shaft is changed into an inner steel pipe; the outer surface of the steel sleeve does not require biting teeth.

The technical points are as follows: the steel pipe column A is continued up and down, and the steel pipe column B is ideally combined with the reinforced concrete beam slab.

Drawings

FIG. 1 Steel core (solid steel shaft and steel sleeve)

FIG. 2 schematic view of the insertion holes for the negative bars in the beam

The abstract attached drawing adopts the figure 1

Reference numerals:

a solid steel shaft (with beam inner negative reinforcement through hole)

B steel sleeve (with beam inner negative steel bar through hole, steel corbel and occlusion teeth)

1 floor level of floor system

2 floor beam

3 upper steel sleeve slot and the weld of the steel shaft of the layer

4 lower steel sleeve slot and weld joint of steel shaft of the layer

5 circumferential weld

6 300-500

7 1500±

8 steel corbel

9 welding groove

10 solid steel shaft

11 sticky Steel treatment

12 steel sleeve

13 occlusion tooth

14-beam inner negative steel bar through hole

Detailed Description

The interior negative reinforcement anchor of roof beam of side post, the combination of steel core and reinforced concrete foundation etc. this professional engineer's each row's design of difficult, the practice accumulation becomes the design.

Through experimental and quantitative analysis, operable design rules are formed, and various new problems from materials to construction and construction are solved.

The control of the steel core dosage, the control of the axial pressure ratio, the calculation method and the like are determined after intensive research and experiments. Then entering the standard text; and completing a design module, namely, still having a path of experiment and practice.

Even prestress can be adopted in the column, the steel core is used as a tension balancing body, so that the peripheral steel bars are pre-tensioned, the pressure of the steel core is fully exerted, and the pre-tensioning stress of the peripheral steel bars is beneficial to controlling the early yielding of the steel bars at the bending tension side in the heavy earthquake.

Besides the welding method, the combination of the sleeve and the steel shaft can also consider the methods of rivets, high-strength screws, opposite-penetrating bolts and the like, the practice is preferred, and the combination effect and the construction convenience are ensured. In addition to the sleeve engaging method, the combination of the steel core and the concrete can also be considered to insert the steel bar for holding (less the trouble of casting or machining the steel sleeve), and others.

The fire resistance of a pure steel column is a big problem, and refractory steel, coating, the refractory material for parcel in the aspect of the hardware can constantly develop, and in the aspect of the acquired, new condition, because the cross-section does not have the crotch, the post surface is regular, so conditional acquired fire control remedy, dedicated pure steel column watering system, the water yield is big, guarantees that under the condition of a fire, the post surface maintains the water curtain protection all the time.

When the steel core of the square column is 300, 400, 500 and 600 square by adding 200 thick reinforced concrete, the column can be completely made into a 1-meter square, and is not in an order of magnitude with a column with a square more than 2 meters.

Paying cost, doubling the original book, trying to reduce the original square column with the width of 2 meters to within 1 meter, adding 3 square meters of the used area in one layer and one column horizontally!

The column can be segmented by steel core reinforced concrete column and steel pipe column or even common reinforced concrete column, and the like.

Claims

1. A steel core reinforced concrete column structure scheme is characterized in that: steel core (fig. 1) composition: a solid steel shaft (10) and a steel sleeve (12); the joint part of the upper section and the lower section of the steel shaft is subjected to steel sticking treatment (11), a steel sleeve is added, the steel sleeve is firmly welded with the upper section and the lower section of the steel shaft through slotted welding seams (3 and 4), the joint part of the steel sleeve is welded (5) circumferentially, and the upper sleeve and the lower sleeve are combined with the steel shaft into a whole; the steel sleeve is provided with a bracket (8) which supports the floor reinforced concrete beam; the sleeve and the steel shaft are provided with through holes (14) for inserting negative steel bars in the beam; the thickness of the reinforced concrete wrapped outside the column is not less than 200, and the reinforced concrete is cast and tamped for construction and is fireproof; the technical points are as follows: the steel core A is continued up and down, and the steel core B is ideally combined with the reinforced concrete beam plate column; is suitable for frame shearing columns.

2. A structural scheme of a solid pure steel column is characterized in that: the pure steel column can adopt the steel core (figure 1), but the outer surface of the steel sleeve does not need to be meshed with teeth; the technical points are as follows: the pure steel columns A are continued up and down, and the pure steel columns B are ideally combined with the reinforced concrete beam plate; is suitable for frame shearing; the problem of fire resistance must be further studied.

3. A structural scheme of a steel pipe column is characterized in that: the steel core (figure 1) is sleeved on the steel pipe column, but the steel shaft is changed into an inner steel pipe; the outer surface of the steel sleeve does not need to be meshed with teeth; the technical points are as follows: the steel pipe column A is continued up and down, and the steel pipe column B is ideally combined with the reinforced concrete beam slab.