What should I do if the concrete structural column is not reinforced? What are the consequences

The structural column is a kind of seismic measure commonly used in the building after Tangshan ** in 1979, and the reinforcement in the structural column is not calculated according to the force, but according to the unified specifications and models of the structural requirements. Regulations are not consistent from place to place. There is no steel bar in the structural column from the perspective of daily use, the main role of the structural column is to resist the destructive force when it occurs, so that people can have a chance to escape, or can reduce the degree of damage to the building, and can be used for future maintenance.

However, from the perspective of construction, this is to cut corners, is irresponsible for the quality of the project, and will be built into a tofu slag project, which is absolutely not allowed.

As a result, the house does not pass the acceptance. The supervisor is fined. Party A was angry, and the consequences were serious.

For the bearing capacity, the lack of reinforcement has little impact on the bearing capacity of the column, and it is mainly borne by concrete. But if there is not a single steel bar in the column, the shear resistance is very poor. Neither can the ability to resist torsion.

When there is lateral force, the column is prone to damage.

If you don't let it go, the consequences will be serious.

Concrete is not strong and easy to break.

1. Concrete hemp surface.

Phenomenon: The surface of the concrete is rough and lacking in slurry, or there are many small pits, but there are no steel bars and gravel exposed.

Cause analysis: 1. The surface of the template is rough or not clean, and there are sundries such as dry and hard cement mortar, and the concrete surface is viscous when the mold is removed.

2. The release agent of the steel formwork is unevenly brushed, and the concrete surface is bonded to the formwork when the mold is removed.

3. The seam of the template is not tightly assembled, and the gap leaks slurry when pouring concrete.

4. The concrete vibration is not compact, the bubbles in the concrete are not discharged, and some of the bubbles stay on the surface of the template.

2. Honeycomb. Phenomenon: The concrete is locally loose, the mortar is less and the gravel is more, and there are gaps between the gravel, forming honeycomb-shaped holes.

Cause analysis: 1. The concrete mix ratio is unreasonable, the measurement of gravel and cement materials is wrong, or the amount of water added is inaccurate, resulting in less mortar and more gravel.

2. The concrete stirring time is short, there is no uniform mixing, the workability of the concrete is poor, and the vibration is not compact.

3. The concrete is not poured according to the operating procedures, and the blanking is improper, which concentrates the gravel and causes concrete segregation.

4. There is too much concrete cutting at one time, there is no segmentation and layered perfusion, the vibration is not real or the blanking and vibration are not well matched, and the vibration is not allowed to be divided and the material is cut.

5. The pores of the template are not blocked, or the stability of the template is insufficient, and the template is displaced when the concrete is vibrate, resulting in serious slurry leakage.

The concrete columns for steel structure are as follows:

Because the steel columns with concrete have better performance. First of all, concrete can prevent the pipe wall from losing local stability and prevent the inner surface of the steel column from corroding. Secondly, the steel column can prevent the lateral expansion and loose spalling of the concrete under the action of longitudinal pressure, so as to improve its compressive strength.

and resistance to deformation. Therefore, in the "Technical Regulations for Steel Structures of High-rise Civil Buildings" JGJ99-2015 Sinosteel.

Structural frame columns.

Including concrete-filled steel tubular columns.

Features of concrete:

Concrete has the characteristics of abundant raw materials, low cost and simple production process, so that the amount of concrete is getting larger and larger. At the same time, concrete also has the characteristics of high compressive strength, good durability and wide range of strength grades. These characteristics make it very widely used, not only in various civil engineering such as Li engineering.

Concrete is also an important material in shipbuilding, machinery industry, marine development, geothermal engineering, etc.

This is conducive to the structural connection between the two structures, and the cost of the steel-reinforced concrete structure is lower than that of the steel structure, and the fire resistance is higher than that of the steel structure.

The reinforced concrete column can exert the compressive strength of concrete, the cross-section is smaller than the reinforced concrete column, and the amount of steel is less than that of the steel column, which can reduce the cost accordingly. Reinforced concrete has a very good fire resistance and can avoid the use of expensive fire retardant coatings. The steel-framed concrete column is more convenient for the decoration of the project than the steel column.

In addition, the ductility is also better than that of reinforced concrete structures, and the stiffness is also greater than that of steel structures. The damping ratio of reinforced concrete and reinforced concrete is basically equal, but the ductility is improved to a certain extent, and the hysteresis curve is fuller. Since the cross-section of the reinforced concrete column is larger than that of the steel column, the stiffness is correspondingly larger.

Not only can the construction speed be faster than that of reinforced concrete structures.

The characteristic of the construction of steel reinforced concrete structure is that the steel skeleton structure can be formed first, and then the reinforced concrete part can be crossed. At this moment, can utilize steel frame structure as load-bearing structure for construction, save a large number of scaffolding, compared with reinforced concrete structure, can speed up construction, shorten construction period.

When not adopting the steel reinforced concrete beam, and adopt the steel beam and pour concrete as the floor slab on the profiled steel plate, its construction speed can even approach the level of steel structure construction speed. This is also one of the reasons why steel-reinforced concrete beams are not used in some steel structure projects.

Why do modern buildings use steel structures?

1. Light: The steel structure has the characteristics of light weight and excellent mechanical performance. Compared to concrete, wood, steel has the smallest ratio of density to strength, for example:

As far as roof trusses are concerned, the weight of steel roof trusses is only 30% or even 25% of that of the same concrete roof trusses under the same load strength conditions. The weight of the steel structure house is about 50 of the reinforced concrete house, but the usable area is about 4 higher than the reinforced concrete house.

2. Fast: The steel structure is processed and produced in the factory area, with the characteristics of batch production of large pieces and high precision of finished products, and the construction method of factory manufacturing and construction site high-strength bolt installation is adopted to effectively shorten the construction period and create conditions for reducing the cost and giving full play to the economic benefits of investment. Under the same conditions, compared with the construction period of reinforced concrete structure engineering, the steel structure is only 1 3 1 2 of the reinforced concrete structure.

3. Good: The steel structure has good material properties and high reliability. Steel is uniform, isotropic, has a large elastic modulus, has good plasticity and toughness, and is an ideal elastic plastic.

Therefore, the steel structure will not be suddenly fractured and damaged due to accidental overload or local overload, it can adapt to the vibration load, and the calculation model reflects the mechanical properties of Qichang steel well, so the analysis is accurate and reliable.

4. Provincial: Purely from the current material, the cost of steel structure is higher than that of concrete structure, but the speed of steel structure is about 50% faster than that of concrete structure, which will save a lot of time and cost; The overall weight of the steel structure is more than 50% lighter than that of the concrete structure of the house, and the cost of foundation treatment and transportation volume will be reduced.

Building a house is a systematic project, including design, manufacturing, transportation, installation, maintenance and management and many other links, therefore, on the whole, the steel structure is more "provincial".

Summary. Hello I'm glad to answer for you, the reinforced concrete load-bearing wall may crack without steel bars, because the load-bearing wall is not only compressed, but also under the horizontal load, such as ** load, wind load, there will be bending moment, at this time there will be tension, and the tensile strength of plain concrete is very low, only the compressive strength is weak, if there is a steel bar, the steel bar can withstand the tensile force, without the steel bar, the concrete will crack and deform after reaching the tensile strength. Therefore, the load-bearing wall must be equipped with steel bars, what will happen if the cement pillars of the building are not reinforced?

Will it fall? Hello I am glad to answer for you, the reinforced concrete load-bearing wall may crack without steel bars, because the load-bearing wall is not only compressed, but also under the horizontal load, such as ** load, wind load, there will be bending moments, at this time, there will be a situation of tension in the face of the cover, and the tensile strength of plain concrete is very low, only the compressive strength is weak, if there is a steel bar, the steel bar can withstand tensile force, without steel bar, the concrete will crack and deform after reaching the tensile strength of the wide. Therefore, the load-bearing wall must be equipped with reinforcement, ask for a custom message].

Structural columns are part of the connection with the ring beams, which together strengthen the stability of the building.

In multi-storey masonry houses, bottom frame and inner frame brick masonry, its function is generally: to strengthen the connection between the longitudinal walls, because the structural column is connected with its adjacent longitudinal and horizontal walls and tooth rubbing and is provided with 2 (6 tie bars every 500mm along the wall height, and each side of the steel bar extends into the wall more than 100mm. In general, during construction, the brick wall is built first and then the concrete column is poured, so that the combination of the transverse wall can be increased, and the shear bearing capacity of the masonry can be improved by 10% and 30%, although the proportion of the increase is not high, it can obviously restrain the cracking of the wall and limit the cracks.

The joint work of the structural columns and ring beams can divide and enclose the brick masonry, and when the masonry cracks, the cracks can be forced to be within the enclosed area without further expansion. Although the masonry has cracks, it can limit its misalignment, so that it can maintain the bearing capacity and can counteract the vibration energy and is not easy to collapse early. As a vertical load-bearing member, the masonry structure is most afraid of falling to the ground in all directions, so that the horizontal floor slab and roof fall, while the structural column can prevent or delay the collapse time to reduce losses.

The connection between the structural column and the ring beam can play a similar role as a frame structure, and its effect is very obvious.

Yes, but try not to knock it out, as it may affect the stability of the floor.

In the specified part of the wall of the masonry house, the concrete column made according to the structural reinforcement and the construction sequence of the concrete column after the concrete column is first built, is usually called the concrete structural column, referred to as the structural column.

Structural Column Building Requirements:

1.According to the requirements of seismic codes, structural columns are mainly arranged in seismic walls.

2, 120 (or 100) thick wall when the wall height is less than or equal to 3 meters, the width of the opening is less than or equal to, if not satisfied, the structural column or reinforced concrete horizontal tie beam should be added;

or 190) thick wall When the wall height is less than or equal to 4m, the width of the opening is less than or equal to, if it is not satisfied, the structural column or reinforced concrete horizontal tie beam should be added.

4. When there is no frame column at the corner of the wall and at the junction of the wall of different thicknesses, structural columns should be set.

5. When the wall length is more than 8m (or the wall length is more than 2 times the height of the storey), the structural column should be set in the middle of the wall length (at the edge of the hole when there is a hole).

6. Structural columns should be set on both sides of the larger openings and at the ends of the unconstrained walls, and the structural columns and the wall tie bars should be 2 6@500, and arranged along the full height of the wall.

That's no, it is the support point of the whole building, and there may be structural columns that have little impact on the building, but after they are knocked out, it will affect the stability and safety of the building.

Of course you can't knock it off. Causing damage to the building. Danger happens!

What happens if there are no steel bars in the concrete pillars of a building? Will it fall?

What happens if there is no steel bar in the cement column section of the formwork? Will it fall: It depends on what kind of pillar, the pillar with a diameter of 2 meters and a height of 2 meters will not fall, hehe (a bit extreme, but it can tell the problem).

The column has to bear both downward loads and side loads, and the concrete (that is, the cement column you are talking about) has good anti-combustion and slow compressive performance, but the tensile performance is very poor, and the load from the side will crush him.

Summary. Hello! We're glad to answer your questions!

Hello, the steel bar in the structural column is not in the center, it will not have an impact, oh, the steel bar should have been placed on four sides, zui is good symmetrical arrangement, 3cm away from the outer edge, that is, the protective layer is long enough. The column itself is a compressive member, and the steel bar can mainly be tensile energy, and the column in the column does not contribute much to the structure of the axial compression, and the eccentric column has a certain contribution.

Hello! We're glad to answer your questions! Hello, the steel bar in the structural column is not in the center, it will not have an impact, oh, the steel bar should have been placed on four sides, zui is good symmetrical arrangement, 3cm away from the outer edge, I believe that this is the protective layer for a long enough time.

The column itself is a compressive member, the steel bar can mainly slip and the old Xun Hantan is tensile resistance, and the column in the column does not contribute much to the structure of the axial compression, and the eccentric column has a certain contribution.

The reinforcement specification for structural columns requires that 4 12,250 mm of longitudinal reinforcement can be used for structural columns, and at the same time, the upper and lower positions of the columns should be appropriately increased; 2. At six or seven degrees, it is greater than 6 layers, at eight degrees it is greater than 5 layers, and at nine degrees, its longitudinal reinforcement should be 4 14,200 mm; 3. You can not design the foundation independently, but you need to carry the stove into the bottom of the house 500 mm. This kind of column can not be demolished, it is a key component in the overall brick-concrete structure, it can make the seismic capacity of the building strengthened, and should be designed according to the code standard in the connection between the column and the ring beam, so it can improve the stability of the overall building. Although it cannot bear erect loads, it can resist shear or seismic lateral loads, so such a structure cannot be dismantled and modified.

If it is demolished, it will implicate the entire building, causing the reinforced concrete structure to be affected accordingly. It is a good measure to improve the overall xing and stability of the building, and to avoid the collapse of the building. In life, if you encounter an owner who casually dismantles and alters the structural column, this is an illegal decoration, because this will cause the structure of the house to be badly affected and cause serious dangerous events.

The property in the community can completely prevent it, such as issuing a notice of suspension of illegal renovation and construction, informing the owner or renovation personnel to restore the original state in a very short time.