How to calculate the falling force of column

1. The load transferred from the floor is transferred to the beam
the load of the beam is transferred to the column
according to one-way slab or two-way slab, the dead load and live load are combined and distributed to the beam according to the coefficient.

2. Do you want to know the horizontal concentrated force on the column or the axial force on the column? If the axial force is natural, according to the sum of the constant live load transmitted by the beam and slab that the column bears, that is, all the loads within the loading area of the column, including all floors from top to bottom, the live load can be reced according to the number of floors, referring to the load specification.

3. The axial force at the bottom of the column is the axial force at the top of the column plus the self weight of the column itself, which is only considered when calculating the vertical dead load. When calculating the live load, the axial force at the top and bottom of the column take the same value.

4. You must give the type of material and strength grade of the column, so that I can help you judge. If it is a concrete column, simply according to the axial compression member calculation, the steps are roughly as follows: the axial force of each column is 2000 × one thousand × 10 / 27 = 740N, l0 / b = 4.75 / 0.5 = 9.5, look up the table stability coefficient φ= 98, according to the formula: n ≤ 0.9 φ( fcA+f' yA' s)=0.9 × zero point nine eight × fcA+f' yA' s) According to what you said, the process can only be written here. You must know the number and size of steel bars and the strength grade of concrete. Of course, if I design it, C30 concrete is used, FC = 19.1n/mm

5. The vertical force acts on the column directly, and its axial force is the vertical pressure. The bearing capacity (i.e. normal pressure) and the pressure stability calculation of the column should be calculated. All must meet the design requirements.

6. Bearing capacity is divided into vertical bearing capacity and horizontal bearing capacity. The vertical bearing capacity should first collect the load on the slab, then distribute it to the beam, and then distribute the load on the beam to the column. The load includes static load and dynamic load, which should be checked according to the corresponding load specification, and the dead weight of beam, slab and column should also be included. The horizontal load requires the stiffness of the structure, and the horizontal loads such as seismic load and wind load are distributed according to the stiffness. This is a more complicated problem. It's not detailed enough. I hope it can help you in a macro way

7.

The bearing capacity of reinforced concrete is mainly borne by the concrete, that is to say, the concrete grade determines the bearing capacity of the column. Therefore, when the concrete grade is C20, it means that the concrete standard test block 150 * 150 * 150 is 20n / mm2 ring the pressure test. If it is converted into square meter, it is 20000 kn / m2

By analogy, C25 concrete is 25000kN / m2, C35 is 35000kN / m2. Where 1kg = 10N. C20 concrete can bear 2000 tons per square meter. Of course, it needs to be slightly lower than this number. After all, the algorithm is somewhat expanded

what grade of concrete can be configured can make the column bear much weight

According to the apparent density, concrete can be divided into heavy concrete, ordinary concrete and light concrete. The difference between these three kinds of concrete is the difference of aggregate

heavy concrete is made of aggregate with apparent density greater than 2500 kg / m3, which is especially dense and heavy. For example, Barite Concrete and steel chip concrete have the properties of X-ray impermeability and high temperature resistance γ The properties of X-ray; It is usually made of barite and iron ore

ordinary concrete is the concrete commonly used in construction, with apparent density of 1950-2500kg / m3, mainly made of sand and stone as the main aggregate, which is the most commonly used concrete in civil engineering

lightweight concrete is the concrete with apparent density less than 1950 kg / m3. It can be divided into three categories:

1. The apparent density of lightweight aggregate concrete is 800-1950 kg / m3. Lightweight aggregate includes pumice, volcanic slag, ceramsite, expanded perlite, expanded slag, slag, etc

2. concrete (foam concrete and aerated concrete) is 300~1000 kg / cubic meter. Foam concrete is made of cement slurry or cement mortar and stable foam. Aerated concrete is made of cement, water and air generating agent

There is no fine aggregate in the composition of macroporous concrete (ordinary macroporous concrete, lightweight aggregate macroporous concrete). The apparent density of ordinary macroporous concrete ranges from 1500 kg / m3 to 1900 kg / m3. It is prepared with crushed stone, soft stone and heavy ore slag as aggregates. The apparent density of lightweight aggregate macroporous concrete is 500-1500 kg / m3, which is made up of ceramsite, pumice, broken brick and slag

The selection of cement grade should adapt to the design strength grade of concrete. In principle, high strength concrete should be prepared and high grade cement should be selected; The concrete with low strength grade shall be prepared with low grade cement

If high-grade cement must be used to prepare low-strength concrete, the amount of cement will be less and the workability and compactness will be affected, so a certain amount of mixed materials should be added. If it is necessary to use low-grade cement to prepare high-strength concrete, the amount of cement will be too much and uneconomical, and other technical properties of concrete will be affected

High strength concrete: at present, the average strength of concrete used in western developed countries has exceeded 30MPa. In China, high strength concrete refers to concrete with strength grade of C60 or above.

2. Light weight concrete

light weight aggregate concrete: light weight concrete composed of light coarse aggregate, light fine aggregate (or ordinary sand), cement and water, The application of lightweight aggregate concrete is referred to as P92 5-16.

porous concrete. It is a kind of concrete with evenly distributed small pores and no aggregate. It is divided into two kinds: aerated concrete and foam concrete. Aerated concrete is generally used for roofing materials and wall materials. Foamed concrete is mainly used for roofing insulation material.

large hole concrete: coarse aggregate with similar particle size. It is mainly suitable for wall materials.

3. Impermeable concrete

impermeable concrete refers to the concrete whose impermeability grade is equal to or greater than p6.

4. Polymer concrete:

polymer concrete is made of organic polymer, Polymer concrete embodies the advantages of organic polymer and inorganic cementitious materials, Polymer concrete can be divided into three types: polymer cement concrete, polymer impregnated concrete and polymer cemented concrete

6. Pumping concrete:

pumping concrete refers to the concrete whose slump is not less than 100 mm and is pumped for construction. In addition to the strength required by the project, pumping concrete also needs to meet the requirements of fluidity, non segregation and less bleeding, The pozzolanic cement is not suitable for slag cement and fly ash cement.

7. Mass concrete

the minimum size of concrete structure is equal to or greater than 1m, or the concrete is expected to cause cracks e to the excessive temperature difference between the inside and outside of the concrete caused by the heat of cement hydration.

8, The purpose of adding fiber is to improve the tensile strength of concrete and rece its brittleness. The commonly used fiber materials are: glass fiber, mineral wool, steel fiber, carbon fiber and various organic fibers. At present, fiber concrete has been graally used in aircraft runway, bridge deck, light structure with thin end face and pressure pipeline

8. The columns in the pavement should be included in the pavement area. If the fire hydrant is installed by itself, it should also be included in the pavement area< The "commercial housing sales area calculation and public building area allocation rules" issued by the Ministry of construction and design clearly stipulates that:
Article 6: commercial housing sales area = built-in building area (including built-in use area + built-in wall area + balcony building area) + shared public area
built-in wall area:
(1) dimension around the use space of each set (unit) of commercial housing (2) the partition walls between commercial housing units, the partition walls between commercial housing units and public building space, and the external walls (including Gables) are all public walls, According to half of the horizontal projection area, the wall area inside the building is recorded
Article 8 the public building area consists of the following:
1. The building area of elevator shaft, staircase, garbage passage, substation room, equipment room, public hall and aisle, basement, ty room and other functions that are shared by the whole building and managed,
2 The basement and car shed that have been sold or rented as independent use space are not included in the public area

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10. The column is subjected to bending moment in two directions of the beam, and part of the load of the beam is transferred to the column to form the axial force of the column. The eccentricity should be judged according to the relative magnitude of bending moment and axial force according to the formula.