Reinforced concrete columns work, what is needed?

Greetings, how are you steemit friends? Wish you good health always. After I look back at my post results for a few days ago, I finally realized that on the calculation of labor and material requirements I missed, the work of reinforced concrete columns.

Columns are designations for pillars that serve to pass a compressive force on a building; columns are structural elements that act as roof load supports and other building loads.

The compression force received by the column will be continued up to the foundation and neutralized with strong ground compressiveness.

If on the principle of distribution of the load column can not accept the load, then the column will be damaged and cause the building defect until it can not be used.

The building engineer will analyze and design the dimensions and elements of the column according to the need, in this design process the engineers are required for the design results are not wasteful and resistant to the pressure that arises.

According to Wang and Ferguson the columns are divided into three types:

1. Column Tie
2. Spiral Column
3. Composite Column

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^{Reinforced concrete columns. Photo I ( @kharrazi ) took a few months ago on a construction project using a pocket camera}

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In a simple building the column is divided into two types.

• Main Columns
  The main column is the column that sustains the main load as its task, the main column function is to support the load of the roof, walls and floors (on the building more 1 floor).
• Practical columns
  Practical columns serve as auxiliary to the main column in supporting the load and as a wall binder, the function of the practical column is to strengthen the wall encounter, binding the wall so as not to collapse at a certain distance.

At the beginning of human civilization, columns have not been fully used because humans still live caves that are created from nature or are deliberately created.

When humans leave the cave and start building simple houses of wood, columns or pillars are used, humans use wood as columns and others make trees as columns of their houses, such as houses built on trees.

Because extra maintenance is required and given limited timber resources in certain areas then the builders of these periods began to use rocks as columns, the stones are stacked and some are carved.

The use of stones as columns eventually become boomerang, because in some earthquake disaster the column is only able to accept the load from above and unable to accept the shock load caused by the earthquake.

As a result many of the magnificent buildings built at that time were destroyed and resulted in casualties.

After a period of industrial revolution the material of the columns has finally changed, heavy steel has finally become an attractive option, because in addition to saving employment also save costs.

Heavy steel columns are the impact of manufacturing materials and many buildings in big cities use them.

Lack of heavy steel at that time was not resistant to heat so that the steel will melt, unimaginable if there is a fire in a building then the building will melt and there will be many fatalities.

Because of these shortcomings the engineers finally found a solution to combine steel / iron with concrete material as we know it now.

iron wrapped with concrete resulting in non-corrosion reinforcing steel is also heat resistant, and the nature of reinforcement that serves to receive many types of pressure, such as pressure from the top, side and others.

After a little explanation of the columns then we will make the calculation of labor requirements and materials needed on the work of the column, especially the reinforced concrete column.

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^{Column reinforcement. Photo I ( @kharrazi ) took a few months ago on a construction project using a pocket camera}

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QUESTION

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it is known 1 unit of main column with dimension length 0,30 m width 0,30 m and height 4,00 m using reinforcement 8 bar Ø12 and brace Ø8 with distance 0,15 m and use concrete type K-225, hence how many labor and materials needed?

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ANSWER

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To calculate labor requirement and material of reinforced concrete column work then I will calculate the required volume first, while the required volume is.

• Concrete Volume K-225
• Weight Iron Reinforcement
• Area Formwork

After the calculation I will use the technical analysis in accordance with Indonesian Analysis Standard to determine the needs of labor and materials.

• Concrete K-225

Is known .

Information	Amount
Length	0.40 m
Wide	0.40 m
High	4.00 m
Unit	1 Unit

Completion

Information	Amount
Length x Width x Height = m3	0.40 x 0.40 x 4.00 = 0.64 m3
Volume x Unit	0.64 m3 x 1 Unit = 0.64 m3
Total Amount	0.64 m3

• Reinforcement

Main Reinforcement

Information	Amount
Length	4.10 m
Unit	8 Units
Total Length	4.10 x 8 = 32.80 m
The coefficient of iron Kg / m	0.00616225xØbesi ^ 2
Iron Diameter	Ø12
Kg / m	0.00616225xØ12 ^ 2 = 0.887Kg / m
Total Weight m x Kg / m	32.80 x 0.887 = 29.106 Kg (I)

Brace

Information	Amount
Length	((0.4-0.06) x4) +0.1 = 1.460 m
Amount	4.00 / 0.15 + 1 = 28.667 units
Total Length	1,460 x 28,667 = 41,853 m
The coefficient of iron Kg / m	0.00616225xØIron ^ 2
Iron Diameter	Ø8
Kg / m	0.00616225xØ8 ^ 2 = 0.394Kg / m
Total Weight m x Kg / m	41.853 x 0.394 = 22.306 Kg (II)
Total number (I + II)	29,106 + 22,306 = 40,411 kg

• Formwork

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^{Formwork of partially existing columns removed. Photo I ( @kharrazi ) took a few months ago on a construction project using a pocket camera}

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Formwork of columns should cover all sides and meetings to prevent the cement seeping out the formwork.
Is known .

Information	Amount
Side of formwork	4 Sides
Length	0.40 m
High	4.00 m
Use	1 time

Completion

Information	Amount
(Length x height) x side x usage	(4,00 x 0,40) x 4 x 1 = 6,400 m2
Total area of formwork	6,400 m2

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CALCULATION OF LABOR AND MATERIAL REQUIREMENTS

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^{Completed reinforced concrete columns. Photo I ( @kharrazi ) took a few months ago on a construction project using a pocket camera}

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• Concrete K-225

To complete 1m3 of concrete K-225 is required.

Information	Amount
Workers	1,650 Person per day
Stonemason	0.275 Person per day
Foreman	0.028 Person per day
Overseer	0.083 Person per day
Portland Cement	371,000 Kg
Concrete Sand	698,000 Kg
Pebbles Clean	1,047,000 Kg
Water	215 Liter

Once we know the coefficient for 1m3 K-225 concrete work then to finish 0.640 m3 K-225 concrete is required.

Items	Information	Amount
Workers	1,650 Person per day x 0.640 m3	1.056 Person
Stonemason	0.275 Person per day x 0.640 m3	0.176 Person
Foreman	0.028 Person per day x 0.640 m3	0.018 Person
Overseer	0.083 Person per day x 0.640 m3	0.053 Person
Portland Cement	371,000 Kg x 0.640 m3	237,440 Kg
Concrete Sand	698,000 Kg x 0.640 m3	446, 720 Kg
Pebbles Clean	1,047,000 Kg x 0.640 m3	670,080 Kg
Water	215 Liters x 0.640 m3	137,600 Liters

• Reinforcement

To complete 1Kg Requests are required.

Information	Amount
Workers	0.007 Person per day
Blacksmith	0.007 Person per day
Foreman	0.001 Person per day
Overseer	0.004 Person per day
Iron Reinforcement	1,050 Kg
Concrete Wire	0.015 Kg

Once we know the coefficients for 1kg of the job of finishing then to complete 40,411 Kg of Spawning is required.

Items	Information	Amount
Workers	0,007 Person per day x 40,411 Kg	0.283 Person
Blacksmith	0,007 Person per day x 40,411 Kg	0.283 Person
Foreman	0.001 Person per day x 40,411 Kg	0.028 Person
Overseer	0,004 Person per day x 40,411 Kg	0.162 Person
Iron Reinforcement	1,050 Kg x 40,411 Kg	42,432 Kg
Concrete Wire	0,015 Kg x 40,411 Kg	0.606 Kg

• Formwork

To complete 1m2 of column formwork work is required

Information	Amount
Workers	0.660 Person per day
Carpenter	0.330 Person per day
Foreman	0.033 Person per day
Overseer	0.033 Person per day
Wood class III	0.040 m3
Wooden nails (2 "-5")	0.400 Kg
Oil Formwork	0.200 Liter
Wood class II	0.015 m3
Multiplex 9 mm	0.350 Sheet
Dolken wood Ø8-10 cm, length 4,00 m	2,000 stems

Once we know the coefficient for 1m2 of the deflecting column work to complete 6,400 m2 of column formwork work is required.

Items	Information	Amount
Workers	0.660 Person per day x 6,400 m2	4,224 Person
Carpenter	0.330 Person per day x 6,400 m2	2,112 Person
Foreman	0.033 Person per day x 6,400 m2	0.211 Person
Overseer	0.033 Person per day x 6,400 m2	0.211 Person
Wood class III	0.040 m3 x 6,400 m2	0.256 m3
Wooden nails (2 "-5")	0.400 Kg x 6,400 m2	2,560 Kg
Oil Formwork	0.200 Liter x 6,400 m2	1,280 Liter
Wood class II	0.015 m3 x 6,400 m2	0.096 m3
Multiplex 9 mm	0.350 Sheets x 6,400 m2	2,240 Sheet
Dolken wood Ø8-10 cm, length 4,00 m	2,000 sticks x 6,400 m2	12,800 stems

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^{The finishing work of the reinforced concrete column has been completed. Photo I ( @kharrazi ) took a few months ago on a construction project using a pocket camera}

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CONCLUSION

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To complete the work of reinforced concrete columns with a length of 0.40 m, width of 0.40m, height of 4.00 m and using 8 Ø12 reinforcement bars as well as begel Ø8 with a distance of 0.15 m is required.

Items	Amount
Workers	5,563 Person
Stonemason / Blacksmith / Carpenter	2,571 Person
Foreman	0.257 Person
Overseer	0.426 Person
Portland Cement	237,440 Kg
Concrete Sand	446, 720 Kg
Pebbles Clean	670,080 Kg
Water	137,600 Liters
Iron Reinforcement	42,432 Kg
Concrete Wire	0.606 Kg
Wood class III	0.256 m3
Wooden nails (2 "-5")	2,560 Kg
Oil Formwork	1,280 Liter
Wood class II	0.096 m3
Multiplex 9 mm	2,240 Sheet
Dolken wood Ø8-10 cm, length 4,00 m	12,800 stems

This calculation is only an example and can be used by anyone, this calculation is in accordance with technical analysis of Indonesian National Standard and can be developed in accordance with the needs in the field.

With this calculation it is expected that young engineers can continue to develop knowledge until the realization of a better civilization.

This is all I can write on this occasion, for all the mistakes and lack of writing as a servant of God I apologize.

Thanks to friends who have visited this blog and provided constructive comments, as well as to the rest on scientists who are willing to sacrifice time to provide such knowledge today.

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source:

www.wikipedia.org-Column

www.wikipedia.org-Steel

www.wikipedia.org-Concrete

www.wikipedia.org-Reinforced concrete

www.wikipedia.org-Formwork

www.hdesignideas.com

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Best regards @kharrazi