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According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively:
- a)0.4 and 4
- b)0.5 and 8
- c)0.8 and 6
- d)1 and 10
Correct answer is option 'C'. Can you explain this answer?
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According to IS 456 : 2000, the minimum and maximum percentage of long...
Longitudinal Reinforcement:
(i) CI. 26.5.3 of IS 456:2000, specifies that the total area of longitudinal bars in a column section must NOT be less than 0.8% of the gross column area. This limit on minimum reinforcement is imposed because of the following reasons:
(i) CI. 26.5.3 of IS 456:2000, specifies that the total area of longitudinal bars in a column section must NOT be less than 0.8% of the gross column area. This limit on minimum reinforcement is imposed because of the following reasons:
- In order to ensure that a minimum flexural resistance of the column exists due to unexpected eccentricities in the column loading.
- In compression members, creep under sustained loading is very predominant, especially at low percentages of steel. Thus, the resulting creep stress (due to creep strain) tries to yield the bars.
(ii) Maximum Reinforcement: The maximum area of cross-section of longitudinal bars must NOT exceed 6% of gross column area. However, in practice, a maximum of 4% is recommended.
Additional Information
Diameter and Number of bar:
(i) The diameter of longitudinal bars in column NOT be less than 12 mm. These bars must NOT be spaced more than 300 mm apart on the column perimeter.
(ii) For rectangular columns. a minimum of 4 bars is provided.
(iii) For Circular columns, a minimum of 6 bars be provided.
Cover = 40 mm or bar diameter
Additional Information
Diameter and Number of bar:
(i) The diameter of longitudinal bars in column NOT be less than 12 mm. These bars must NOT be spaced more than 300 mm apart on the column perimeter.
(ii) For rectangular columns. a minimum of 4 bars is provided.
(iii) For Circular columns, a minimum of 6 bars be provided.
Cover = 40 mm or bar diameter
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According to IS 456 : 2000, the minimum and maximum percentage of long...
The correct answer is option 'C' - 0.8 and 6.
Minimum and Maximum Percentage of Longitudinal Reinforcement in a Column:
According to IS 456:2000, the Indian Standard code of practice for plain and reinforced concrete, the minimum and maximum percentage of longitudinal reinforcement in a column, expressed as a percentage of the gross cross-sectional area of the column, are as follows:
Minimum Percentage of Longitudinal Reinforcement:
The minimum percentage of longitudinal reinforcement in a column is 0.8% of the gross cross-sectional area. This means that the amount of reinforcement should not be less than 0.8% of the total area of the column.
Maximum Percentage of Longitudinal Reinforcement:
The maximum percentage of longitudinal reinforcement in a column is 6% of the gross cross-sectional area. This means that the amount of reinforcement should not exceed 6% of the total area of the column.
Significance of Longitudinal Reinforcement in Columns:
Longitudinal reinforcement in columns is provided to enhance their load-carrying capacity and to control the crack width. Reinforcement helps in resisting the tensile forces generated due to bending and axial loads. It also helps in controlling the flexural and shear stresses.
Reasoning behind the Minimum and Maximum Percentages:
The minimum percentage of reinforcement is specified to ensure that the column has adequate strength to resist the applied loads and to prevent excessive deflection. It helps in avoiding the premature failure of the column due to inadequate reinforcement.
On the other hand, the maximum percentage of reinforcement is specified to limit the congestion of reinforcement and to ensure proper compaction of concrete. Excessive reinforcement can lead to difficulties in placing and compaction of concrete, which can result in poor quality and durability of the structure.
Importance of Following Code Provisions:
It is crucial to adhere to the code provisions specified in IS 456:2000 to ensure the structural integrity and safety of the columns. The code provisions are based on extensive research and experience and aim to provide guidelines for the design and construction of reinforced concrete structures.
By following the minimum and maximum percentages of longitudinal reinforcement in columns, engineers can ensure the structural stability, durability, and overall performance of the columns under different loading conditions. It is important to note that these percentages may vary depending on the specific design requirements and conditions of the structure, and it is always recommended to consult the relevant design codes and standards for accurate and safe design.
Minimum and Maximum Percentage of Longitudinal Reinforcement in a Column:
According to IS 456:2000, the Indian Standard code of practice for plain and reinforced concrete, the minimum and maximum percentage of longitudinal reinforcement in a column, expressed as a percentage of the gross cross-sectional area of the column, are as follows:
Minimum Percentage of Longitudinal Reinforcement:
The minimum percentage of longitudinal reinforcement in a column is 0.8% of the gross cross-sectional area. This means that the amount of reinforcement should not be less than 0.8% of the total area of the column.
Maximum Percentage of Longitudinal Reinforcement:
The maximum percentage of longitudinal reinforcement in a column is 6% of the gross cross-sectional area. This means that the amount of reinforcement should not exceed 6% of the total area of the column.
Significance of Longitudinal Reinforcement in Columns:
Longitudinal reinforcement in columns is provided to enhance their load-carrying capacity and to control the crack width. Reinforcement helps in resisting the tensile forces generated due to bending and axial loads. It also helps in controlling the flexural and shear stresses.
Reasoning behind the Minimum and Maximum Percentages:
The minimum percentage of reinforcement is specified to ensure that the column has adequate strength to resist the applied loads and to prevent excessive deflection. It helps in avoiding the premature failure of the column due to inadequate reinforcement.
On the other hand, the maximum percentage of reinforcement is specified to limit the congestion of reinforcement and to ensure proper compaction of concrete. Excessive reinforcement can lead to difficulties in placing and compaction of concrete, which can result in poor quality and durability of the structure.
Importance of Following Code Provisions:
It is crucial to adhere to the code provisions specified in IS 456:2000 to ensure the structural integrity and safety of the columns. The code provisions are based on extensive research and experience and aim to provide guidelines for the design and construction of reinforced concrete structures.
By following the minimum and maximum percentages of longitudinal reinforcement in columns, engineers can ensure the structural stability, durability, and overall performance of the columns under different loading conditions. It is important to note that these percentages may vary depending on the specific design requirements and conditions of the structure, and it is always recommended to consult the relevant design codes and standards for accurate and safe design.
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According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively:a)0.4 and 4b)0.5 and 8c)0.8 and 6d)1 and 10Correct answer is option 'C'. Can you explain this answer?
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According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively:a)0.4 and 4b)0.5 and 8c)0.8 and 6d)1 and 10Correct answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively:a)0.4 and 4b)0.5 and 8c)0.8 and 6d)1 and 10Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for According to IS 456 : 2000, the minimum and maximum percentage of longitudinal reinforcement in a column (expressed as percentage of gross cross-sectional area of the column), are respectively:a)0.4 and 4b)0.5 and 8c)0.8 and 6d)1 and 10Correct answer is option 'C'. Can you explain this answer?.
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