Case for the use of rectangular stress block in the revision of IS: 456 (2000)
By: Subramanian, N
.
Publisher: Thane ACC LTD 2021Edition: Vol.95(9), September.Description: 7-15p.Subject(s): Civil EngineeringOnline resources: Click here
In:
Indian Concrete Journal - ICJSummary: Most of the Indian concrete code [IS: 456 (2000)] provisions were developed during the 1970s and are based on experimental work on concrete having strength less than 40 MPa. The use of high-strength concrete (HSC), with strengths in the range of 60-130 MPa, has increased in recent years due to its superior performance and strength. High-strength concrete is used extensively in columns of multistory buildings, as it will reduce the size of columns and increase rentable space. The parabolicrectangular stress block specified in the IS: 456 (2000) was developed, however, on the basis of normal strength concrete column tests. Many international codes have specified Whitney’s equivalent rectangular stress block, which not only produces results comparable to that of the parabolic-rectangular stress block, but also has the advantage of reducing the computational effort. However, the applicability of the rectangular stress block to higher-strength concretes became questionable, especially for members under high levels of axial compression. Based on the experimental results on HSC columns, several modifications to the original rectangular stress block were proposed and different rectangular stress blocks are being specified in international codes, which can also tackle HSC. These different rectangular stress blocks are discussed and based on the comparison with several experimental data, a suitable one is recommended to be used in the future revision of IS: 456 (2000).
| Item type | Current location | Call number | Status | Date due | Barcode | Item holds |
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Articles Abstract Database
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School of Engineering & Technology (PG) Archieval Section | Not for loan | 2021-2022664 |
Most of the Indian concrete code [IS: 456 (2000)] provisions were developed during the 1970s and are based on experimental work on concrete having strength less than 40 MPa. The use of high-strength concrete (HSC), with strengths in the range of 60-130 MPa, has increased in recent years due to its superior performance and strength. High-strength concrete is used extensively in columns of multistory buildings, as it will reduce the size of columns and increase rentable space. The parabolicrectangular stress block specified in the IS: 456 (2000) was developed, however, on the basis of normal strength concrete column tests. Many international codes have specified Whitney’s equivalent rectangular stress block, which not only produces results comparable to that of the parabolic-rectangular stress block, but also has the advantage of reducing the computational effort. However, the applicability of the rectangular stress block to higher-strength concretes became questionable, especially for members under high levels of axial compression. Based on the experimental results on HSC columns, several modifications to the original rectangular stress block were proposed and different rectangular stress blocks are being specified in international codes, which can also tackle HSC. These different rectangular stress blocks are discussed and based on the comparison with several experimental data, a suitable one is recommended to be used in the future revision of IS: 456 (2000).
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