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Tests on beams with sustained loading

Hajnal-Konyi, K.

Six pairs of concrete beams, each containing one beam reinforced with mild steel and one with Tentor steel with span/depth ratios of 20, 30 and 40, and all designed for same bending moment, were kept under full design load for 4 3/4 yr; during this period deflections increased to 3.14-3.94 times original; all beams became unserviceable, although their factor of safety against failure was over 3; test results were compared with deflections calculated by various methods; tests proved that limiting slenderness ratios in CP 114(1957), Clause 309a, Table 13, are excessive if substantial proportion of design superimposed load is to be supported for long period; revision is suggested.

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Tests on beams with sustained loading

Hajnal-Konyi, K.

Six pairs of concrete beams, each containing one beam reinforced with mild steel and one with Tentor steel with span/depth ratios of 20, 30 and 40, and all designed for same bending moment, were kept under full design load for 4 3/4 yr; during this period deflections increased to 3.14-3.94 times original; all beams became unserviceable, although their factor of safety against failure was over 3; test results were compared with deflections calculated by various methods; tests proved that limiting slenderness ratios in CP 114(1957), Clause 309a, Table 13, are excessive if substantial proportion of design superimposed load is to be supported for long period; revision is suggested.

Tests on beams with sustained loading

Hajnal-Konyi, K.

Six pairs of concrete beams, each containing one beam reinforced with mild steel and one with Tentor steel with span/depth ratios of 20, 30 and 40, and all designed for same bending moment, were kept under full design load for 4 3/4 yr; during this period deflections increased to 3.14-3.94 times original; all beams became unserviceable, although their factor of safety against failure was over 3; test results were compared with deflections calculated by various methods; tests proved that limiting slenderness ratios in CP 114(1957), Clause 309a, Table 13, are excessive if substantial proportion of design superimposed load is to be supported for long period; revision is suggested.

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Title:

Tests on beams with sustained loading

Additional title:

Mag Concrete Research

Contributors:

Hajnal-Konyi, K. (author)

Published in:

Magazine of Concrete Research ; 15

Publication date:

1963

Size:

12 pages

Type of media:

Article (Journal)

Type of material:

Print

Language:

English

Keywords:

Beams and girders

© Metadata Copyright Elsevier B. V. All rights reserved.

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