Long term tests of reinforced concrete beams loaded by temperature gradient or settlement of a support

Jukka Jokela

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The creep of concrete has a considerable influence on the relaxation of the restraint effects and restraint stresses; particularly if the temperature of the concrete is higher than normal. The risk of cracking, for example, caused by the settlement of supports, is also diminished owing to creep; particularly if the rate of restrained displacement (settlement of a support) is slower than the rate of creep. It is difficult to consider the effect of relaxation from a calculational point of view, because the time dependences of several factors cannot be reliably modelled.

In this research the relaxation of the restraint effects, due to both sudden and slow settlement of a support, was examined as a function of time; the relaxation of the restraint effect due to a thermal gradient was also investigated. In particular, was observed that the relaxation was fairly rapid in a heated beam. The relaxation of restraint effects caused by the settlement of supports was also considerable.
Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalNuclear Engineering and Design
Volume133
Issue number1
DOIs
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed

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reinforced concrete
Thermal gradients
temperature gradient
Reinforced concrete
temperature gradients
Creep
creep
Concretes
time dependence
effect
test
gradients
Temperature
temperature
rate

Cite this

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abstract = "The creep of concrete has a considerable influence on the relaxation of the restraint effects and restraint stresses; particularly if the temperature of the concrete is higher than normal. The risk of cracking, for example, caused by the settlement of supports, is also diminished owing to creep; particularly if the rate of restrained displacement (settlement of a support) is slower than the rate of creep. It is difficult to consider the effect of relaxation from a calculational point of view, because the time dependences of several factors cannot be reliably modelled.In this research the relaxation of the restraint effects, due to both sudden and slow settlement of a support, was examined as a function of time; the relaxation of the restraint effect due to a thermal gradient was also investigated. In particular, was observed that the relaxation was fairly rapid in a heated beam. The relaxation of restraint effects caused by the settlement of supports was also considerable.",
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Long term tests of reinforced concrete beams loaded by temperature gradient or settlement of a support. / Jokela, Jukka.

In: Nuclear Engineering and Design, Vol. 133, No. 1, 1992, p. 113-120.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

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AU - Jokela, Jukka

PY - 1992

Y1 - 1992

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AB - The creep of concrete has a considerable influence on the relaxation of the restraint effects and restraint stresses; particularly if the temperature of the concrete is higher than normal. The risk of cracking, for example, caused by the settlement of supports, is also diminished owing to creep; particularly if the rate of restrained displacement (settlement of a support) is slower than the rate of creep. It is difficult to consider the effect of relaxation from a calculational point of view, because the time dependences of several factors cannot be reliably modelled.In this research the relaxation of the restraint effects, due to both sudden and slow settlement of a support, was examined as a function of time; the relaxation of the restraint effect due to a thermal gradient was also investigated. In particular, was observed that the relaxation was fairly rapid in a heated beam. The relaxation of restraint effects caused by the settlement of supports was also considerable.

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