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Flexural post-cracking creep behaviour of macro-synthetic and steel fiber reinforced concrete

機(jī)譯：大合成鋼纖維混凝土的彎曲后開裂蠕變行為

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摘要

In this paper the post-cracking creep behaviour of FRC beams under flexural load is evaluated in order to determine whether under certain loading conditions plastic fibres may be safely used in the long-term without compromising the serviceability requirements. For that, an experimental program was conducted that involved the testing of 30 beams with dimensions of 150 × 150 × 600 mm reinforced either with plastic or steel fibres. The creep test setup consisted in a four-point bending test in previously cracked beams up to crack widths of 0.25, 1.50 and 2.50 mm. The sustained load ranged between 50 and 60 % of the cracking load and was applied by means of a lever system. The sustained load was controlled throughout the test with a load cell. The tests were performed under two different environmental conditions during 6 months. Despite the large deformations exhibited by plastic fibres under sustained load over time, their use as reinforcement should not be discarded as long as the effects of creep are considered in the design.
機(jī)譯：在本文中，評(píng)估了FRC梁在彎曲載荷下的開裂后蠕變行為，以確定在某些載荷條件下是否可以長(zhǎng)期安全使用塑料纖維而不會(huì)影響使用壽命。為此，進(jìn)行了一項(xiàng)實(shí)驗(yàn)計(jì)劃，涉及測(cè)試30根尺寸為150×150×600 mm的梁，這些梁用塑料或鋼纖維加固。蠕變測(cè)試設(shè)置包括對(duì)先前破裂的梁進(jìn)行四點(diǎn)彎曲測(cè)試，直至破裂寬度為0.25、1.50和2.50 mm。持續(xù)載荷在裂化載荷的50％到60％之間，并通過杠桿系統(tǒng)施加。在整個(gè)測(cè)試過程中，使用稱重傳感器控制持續(xù)負(fù)載。測(cè)試在兩個(gè)不同的環(huán)境條件下進(jìn)行了6個(gè)月。盡管塑料纖維在承受持續(xù)載荷的過程中會(huì)出現(xiàn)較大的變形，但只要在設(shè)計(jì)中考慮了蠕變的影響，就不應(yīng)放棄將其用作增強(qiáng)材料。

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