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Strain rate effect on the tensile behaviour of textile-reinforced concrete under static and dynamic loading

机译：静态和动态载荷下应变率对纤维增强混凝土拉伸性能的影响

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摘要

This paper presents the results of an experimental investigation into the strength, deformation, and fracture behaviour of textile-reinforced concrete (TRC) subjected both to low and high-rate tensile loading ranging from 0.0001 to 50 s~(-1). High strain rates were achieved using a high-rate servo-hydraulic testing machine. The effect of the addition of short fibres on the static and dynamic response of TRC has been investigated, and the microstructure of both composite and fibre was observed after the tests using an ESEM. An increase in tensile strength, strain capacity, and work-to-fracture was observed for strain rates up to 0.1 s~(-1) with increasing strain rate. The addition of short glass fibres increased the tensile strength and first crack strength of the TRC. For high-speed tests (rates above 5s~(-1)) an increase in the tensile strength, first crack strength and work-to-fracture was also observed, but at the same time there was a decrease in the strain capacity. The tests at high loading rates showed a pronounced effect of the specimen length on the measured mechanical properties: with increasing gauge length the tensile strength and strain capacity decreased, while the work-to-fracture increased.
机译：本文介绍了对纺织增强混凝土（TRC）在0.0001至50 s〜（-1）的低速和高速拉伸载荷下的强度，变形和断裂行为进行实验研究的结果。使用高速伺服液压测试机可实现高应变率。研究了添加短纤维对TRC静态和动态响应的影响，并在使用ESEM测试后观察到复合材料和纤维的微观结构。随着应变速率的增加，应变速率高达0.1 s〜（-1）时，抗拉强度，应变能力和断裂功均增加。短玻璃纤维的添加增加了TRC的拉伸强度和首次断裂强度。对于高速测试（速率超过5s〜（-1）），还观察到了抗拉强度，第一抗裂强度和断裂功的增加，但同时应变容量却降低了。在高加载速率下的测试表明，试样长度对测得的机械性能有显着影响：随着标距的增加，抗拉强度和应变能力降低，而断裂功却增加。

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