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首页> 美国卫生研究院文献>Materials >The Application of Ni–Ti SMA Wires in the External Prestressing of Concrete Hollow Cylinders
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The Application of Ni–Ti SMA Wires in the External Prestressing of Concrete Hollow Cylinders

机译：Ni-Ti SMA线在混凝土空心缸外预应力中的应用

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摘要

An innovative method for prestressing structural elements through the use of shape memory alloys (SMAs) is gaining increasing attention in research as this method does not require the use of mechanical anchorages for tendons. The activation of the memory effect by means of temperature variations (Joule effect) in effect produces high stresses in SMA components attached to concrete components as reported in the literature. This paper presents the work performed for the purpose of prestressing concrete hollow cylinders with the use of nickel–titanium (Ni–Ti) SMA wires. In the tests, a variety of hollow cylinders were made using the same concrete mix and with the same wall thickness (20 mm), but with different external diameters (200 mm, 250 mm, and 300 mm). Their prestressing was achieved by the means of Ni-Ti SMA wires of different diameters (1 mm, 2 mm, and 3 mm) wrapped around the cylinders. Longitudinal and circumferential strain during the thermal activation of the SMA wires by Joule heating was measured using gauges located on the internal surface of the hollow cylinders. The experimental protocol, recorded observations, and discussion of the effectiveness of the prestressing of concrete elements as a function of the test parameters are included in the text in detail. Comments on the conditions for effective prestressing of concrete cylinders with SMA wires are proposed in the conclusions of the paper.
机译：通过使用形状记忆合金（SMA）通过使用形状记忆合金（SMA）的创新方法在研究中获得了越来越长的关注，因为这种方法不需要使用用于肌腱的机械锚固。通过温度变化（焦耳效应）激活内存效果的活化在文献中报道的混凝土部件上的SMA部件中产生高应力。本文介绍了采用镍 - 钛（Ni-Ti）SMA线预应力混凝土空心气缸的目的进行的工作。在测试中，使用相同的混凝土混合物和相同的壁厚（20mm）制造各种空心圆柱体，但外径不同（200mm，250mm和300mm）。通过缠绕在气缸周围的不同直径（1mm，2 mm和3毫米）的Ni-Ti SMA线的方法实现了它们的预应力。使用位于空心圆柱体的内表面上的仪表测量通过焦耳加热的SMA线的热激活的纵向和周向应变。实验方案，记录的观察和讨论具体元件的预应力作为测试参数的函数的效果，详细包括在文本中。本文的结论，提出了对具有SMA线的混凝土汽缸有效预应力的条件的评论。

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