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Standard Test Method for Strength of Fiber Reinforced Polymer (FRP) Bent Bars in Bend Locations 弯曲位置纤维增强聚合物(FRP)弯曲杆强度的标准试验方法
发布日期: 2021-01-01
1.1 本试验方法确定了通常用作钢筋、预应力或后张混凝土结构中箍筋锚固的纤维增强聚合物(FRP)复合弯曲钢筋的准静态极限强度。本试验方法仅适用于具有实心横截面的钢筋。 1.2 FRP弯曲钢筋通常用于钢筋混凝土应用中,以缩短钢筋的延伸长度,或作为拉杆或箍筋来抵抗剪切力。弯曲钢筋可以通过不同的弯曲角度来生产,以符合其预期用途。 1.3 对于本试验方法,将FRP钢筋弯曲90度。通常,钢筋具有规则的表面起伏图案、粘结颗粒涂层或两者兼有,促进钢筋和混凝土之间的机械联锁。 1.4 本试验方法可在根据规范生产的标准棒材上完成 D7957/D7957M . 在这种情况下,标称横截面积和有效直径取自 D7957/D7957M . 该试验方法也可用于未标准化的钢筋。在这种情况下,应按照试验方法中的说明测量和计算横截面积和有效直径 D7205/D7205M . 1.5 该方法提供的强度值为短期准静态抗拉强度,不考虑持续静态或循环载荷。如果在高水平持续或重复荷载下使用钢筋,可能需要额外的材料表征。 1.6 从本试验方法中获得的特征值旨在表示尾长为12个钢筋直径的FRP弯曲钢筋的准静态极限强度。 1.7 单位- 以国际单位制或英寸-磅单位表示的数值应单独视为标准值。 每个系统中规定的值不一定是精确的等价物;因此,为确保符合本标准,每个系统应独立使用,且两个系统的值不得组合。 1.7.1 在文本中,英寸-磅单位显示在括号中。 1.8 本标准并非旨在解决与其使用相关的所有安全问题(如有)。本标准的用户有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.9 本国际标准是根据世界贸易组织技术性贸易壁垒(TBT)委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本试验方法旨在确定FRP复合混凝土钢筋的弯曲强度,该钢筋是在标准12钢筋直径的嵌入件上开发的。从该测试中,获得了设计所需的各种数据。影响钢筋拉伸响应的材料相关因素包括:组成材料、孔隙含量、钢筋体积百分比、制造方法和纤维增强结构。同样,与测量的钢筋拉伸响应相关的因素包括试样制备、试样调节、测试环境、试样对齐和测试速度。研究结果可用于材料规范、研发、结构设计和分析。 注1: 本试验方法同时测试了两个FRP弯管,但在某些情况下,只有一个弯管可能会失败。 在导致有效失效的同时,应注意,仅对一个弯曲进行了有效测量,并且使用该方法的最终编译测试结果可能与单个FRP弯曲测试结果不同。
1.1 This test method determines the quasi-static ultimate strength of fiber reinforced polymer (FRP) composite bent bars commonly used as anchorages for stirrups in reinforced, prestressed, or post-tensioned concrete structures. This test method only applies to bars with a solid cross section. 1.2 FRP bent bars are often used in reinforced concrete applications to shorten the development length of the bar or to act as a tie or a stirrup to resist shear forces. Bent bars can be produced with varying angles of bend in order to fit their intended purpose. 1.3 For this test method, the FRP bars are bent at a 90 degree angle. In general, bars have a regular pattern of surface undulations, a coating of bonded particles, or both, that promote mechanical interlock between the bar and concrete. 1.4 This test method may be completed on standardized bars, produced according to Specification D7957/D7957M . In this case, the nominal cross-sectional areas and effective diameters are taken from D7957/D7957M . This test method may also be used for bars that are not standardized. In this case, the cross-sectional areas and effective diameters should be measured and calculated as described in Test Method D7205/D7205M . 1.5 The strength values provided by this method are short-term, quasi-static tensile strengths that do not account for sustained static or cyclic loading. If bars are to be used under high levels of sustained or repeated loading, additional material characterization may be required. 1.6 The characteristic values obtained from this test method are intended to represent the quasi-static ultimate strength of FRP bent bars with a tail length of twelve bar diameters. 1.7 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined. 1.7.1 Within the text, the inch-pound units are shown in brackets. 1.8 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.9 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This test method is intended to determine the bend strength of FRP composite concrete reinforcements, developed at a standard twelve bar diameters of embedment. From this test, a variety of data are acquired that are needed for design purposes. Material-related factors that influence the tensile response of bars include the following: constituent materials, void content, volume percent reinforcement, methods of fabrication, and fiber reinforcement architecture. Similarly, factors relevant to the measured tensile response of bars include specimen preparation, specimen conditioning, environment of testing, specimen alignment, and speed of testing. The results may be used for material specifications, research and development, and structural design and analysis. Note 1: Two FRP bends are tested simultaneously in this test method, but in some cases, only one bend may fail. While resulting in a valid failure, notice should be taken that only one bend has been effectively measured and that the final compiled test results using this method could differ from those resulting from single FRP bend testing.
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归口单位: D30.10
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