1.1 本试验方法描述了由纤维增强聚合物（FRP）复合材料形成的单搭接剪切接头的样品制备和拉伸试验要求，纤维增强聚合物复合材料通常用于加固由金属、木材、砖石和钢筋混凝土等材料制成的结构。该方法的目的是通过施加远场拉力来确定重叠拼接接头的表观剪切强度。该方法适用于现场或实验室环境中制造的湿铺FRP材料系统。FRP复合材料可以是单向（0°）或交叉- 帘布层（0/90型）钢筋。对于交叉层压板，可以使用0°或90°的多层单向纤维，或一层或多层缝合或编织0/90织物来实现结构。复合材料形式限于连续纤维或不连续纤维增强复合材料，其中层压板相对于测试方向是平衡和对称的。该方法通常用于确定所需重叠拼接的长度，以确保在远离拼接的材料中而不是在拼接连接本身中发生张力失效。 1.2 以国际单位制或英寸磅单位表示的数值应单独视为标准。每个系统中规定的值可能不是精确的等效值；因此，每个系统应独立于其他系统使用。将两个系统的值组合在一起可能会导致不符合标准。 1.2.1 在文本中，英寸磅单位显示在括号中。 1.3 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者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。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 当现场条件禁止连续接触结构元件时，或者当FRP复合材料的指定长度使得整个长度的饱和和放置将很麻烦时，重叠拼接用于FRP复合材料现场应用。 该方法可用作质量控制机制，以确保在现场条件下建造的重叠拼接满足或超过设计工程师或FRP系统制造商制定的要求。饱和剂混合法和纤维饱和法都可以用于湿法叠层FRP系统。 5.2 在解释通过该方法获得的表观剪切强度结果时，建议谨慎。在测试过程中，单剪切搭接接头在搭接区域内产生不均匀的剪切应力分布。关于搭接剪切试验结果的解释和使用的附加指南见 第4896页 . 5.3 该试验方法侧重于玻璃钢材料本身，而不考虑夹紧方法。因此，任何一个夹点的失效或拔出所产生的强度都被忽略。强度测量仅基于在量规部分（远离夹具）或接头处失败的试样。

1.1 This test method describes the requirements for sample preparation and tensile testing of single-lap shear splices formed with fiber-reinforced polymer (FRP) composite materials commonly used for strengthening of structures made of materials such as metals, timber, masonry, and reinforced concrete. The objective of this method is to determine the apparent shear strength of an overlap splice joint through the application of a far-field tensile force. The method applies to wet lay-up FRP material systems fabricated on site or in a laboratory setting. The FRP composite may be of either unidirectional (0°) or cross-ply (0/90 type) reinforcement. For cross-ply laminates, the construction may be achieved using multiple-layers of unidirectional fibers at either 0 or 90°, or one or more layers of stitched or woven 0/90 fabrics. The composite material forms are limited to continuous fiber or discontinuous fiber-reinforced composites in which the laminate is balanced and symmetric with respect to the test direction. The method is often used to determine the length of the overlap splice needed to ensure that a tension failure occurs in the material away from the splice rather than the splice connection itself. 1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.2.1 Within the text, the inch-pound units are shown in brackets. 1.3 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. 1.4 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 Overlap splices are used in field applications of FRP composites when site conditions prohibit continuous access to a structural element or when the specified length of the FRP composite is such that saturation and placement of the entire length would be cumbersome. This method can be used as a quality control mechanism for ensuring that overlap splices constructed under field conditions meet or exceed the requirements established by the design engineer or FRP system manufacturer. Both the saturant mixing and fiber saturation method can be verified for wet-layup FRP systems. 5.2 Caution is recommended when interpreting apparent shear strength results obtained from this method. Single shear lap splices develop non-uniform shear stress distributions within the overlap splice region during testing. Additional guidance on the interpretation and use of results obtained from lap shear testing is found in D4896 . 5.3 This test method focuses on the FRP material itself, irrespective of gripping method. Therefore, strengths resulting from failure or pullout at either grip are disregarded. The strength measurements are based solely on test specimens that fail in the gauge section (away from the grips) or at the splice.