1.1 本规程规定了用试验方法测试的支撑纤维增强混凝土梁各端的轴颈轴承型滚柱的设计 1399米/1399米 或测试方法 1609/1609米 辊子设计旨在在梁支撑处提供一致且相对较低的有效摩擦系数值。轴承设计采用了润滑脂润滑的金属对金属滑动表面。 注1: 在测试过程中，梁的下侧在加载的第三点之间出现裂缝，导致梁的每个部分的下侧远离中心。该设计旨在响应于该运动，在与测试梁接触的点处提供滚筒的无限旋转。 注2: 支撑辊的设计是决定弯曲试验结果误差的拱力大小的重要因素。 2. 设计不当的支撑辊会影响纤维增强混凝土梁的表观弯曲性能。 3. 有效摩擦系数可以使用类似于Bernard所述的方法来确定。 4. 1.2 本标准文本指提供说明材料的注释和脚注。这些注释和脚注（不包括表和图中的注释和脚注）不应视为本标准的要求。 1.3 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。每个系统中所述的值不一定完全相等；因此，为了确保符合标准，每个系统应独立使用，两个系统的值不得合并。 1.4 本标准并不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建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 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《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 4.1 在测试纤维增强混凝土梁时使用的支撑辊中存在摩擦将增加梁的表观荷载阻力。根据本实践设计的辊子支撑将在支撑处提供相对较低且一致的摩擦值。 4.2 两种类型的辊子用于支撑梁。一种包括圆柱轴承，该圆柱轴承允许滚子组件沿着平行于梁的纵向轴线的轴线旋转，从而适应在样品制造期间引入的任何翘曲。另一个滚柱不包括圆柱轴承。 4.3 辊子设计用于150 mm[6 in.]或100 mm[4 in.]深的方形截面梁。 4.4 提供了一种方法，用于用已知的滚子支撑件的有效摩擦系数值来校正使用滚子测量的表观负载电阻，以获得在没有摩擦的情况下的负载电阻的估计值。

1.1 This practice prescribes the design of journal-bearing type rollers to support each end of fiber-reinforced concrete beams tested using Test Method C1399/C1399M or Test Method C1609/C1609M . The roller design is intended to provide a consistent and relatively low value of effective coefficient of friction at the beam supports. The bearing design incorporates metal-on-metal sliding surfaces lubricated with grease. Note 1: During the progress of a test, a crack or cracks open on the underside of the beam between the loaded third points causing the underside of each portion of the beam to move away from the center. The design is intended to provide for unlimited rotation of the roller at the point of contact with the test beam in response to this motion. Note 2: The design of the supporting rollers is a significant factor in determining the magnitude of the arching forces that cause error in flexural test results. 2 Improperly designed supporting rollers can influence the apparent flexural behavior of fiber-reinforced concrete beams. 3 The effective coefficient of friction can be determined using a method similar to that described by Bernard. 4 1.2 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.3 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. 1.4 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. 1.5 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 ====== 4.1 The presence of friction in the supporting rollers used when testing a fiber-reinforced concrete beam will increase the apparent load resistance of the beam. Roller supports designed in accordance with this practice will provide a relatively low and consistent value of friction at the supports. 4.2 Two types of rollers are used to support a beam. One includes a cylindrical bearing that allows the roller assembly to rotate along an axis parallel to the longitudinal axis of the beam and thereby accommodate any warping introduced during specimen fabrication. The other roller does not include the cylindrical bearing. 4.3 The rollers are designed for use with 150 mm [6 in.] or 100 mm [4 in.] deep beams of square cross-section. 4.4 A method is provided for correcting the apparent load resistance measured using the roller with a known value of the effective coefficient of friction of the roller supports to obtain an estimate of the load resistance in the absence of friction.