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. 1.2 FRP bent bars are often used in reinforced concrete applications to shorten the development length of the bar or act as a stirrup to resist shear forces. Bent bars can be produced with varying angles of bend to fit their intended purpose. 1.3 For this test method, the FRP bars are normally bent 90. The bars normally include a surface treatment to facilitate the bond between the bar and the concrete. 1.4 The strength values provided by this test method are short-term quasi-static strengths that do not account for sustained static or cyclic loading. Additional material characterization may be required, especially for bars that are to be used under high levels of sustained or repeated loading. 1.5 The values stated in either SI or inch/pound units shall be regarded separately as the standard. The values stated in each system are not exact equivalents; therefore each system shall be used independently of each other. Combining values from the two systems may result in nonconformance with the standard. 1.5.1 Within the text, the inch-pound units are shown in brackets. 1.6 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 and health practices and determine the applicability of regulatory limitations prior to use.
Need to transition American Concrete Institute Test Method B.5 to ASTM D30 per agreement between ACI and ASTM.
Keywordsbend capacity; fiber-reinforced polymer; FRP; stirrup; bent bar
The title and scope are in draft form and are under development within this ASTM Committee.Back to Top
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