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Study on straight development length of tensile threaded bars in high-strength reinforced concrete members

机译：高强钢筋混凝土构件中张拉钢筋的直线发展长度研究

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The main purpose of this study is to investigate fundamental bonding behavior of high-strength reinforced concrete adopting tensile threaded bars and to verify the applicability of the formula of the straight development length as recommended in ACI 318-14 on tensile threaded bars embedded in the high-strength reinforced concrete. Additionally, appropriate surface geometric properties of threaded bars shall be defined for ensuring enough bond strength. This study conducts 42 sets of bonding tests, of which 2 sets adopt plain bars as the control group, and the remaining sets adopt threaded bars. The primary study parameters include the concrete compressive strength, the relative rib area of threaded bars involving the rib height and rib spacing, and splitting index. The test results show that when the concrete strength is limited to 70 MPa by ACI 318-14 recommendations, all sets of threaded bars can provide the expected bond strengths. However, when the concrete strength is not limited to 70 MPa, only the threaded bars with relative rib area exceeding 0.17 can provide the expected bond strengths. In addition, the correlation between relative rib area R-r and the effectiveness of the bonding performance is approximately perfect. (C) 2018 Elsevier Ltd. All rights reserved.
机译：这项研究的主要目的是研究采用拉伸螺纹钢筋的高强度钢筋混凝土的基本粘结性能，并验证ACI 318-14中推荐的直线发展长度公式对埋入高强度钢筋中的拉伸螺纹钢筋的适用性。强度的钢筋混凝土。另外，应定义螺纹杆的适当表面几何特性，以确保足够的粘结强度。本研究进行了42组粘合测试，其中2组采用普通钢筋作为对照组，其余组采用螺纹钢筋。主要的研究参数包括混凝土的抗压强度，螺纹钢筋的相对肋骨面积（涉及肋骨高度和肋骨间距）以及劈裂指数。测试结果表明，当ACI 318-14建议将混凝土强度限制为70 MPa时，所有螺纹钢筋都可以提供预期的粘结强度。然而，当混凝土强度不限于70MPa时，只有相对肋骨面积超过0.17的螺纹杆才能提供预期的粘结强度。另外，相对肋面积R-r与粘合性能的有效性之间的相关性是近乎完美的。 （C）2018 Elsevier Ltd.保留所有权利。

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