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Effect of the bond and dowel action of main bar on the shear behavior of RC members

主杆的粘结和销钉作用对钢筋混凝土构件抗剪性能的影响

基本信息

批准号：
02650394
负责人：
KOBAYASHI Katsumi
金额：
$ 1.41万
依托单位：
Fukui University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650394/
关键词：
Shear capacity Shear reinforcing Dowel action Bond action Crack Analytical model

项目摘要

In this study, the dowel and the bond action of the main bar in reinforced concrete members were examined experimentally and their effects on the shear capacity, the failure mode and the shear transfer mechanism were discussed.At first, the preparatory analyses were made considering the shear crack, the dowel action of main bar, the splitting crack along the main bar and the bond deterioration. On the basis of the analytical results, the shear capacity tests of reinforced concrete members were planned. The dowel shear force, the bond stress, the stresses of shear reinforcements and so on were measured in detail. And their relations to the shear capacity and the failure modes were discussed. As a result, experimental results well agreed with the analytical predictions and the suitability of the analytical model could be confirmed.From the analytical and the experimental results, it was proved that the restrain of dowel displacement of main bar could minimize the propagation of the splitting crack along the main bar. And the bond deterioration would less occur. And as a result, the large shear capacity could be obtained. Then, the intensive shear reinforcing method was proposed as a way to restrain the dowel displacement of main bar effectively. And its effectiveness was proved experimentally and analytically.Furthermore, there would be much possibility to be able to apply the intensive shear reinforcing method to the precast concrete members that have the sleeve joints at the member end. For the practical use, it must be proved that the shear capacity and the deformability can be maintained. Then in this study, the probability was proved by the pilot tests.

本文通过试验研究了钢筋混凝土构件中主筋的销钉作用和粘结作用，探讨了它们对构件抗剪能力、破坏模式和剪切传递机制的影响。首先，对剪力裂缝、主筋的销钉作用、沿主筋的劈裂裂缝和粘结劣化进行了初步分析。在分析结果的基础上，规划了钢筋混凝土构件抗剪承载力试验。详细测量了销钉剪力、粘结应力、剪筋应力等参数。讨论了它们与抗剪能力和破坏模式的关系。实验结果与分析预测结果吻合较好，证实了分析模型的适用性。分析结果和试验结果表明，对主杆销钉位移进行抑制可以使劈裂裂纹沿主杆的扩展达到最小。债券恶化的情况也会减少。从而获得较大的抗剪承载力。在此基础上，提出了强剪加固法作为有效抑制主筋销钉位移的一种方法。并通过实验和分析验证了该方法的有效性。此外，将强剪加固方法应用于构件端有套筒连接的预制混凝土构件将有很大的可能性。为了实际应用，必须证明其抗剪能力和变形能力是可以保持的。然后在本研究中，通过先导试验证明了该概率。