混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究

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王立成,李龙龙,梁永钦.混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究[J].,2016,56(6):608-615

混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究

Experimental study of radial pressure of concrete cover on bond behavior of ribbed steel bars

DOI：10.7511/dllgxb201606008

中文关键词:带肋钢筋混凝土握裹层约束作用劈裂破坏机械咬合作用

英文关键词:ribbed steel bars concrete cover confinement splitting bond failure mechanical interaction

基金项目:“九七三”国家重点基础研究发展计划资助项目(2015CB057703)；国家自然科学基金资助项目(51378090).

作者	单位
王立成,李龙龙,梁永钦

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中文摘要:

对于带肋钢筋的黏结性能，钢筋横肋与混凝土之间的咬合力起控制作用．混凝土握裹层的径向压力是研究带肋钢筋横肋与混凝土之间相互作用的重要条件．通过拉拔黏结试验测量了劈裂破坏过程中混凝土握裹层作用在带肋钢筋上的径向压力．试验中，在钢筋内开槽布置两个微型荷载传感器测量混凝土握裹层的径向压力，通过对6个试件开展拉拔黏结试验测定了不同厚度混凝土握裹层的约束作用．试验发现，在试件劈裂破坏过程中，钢筋肋前有效角不断变小，黏结应力与混凝土握裹层的径向压力成正比；试件劈裂破坏时，钢筋肋前有效角与保护层厚度成反比，黏结应力沿锚固段的分布受到保护层厚度的影响当保护层厚度适中时，黏结应力分布均匀．另外，试验测得的混凝土握裹层径向压力最大值与考虑裂缝黏聚力的厚壁圆筒理论模型预测值吻合较好．

英文摘要:

Bond behavior between concrete and ribbed steel bars is governed by interlocking force between concrete and transverse ribs. The radial pressure of concrete cover is an essential condition that studies the interaction between the transverse ribs of ribbed steel bars and concrete. Pull-out tests were carried out to measure the radial pressure of ribbed steel bars acted by concrete cover for the case of splitting bond failure. In this test two micro-load transducers embedded in the grooved steel bar were positioned to measure the radial pressure of concrete cover. The pull-out tests of a total of six specimens were conducted to obtain the confinement with different cover thicknesses. In the experiment, it is found that during the process of splitting bond failure the effective rib face angle gradually decreases and the bond stress is directly proportional to the radial pressure of concrete cover. When approaching to the splitting bond failure, the effective rib face angle is inversely proportional to the thickness of concrete cover. The distribution of bond stress along anchorage length of steel bar is influenced by the thickness of concrete cover. The appropriate thickness of concrete cover will lead to a uniform distribution of bond stress. Additionally, the maximum radial pressure of concrete cover measured experimentally is in good agreement with that predicted by thick-wall cylinder model, which takes the cohesive force of cracks into account.

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混凝土握裹层径向压力对带肋钢筋黏结性能影响试验研究

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