A CALCULATION METHOD OF THE INTERFACE BOND STRENGTH OF REACTIVE POWDER CONCRETE FILLED IN STEEL TUBES
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摘要: 为研究钢管活性粉末混凝土（RPC）的粘结滑移机理，对10个钢管约束RPC试件进行单轴推出试验，分析了试件的破坏特征、荷载-滑移曲线和钢管应变，探讨了长径比、径厚比以及RPC强度的影响规律，结果表明：套箍系数较小时，荷载-滑移曲线有明显的下降段，较大时未出现下降；粘结强度总体随径厚比的减小和长径比的增大而提高，RPC强度的影响不明显；当粘结应力达到粘结强度时，钢管的横向变形系数超过泊松比，其约束作用开始发挥。在此基础上，建立了钢管内压力与粘结应力的关系，并通过试验数据回归提出了钢管约束RPC粘结强度计算模型，公式计算与试验结果符合较好。
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关键词:
- 钢管组合柱 /
- 活性粉末混凝土(RPC) /
- 破坏机理 /
- 界面粘结性能 /
- 粘结强度计算
Abstract: To study the bond-slip mechanism of reactive powder concrete (RPC) filled in steel tubes, ten push-out tests were carried out on RPC filled in steel tube specimens. The failure patterns, load-slip curves and steel tube strains of specimens were analyzed. The effects of the length-diameter ratio, radius-thickness ratio and RPC strength on the bond strength are discussed. The results show that there is a sudden drop on the load-slip curves of specimens with small confinement coefficients, while the load capacity increases after the knee of the curves for specimens with large confinement coefficients. The bond strength basically increases with the decrease of the length-diameter ratio and the increase of the radius-thicknessratio. The effect of the RPC strength is not obvious. The steel tube begins to provide RPC confinement when the strain ratio εsh/εsv of steel tube is larger than its Poisson's ratio. The relationship between the internal pressure of the steel tube and the bond stress is established, and the calculation method of the interface bond strength of RPC confined by steel tubes is proposed based on the experimental results. The calculated results are in good agreement with those of the model test. -
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