变形钢筋与高强轻骨料混凝土的黏结-滑移性能

研究变形钢筋与轻骨料混凝土间的黏结-滑移性能，完成了9组中心拉拔试验，分析了轻骨料混凝土强度、锚固长度、粗骨料类型及钢筋的直径对黏结应力的影响.结合试验结果，采用厚壁模型，给出了轻骨料混凝土黏结强度的解析解，并建立了钢筋与轻骨料混凝土间的黏结应力-滑移曲线本构模型.结果表明:轻骨料混凝土的黏结-滑移性能主要受砂浆强度影响，使得该类混凝土与变形钢筋间的黏结应力优于普通混凝土；黏结强度随着轻骨料混凝土的强度提高而增加，随着黏结长度的降低而增加；本文提出的本构模型能够较为准确地预测试验曲线.

Bond-Slip Behavior Between Reinforcement Bars and High-Strength Lightweight Aggregate Concrete

Nine groups of pull-out tests on the bond-slip behavior between reinforcement bars and lightweight aggregate concrete were completed.The effect of lightweight aggregate concrete strength， anchorage length， coarse aggregate type and bar diameter on bond strength was analyzed. Combined with the test results， the analytical solution of bond strength of lightweight aggregate concrete was given by using thick wall model， and a constitutive model between reinforcement and lightweight aggregate concrete was established.Test results indicate that the bond-slip behavior of the lightweight aggregate concrete is mainly affected by the mortar strength， making the bond stress between the concrete and reinforcement bars better than that between normal weight concrete and reinforcement bars. The bond strength increases with the increase of strength of lightweight aggregate concrete and with the decrease of anchorage length. The proposed bond stress-slip constitutive model shows good precision to predict test curves.