钢管与混凝土粘结-滑移相互作用的数值模拟

Numerical Simulation on Bond-slip Behavior of Concrete-filled Steel Tubes

为了探讨钢管与混凝土之间的粘结-滑移相互作用关系,在已有推出试验研究的基础上,提出了钢管与混凝土粘结-滑移本构关系的简化模型;根据简化模型,采用有限元分析软件ANSYS中非线性弹簧单元Combination39对钢管与混凝土粘结-滑移相互作用进行了数值模拟,并对钢管混凝土梁跨中、柱中截面受拉侧、受压侧钢管与混凝土应力随加载的变化过程,以及加载结束时钢管与混凝土相对滑移沿试件长度的分布规律进行了探讨。结果表明:由简化模型计算的粘结-滑移曲线与试验曲线吻合较好,数值计算得出的钢管混凝土结构受压弯作用时的M-d、P-u曲线与试验结果基本吻合,对钢管与混凝土界面受力性能及相互滑移分布规律的探讨将有助于更好地了解钢管与混凝土之间的粘结-滑移相互作用特点。

In order to discuss the bond-slip behavior between steel tube and concrete, a simplified model for the bond-slip constitutive relationship was proposed based on the test results. Nonlinear spring element named Combination39 in the ANSYS program was adopted to simulate the bond-slip behavior between steel tube and concrete. Variation process of stress of steel tube and concrete at the mid-span of beams and the mid-section of columns vs loading and the distribution rules of relative slip between steel tube and concrete along specimen length were discussed. Results show that the bond-slip curves agree well with test curves by using the simplified model. The numerical simulation results of M-d curve and P-u curve for the concretefilled steel tubes are in good agreement with experimental results when the tubes are in a state of compression bending. The primary discussion on mechanical behavior of interface and slip distribution rule will be helpful for understanding the characteristics of the bond-slip behavior between steel tube and concrete.