FRP筋与混凝土粘结滑移数值模拟

目的对FRP筋与混凝土粘结滑移性能进行数值模拟.方法利用ANSYS非线性有限元程序,对混凝土、FRP筋以及两者之间的粘结滑移作用分别采用不同的单元类型,考虑各材料及其之间的本构关系,对FRP筋混凝土拉拔试件建立分离式的有限元模型,并对其进行计算分析,进一步将计算结果与试验结果进行对比分析.结果对比研究表明,拉拔试件的荷载-加载端、自由端滑移曲线与试验曲线相比,两者吻合较好,且荷载-加载端滑移曲线与试验曲线的吻合程度比自由端要好.另外,模拟得到的试件极限荷载、粘结应力峰值与试验结果均吻合较好,而其相对应的滑移计算值与试验结果相比略大.结论ANSYS非线性有限元程序能够有效地模拟FRP筋和混凝土之间的粘结滑移作用,可以得到较为准确的极限状态值,也能较为准确地模拟粘结滑移的真实受力过程.

Numerical Simulation of Bond-Slip Relationship Between FRP Bars and Concrete Based on ANSYS

The paper uses the different elements model to simulate the material properties of concrete,FRP bars and the bond-slip between them in ANSYS.Considering the constitutive relationship of concrete,FRP and bond-slip between them,the separated finite element model of concrete specimens reinforced with FRP bars is analyzed.The numerical study shows that the loading-slip of loaded and free-end curve of specimens was in good agreement with the experimental results.The results of the loaded were much better than those of the freeend.In addition,the ultimate load and bond stress were in accord with the experiment results.At the same time,the related slip was a little greater than those in pull-out test.In brief,the behaviors of bond-slip between FRP bars and concrete are effectually simulated;the ultimate values are exactly obtained and the real stress process is accurately simulated in the finite element program of ANSYS.