钢纤维混凝土桩基承台三维非线性有限元分析

3D Nonlinear Finite Element Analysis of SPRC Pile Cap

应用有限元法对钢纤维混凝土桩基承台的非线性性能进行了分析研究。针对钢纤维混凝土的破坏特征，基于混凝土Ｏｔｔｏｓｅｎ四参数模型，建立了钢纤维混凝土强度破坏准则。考虑材料的弹塑性性能、钢筋和钢纤维混凝土之间的粘结作用及裂缝对构件的影响，编制了非线性分析程序。用该程序分析了承台的开裂荷载、极限荷载以及承台中点挠度，计算与试验结果基本一致。

Nonlinear properties of steel-fiber reinforced concrete (SFRC)pile cap are discussed by nonlinear finite element anlaysis. According to the failure characteristics of SFRC, a failure criterion has been developed based on the four-parameter Otttoseris model. The elastic-plastic property of material and the bond-slip between reinforcement and SFRC as well as influence on the pile cap by cracks are taken into consideration. Then a program for nonlinear analysis is compiled. The craking load, ultimate load and centrepoint deflection of pile cap are discussed. The experimental results are in accordance with the results calculated by the program.