Pullout response of a smooth fiber with an end anchorage

The main objective of this study is to develop an analytical model to predi ct the pullout load versus end slip relationship of a smooth fiber having a n end anchorage embedded in a matrix. The resisting pullout load of the fib er is composed of a component due to interfacial bond at the fiber-matrix i nterface and a component due to mechanical anchorage at the embedded end of the fiber. The concept of a relationship between the bond shear stress and the slip at the fiber-matrix interface is used to obtain the force compone nt due to the interfacial bond. To account for the mechanical anchorage res istance at the embedded end, a spring component at the embedded end of the fiber is used. The constitutive property of the spring is assumed to be non linear. Based on these concepts and assumptions, a set of analytical soluti ons to predict the pullout load vesus end slip relationship is derived and then solved by an iterative procedure. Examples predicting the pullout load versus slip curve of a smooth fiber with and without mechanical anchorage at the embedded end are shown and compared. Different modeling aspects of t he fiber end anchorage effect and its influence on the pullout load Versus slip response are investigated and discussed, with particular emphasis on t he tensile force and the bond shear stress distribution along the fiber-mat rix interface.