基于格构模型理论的单纤维拉拔试验建模及仿真OA北大核心CSTPCD

The single fiber pull-out test of cement-based materials requires mechanical loading instruments with high precise,but the test operation is complicated,thus many laboratories do not have the ability to test.In order to slove this question,the discrete lattice model was adopted to simulate the pull-out process of single fiber from cementitious matrix using the stepwise method,and the fiber pull-out load-displacement response curve was obtained.The model was verified by the experimental data in the literature,and it is found that the simulation method can simulate the single fiber pull-out process and load-displacement curve.The influences of fiber direction,elastic modulus of fiber and interfacial bond strength on the pull-out load-displacement response curve were investigated using the model.The simulation results can be further used to study the influences of various factors on test results under different boundary conditions.The simulated results can be used to calculate the single-crack fiber bridging relationship of engineered cement-based composite,providing theoretical support for design of high toughness engineering cement-based composites.