Experimental Study And Theoretical Analysis On Strengthening Reinforced Concrete Beams With High-performance Ferrocement

High-performance ferrocement is a type of thin layer for reinforcing concrete structures, where usually high-performance cement is reinforced with layers of continuous and relatively small diameter steel bar mesh. This dissertation focuses on the systemic experiments and theoretical analysis on strengthening reinforced concrete beams with high-performance ferrocement. The main research content and achievements can be summed up in the following aspects:1. Experimental study on flexural strengthening of beams with ferrocement: Based on the tests of sixty-three beams, the performance of beams flexural strengthening with ferrocement has been tested. The beams under secondary loading (namely the preloading was not removed) are firstly studied in this dissertation, and the ultimate strength, stiffness, and the distribution of cracks of the beams strengthened with ferrocement have been analyzed. Mid-span deflection, crack width and strains of steel were measured during the course of the test, and performances of the beams are compared and assessed with particular emphasis on cracking behavior, mid-span deflection, ultimate strength capacity, the modes of failure and so on. The results show that ferrocement obviously contributes to the increase of the load-bearing capacity, raises the crack-resisting capacity and improves the bending stiffness of RC beams.2. Theoretical analysis on flexural strengthening of beams with ferrocement: Based on the tests beams, the design issues of strengthening reinforced concrete beams using ferrocement have been provided. The equations of brittle ratio, ultimate load and vertical deflection have been inferred too. At last, it is shown in the conclusion that the theoretical equations share a good agreement with the experimental results of the tested beams. By statistical analysis to the number of experimental data, this dissertation puts forward the profile ferrocemnet influence coefficient of ultimate load and vertical deflection for the first time. And the analytical model based on a strain compatibility and equilibrium of internal forces, as well as the all of the specimens using the model in order to compare the analytical results with the experimental results have been provided. And the study shows that traditional analytical model can accurately predict the behavior of the specimens. The analytical solutions of the bond shear and normal stresses in the...