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Experimental Study on Flexural Behavior of Reinforced Concrete Beams Strengthened with Ferrocement

Author: LongLingXiao
Tutor: ShangShouPing
School: Hunan University
Course: Structural Engineering
Keywords: R C beams Ferrocement Steel bar mesh Strengthening Secondary load Limit failure
CLC: TU375.1
Type: Master's thesis
Year: 2005
Downloads: 97
Quote: 16
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Abstract


Ferrocement is a type of thin layer to reinforce concrete structure, where usually hydraulic cement is reinforced with layers of continuous and relatively small diameter steel bar mesh. The mesh can be made of metallic materials or other suitable materials. Studies have shown that ferrocement have emerged as a viable, cost-effective method in strengthening R C members.The thesis deals with the response of ferrocement with wire bar as flexural strengthening material for reinforced concrete beams. The experiment of the study involved testing of 10 RC beams strengthened in flexure and 2 control specimen without strengthened. The strengthening results of reinforced with U-shape ferrocement have been analyzed. Mid-span deflection, crack width and strains in the steel were measured during the course of the test. And the performance of the tested beams and modes of failure are presented and discussed in this thesis. The test results confirm that ferrocement can be used to significantly increase the flexural capacity, raise crack-resisting capacity and improve the bending stiffness of RC beam.The thesis also base on the experiments to the felted capability of the ferrocement with bar meshes strengthening material for reinforced concrete blocks. The experiment of the study involved testing of 16 RC blocks strengthened with pins and 4 control specimens without pins. It issues of the pins’ amount, diameter, depth and distance’s effects to the felted capability of ferrocement. The result of the experiments shows that the pin benefit to improve the capacity for mucosity and ductility. Then the thesis provide a method for reckoning the mucosity capacity of the block.In the theoretical part of the thesis, the analytical model based on a strain compatibility and equilibrium of internal forces, analysis all specimens that consider secondary load and provide the equations of yield load, ultimate load. In the analysis of limit failure, the equations of the maximal ratio of reinforcement with ferrocement under once stress are provided. And the study finds that traditional analytical model can predict accurately the behavior of the specimens.At last, the strengthening technology using ferrocement was presented.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures > Girder
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