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Experimental Study on the Axial Mechanical Behavior of Preloaded Circular Concrete Columns with CFRP Confinement

Author: JinJianPing
Tutor: HeZheng
School: Northeastern University
Course: Structural Engineering
Keywords: CFRP Constraint Reinforcement Column Load stress Expansion ratio Reinforced concrete Loading device
CLC: TU375.3532.3
Type: Master's thesis
Year: 2008
Downloads: 54
Quote: 5
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Abstract


CFRP sheet has the advantages of high strength, lightweight, corrosion-resistant, anti-fatigue, non-magnetic, convenient construction, in the past few decades has been widely used in reinforced concrete structures repair and reinforcement, CFRP confined concrete columns concrete is to the state of compression, can greatly improve the compressive strength and ductility of concrete columns, therefore reinforced concrete columns for CFRP constraints have been widely carried out, and have achieved fruitful results, however, existing research mostly for not newly poured concrete structure, its load and load confined concrete is still in the initial stage, the load may be caused by constraints reinforced concrete column performance changes are not yet understood, can not completely uninstall view of coagulation ten members before reinforcement and the need for load reinforcement conditions, four groups of 29 concrete cylindrical CFRP with set constraints experimental study and theoretical analysis. Taking into account the load process CFRP sheet take a relatively long curing time, commonly used in hydraulic loading equipment such as hydraulic jacks can not be a long time to load, we designed two sets of long-term to maintain a constant load loading device, in addition to speed up the test progress also increased for 100mm diameter concrete columns two 100-ton mechanical jacks, four groups of specimens load stress level the CFRP constraints of different cross-sectional dimension of plain concrete and reinforced concrete cylinder two-stage (not confined concrete pre- loading stage and CFRP confined concrete loading stage) axial compressive loading, and on an experimental basis on specific detailed analysis of the load stress level, cross-sectional dimensions and reinforcement bring the ultimate bearing capacity of the constrained column, failure pattern and ductility the impact. The test results show that the: CFRP constraints for greatly enhancing the capacity and ductility of concrete columns, but the destruction of CFRP confined concrete column performance due to to brittle material CFRP pull off as a symbol still a distinct brittle; With load stress level increased from 0 to 0.85, CFRP band set out to reduce the ultimate bearing capacity of concrete cylinders increase, estimated from the load stress level increased to reduce the transition at this article about 0.7; CFRP with the concrete cylinders limit axial strain with the load raise the level of stress first increases and then decreases, and limit expansion ratio With the improvement of load stress level decreases first and then increase, the trend turning point occurred in the load stress level is equal to the constraint than. The paper combines the test results of a comparative analysis of existing FRP confined concrete ultimate axial compressive strength model, ultimate axial compressive strain model, expansion ratio model and longitudinal stress - strain model, and then based on test results, limit anti-CSAS806-02 model based on the compressive strength, the ultimate compressive strength of FRP confined reinforced concrete consider the impact load model by introducing the concept of so-called \than the impact factor, Teng et al., Lam and Teng for not load proposed model based on, the corresponding the limit axis strain model, the expansion ratio model and longitudinal stress - strain model, the proposed model is very good agreement The results of this article. Finally, the design proposals for load confined concrete columns.

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