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Theoretical Study and Numerical Simulation on CFRP Strengthened R.C Two-Way Slab under Preload

Author: NingNing
Tutor: LiuZuo
School: Qingdao Technological University
Course: Structural Engineering
Keywords: Carbon fiber cloth Way Slab Concentrated load Plastic hinge line method Load Stiffness Nonlinear finite element
CLC: TU375
Type: Master's thesis
Year: 2009
Downloads: 8
Quote: 0
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Abstract


1980s , carbon fiber reinforced polymer ( CFRP ) began to be applied to the reinforcement of concrete structures , carbon fiber composite materials , light weight ( 300 g / m 2 ) , high tensile strength (2300MPa-4450MPa), resistant to corrosion , construction simple , etc. , has been widely used in recent years, structural reinforcement works . Domestic and international studies have shown that : CFRP strengthening reinforced concrete flexural members can significantly improve the bearing capacity and stiffness , reducing deflection . Seismic reinforcement member has good ductility . However, due to the way Slab by force and failure mode particularity study of two-way slabs strengthened with CFRP less, especially for load CFRP reinforcement way Slab . This article on the basis of existing experimental research , in-depth analysis and research , the main contents are as follows : (1) combined with the existing experimental phenomena and theoretical analysis , for load CFRP reinforced concrete two-way slabs under concentrated loads simply supported reinforced bi - directional board, consider the load bearing capacity under different reinforcement formula is derived . (2) combined with theoretical formula , various factors such as the size of the load , the reinforcement ratio , concrete strength, reinforcement of load bearing capacity of two-way slabs strengthened with CFRP were analyzed . The analysis showed that : CFRP reinforcement of the bearing capacity of reinforced concrete two-way slabs significantly increased ; load bearing capacity is very small and can be ignored . (3) the effectiveness of short-term stiffness of the CFRP strengthened two-way slabs formula and verify that the formula is derived using the formula to calculate the deflection of the plate under different load levels . The results show that : the load level of stiffness influence can not be ignored . (4) using the finite element software ANSYS way slabs strengthened with CFRP whole process of numerical simulation , and the simulation results with the theoretical results were compared , results showed that : a ) the use of linear plastic hinge line model simplification is realistic ; b ) bearing capacity calculations and finite element analysis results are in good agreement ; c ) deflection analysis results with the calculated results have a certain bias , but in line with changes in the law . The simulation results further demonstrate the effectiveness of the theoretical derivation and calculation results .

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