| This paper adopts the separated modeling method to make a finite element simulation analysis on the seismic performance of compressionbending member(shear walls, columns) through ANSYS software. Comparisons between finite element results and theoretical results as well as the experimental results are discussed in the paper. Meanwhile, the theoretical model and the calculation formula of RC shear wall strengthened with HPFL are established.ANSYS software is used to make a finite element simulation analysis on seismic performance of five strengthened shear wall members with different arrangements of steel mesh. Indicators of the strengthened members, such as hysteretic characteristics, skeleton curve, ductility, bearing capacity, stiffness and strength change laws, energy dissipation capacity, and strain capacity etc., are measured to show the HPFL anti-seismic effect after the strengthening. The finite element simulation results indicate that the bearing capacity, ductility, stiffness, and energy dissipation capacity of strengthened shear walls have been improved in various degrees, comparing with those of unstrengthened sheer walls. Among these strengthening methods, when the strengthening method to encrypt the lower half part of sheer wall is adopted, the improvement of ductility is the most obvious; when the comprehensive strengthening method is adopted, the improvement of stiffness is the most obvious; when the strengthening method to strengthen the restrained edge member of shear walls is adopted, the improvement of yield resisting capacity is the most obvious. Besides, the strength degradation of strengthened shear walls slows down obviously with the strain capacity of steel bars under the same displacement loading decreasing, which indicates significant strengthening effect of HPFL. Further, a mechanical analysis on the bearing capacity of normal sections of HPFL strengthened sheer walls is carried out with the calculation formula of bearing capacity of large or small eccentricity of normal section of strengthened shear wall under one load and secondary load being established. After comparing the finite element simulation values with the calculated values of established theoretical formulas, it turns out that the conformance is quite high, which verifies the reliance of established theoretical formulas.In consideration of different axial compression ratios, different shapes of members and different strengthening methods with components under one load and secondary load condition, analyses on the seismic performance of HPFL strengthened concrete columns are carried out through ANSYS software. The analysis results show that the bearing capacity and ductility of strengthened members have been improved in various degrees while strength and stiffness degradation rate reduced to a certain extent, which indicates that the strengthening effect is obvious with the reinforcing effect of secondary load less obvious than that of one load. In addition, the situation of longitudinal bar anchored into the base is compared with that of longitudinal bar unanchored into the base in the paper. It has been found that reinforcing effect of longitudinal bar anchored into the base is obviously better than that of longitudinal bar unanchored into the base, especially for secondary load components, the former is more applicable to practical engineering. The high conformance and consistence of the finite element simulation results of HPFL strengthened concrete columns with test results verify the correctness and reasonability of failure criterion, constitutive relation and parameter setting etc. adopted in finite element simulation, which indicates the feasibility and reliability of finite element simulation analysis and provides references for further study on mechanical properties of HPFL strengthened concrete columns. |
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