Dynamic Analysis On Composite Reinforced Concrete Block Shear Wall With Core Column-constructional Column

Based on summarizing considerable relational reference and finite element theory abroad and domestic, Finite element model about the core column-constructional column of composite reinforced block shear wall with large general-purpose software ANSYS has been created, Including the selection of finite element, reinforced concrete block masonry and constitutive relation chosen, the determination of failure criteria. Through comparative analysis with the test model, the calculated results were in good agreement with the experimental results that proved the reliability of finite element analysis model.Based on the analysis of test model about composite reinforced block shear wall with core column-constructional column, Carried out the magnification parameter analysis, Taken into consideration of different parameters such as the different reinforcement ratio, axial compression ratio and different intensity levels, studied on the influence law of seismic performance about composite reinforced block shear wall with core column-constructional column on effect of these parameters, mainly included the effect of composite reinforced block shear wall such as the vibration mode, period, harmonic response, hysteresis characteristics, skeleton curve and the ductility.Every period of composite reinforced block shear wall with core column- constructional column was longer than the ordinary shear wall, which the lateral stiffness of the composite reinforced block shear wall with core column-constructional column was smaller than the ordinary shear wall, this is beneficial to earthquake.Mainly analyzed the first six meaningful order modes of hollow bearing wall, took the first 20 frequencies and cycle in order to analyze the harmonic response, Harmonic response mainly analyzed the displacement-time history curves under the X-axis direction of load.Finite element analysis results show that under the conditions of reinforcement rate and stress, with the block strength class by the MU15 into MU20, the elastic stage of P-Δcurve increased to some extent, But it was not clear, curve slope was larger, the area of hysteresis loop increased show that the enhancement of seismic energy dissipation capacity, ultimate load increased by 21%, wall ductility ratio increased by 9.47%; Under the conditions of intensity level and reinforcement ratio, with the vertical pressure by the 0.9MPa into 1.4MPa, the elastic stage of curve significantly grew, curve slope was larger, ultimate load increased by 30%, wall ductility ratio increased by 10.8%; Under the conditions of intensity level and vertical stress,with no horizontal reinforcement, the elastic stage of P-Δcurve was almost unchanged, but the curve slope was smaller, ultimate load decreased by 15.9%, wall ductility ratio increased by 13.7%. This shows that not only can improve the shear bearing capacity with additional level of reinforcement in grouted joint, but also can furtherly improve the ductility. This is due to restrictions on the sudden through of the main cracks in horizontal reinforced bar, when the horizontal reinforced bar yield, furthermore increased the displacement, constraint on the structural column was fully played.