Effects of strengthening methods in plastic hinge zone on seismic performance of high-strength concrete shear walls
To investigate the effects of plastic hinge zone reinforcement methods on the seismic performance of high-strength concrete shear walls,firstly,four high-strength concrete shear walls with high-strength reinforcements were designed to carry out low-cycle loading tests and ABAQUS finite element analysis.Secondly,the effects of three reinforcement methods with adding steel fibers,adding stirrups,and wrapping steel plates on the failure modes,hysteretic behavior,load-bearing and deformation capacity,strength and stiffness degradation,deformability,energy dissipation capacity,and the development length of plastic hinge zone for shear walls were evaluated.Finally,the equivalent plastic hinge length calculation method and bearing capacity calculation method applicable to high-strength concrete shear walls with high-strength reinforcements were proposed.The results show that the three strengthening forms effectively reduce the degree of wall damage,diminish the proportion of shear deformation,and improve the wall's deformation and energy consumption capability.When the heights of the strengthening sections in the three methods are equal,the addition of steel fibers is the most effective in improving the damage pattern of the wall.A fitting thickness of steel plate at the wall base can make the plastic hinge zone fully develop and form the double plastic hinges,significantly enhance the peak load by 17.7%,and the ultimate drift ratio by 75.0%.Based on the simplified curvature distribution and basic assumptions of plastic deformation,considering the balance of force relationship,and the bending and shear deformation coordination relationship,the proposed methods for calculating the equivalent plastic hinge length and horizontal bearing capacity show a high level of precision.
high-strength concretehigh-strength reinforcementsshear wallsseismic performanceplastic hinge
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