Experimental study on seismic behavior and corresponding size effect of reinforced concrete shear walls
In order to reveal the influence and mechanism of structure size on seismic performance of reinforced concrete(RC)shear walls,six RC shear walls of different sizes with the maximum length of 1.8 m and the shear span ratio of 1.17 were designed.The seismic performance of shear walls under constant axial load and cyclic horizontal loading was studied.The effects of the structure size and the horizontal reinforcement ratios(0.25％and 0.5％)on the seismic performance of RC shear walls were analyzed,including failure modes,hysteretic properties,deformation capacity,energy dissipation and stiffness degradation.The test results show that the six shear walls with horizontal reinforcement ratios of 0.25％and 0.5％fail in brittle shear and compression-shear,respectively,and with the increase of specimen size(the length of shear wall increases from 600 mm to 1 800 mm),the deformation capacity and energy dissipation capacity decrease obviously.When the length of shear wall increases from 600 mm to 1 800 mm,the ductility coefficient decreases by 38％,the softening rate increases by 142％,and the energy dissipation coefficient decreases by 38％;the nominal cracking,yield and shear strength of the shear wall decrease significantly with the increase of the length.When the length of shear wall with horizontal reinforcement ratios of 0.25％and 0.5％increased from 600 mm to 1 800 mm,the nominal cracking,yield and shear strength decrease by 57％and 64％,18％and 26％,19％and 24％,respectively,indicating that the size effect is significant;with the increase of horizontal reinforcement ratio(increases from 0.25％to 0.5％),the shear capacity,deformation capacity,nominal cracking,yield and shear strength of the shear wall are all enhanced,but the size effect is suppressed obviously.In addition,the experimental results confirm the accuracy and rationality of size effect law proposed in previous study of our lab,which can be used to calculate the nominal shear strength of RC shear walls.
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维普
