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为了提高高强混凝土剪力墙的抗震性能,在其潜在塑性铰区采用纤维增强混凝土代替高强混凝土,设计了4片剪跨比为2.1的剪力墙试件,进行了拟静力试验。通过改变纤维增强混凝土区高度、轴压比、纵筋数量、箍筋配箍特征值和水平分布筋数量,研究这种剪力墙的抗震性能。结果表明:这种剪力墙试件的抗损伤能力明显改善;纤维增强混凝土区高度对其变形能力有明显影响;开裂荷载和开裂位移显著提高。根据试验结果,分析了这种剪力墙试件的开裂位移、屈服位移和极限位移,给出了考虑剪切、弯曲变形影响的开裂位移、屈服位移和极限位移的计算公式,公式的预测值与试验值吻合较好。
In order to improve the seismic performance of high-strength concrete shear walls, four reinforced concrete shear walls with shear-span ratio of 2.1 were designed and their pseudo-static tests were carried out. The seismic performance of this kind of shear wall is studied by changing the height of concrete, the axial compression ratio, the number of longitudinal reinforcement, the characteristic value of hoop and the number of horizontally distributed ribs. The results show that the damage resistance of the shear wall specimens is obviously improved. The height of the fiber reinforced concrete area has a significant effect on the deformation capacity. The cracking load and cracking displacement are significantly increased. According to the test results, the crack initiation displacement, the yield displacement and the ultimate displacement of the shear wall specimens are analyzed. The calculation formulas of the cracking displacement, yield displacement and limit displacement considering the influence of shear and bending deformation are given. The predicted value of the formula Good agreement with the test value.