论文部分内容阅读
为了研究冻融循环作用、混凝土强度和轴压比对一字形短肢剪力墙抗震性能的影响,探讨冻融环境下一字形短肢剪力墙的轴压比限值,设计制作了6个剪跨比为1.14的一字形短肢剪力墙试件并对其进行了200次循环的人工气候冻融试验,进而进行拟静力试验。基于试验描述了各试件的破坏过程与特征,并以抗剪承载力、延性系数、塑性转角、强度衰减、刚度退化和累积滞回耗能等指标为参数,分析了冻融环境下一字形短肢剪力墙抗震性能的衰减规律。试验结果表明:冻融循环作用对一字形短肢剪力墙的抗剪承载力、强度衰减、刚度退化和耗能能力影响较为显著,而对其变形能力影响较小;冻融循环次数不变,增大混凝土强度可有效增强一字形短肢剪力墙构件的抗冻性能,提高其抗震能力;冻融环境下,应严格控制一字形短肢剪力墙构件的轴压比。
In order to study the effect of freeze-thaw cycles, concrete strength and axial compression ratio on the seismic performance of short-limb shear wall, the axial compression ratio of short-pier shear wall in freezing-thawing environment was discussed. Six Shear span ratio of 1.14 in-line short-piercing shear wall specimens and its 200 cycles of artificial climate freeze-thaw test, and then pseudo-static test. Based on the experiments, the failure process and characteristics of each specimen were described. The parameters of shear strength, ductility coefficient, plastic rotation angle, strength attenuation, stiffness degradation and cumulative hysteresis energy consumption were taken as parameters to analyze the deformation The attenuation law of seismic behavior of short - limbed shear wall. The experimental results show that the freeze-thaw cycle has a significant effect on the shear strength, strength attenuation, stiffness degradation and energy dissipation capacity of the short-limb shear wall, but has little effect on the deformation capacity; the number of freeze-thaw cycles remains unchanged , And increasing the strength of concrete can effectively enhance the frost resistance of the short-limb shear wall members and improve their anti-seismic capacity. Under the environment of freezing and thawing, the axial compression ratio of the short-limb shear wall members should be strictly controlled.