SEISMIC CHARACTERISTICS OF HYBRID FRP-STEEL-REINFORCED CONCRETEL SHEAR WALLS SUBJECTED TO CYCLIC LOADS
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摘要: 剪力墙是高层和超高层建筑物的主要抗侧力构件,对建筑结构的抗震性能至关重要。采用ABAQUS有限元分析软件对7个轴压比分别为0.2、0.3和0.4的纤维增强复材(FRP)筋-钢筋混凝土剪力墙进行反复荷载作用下的拟静力分析,研究轴压比和FRP筋力学性能对剪力墙的滞回性能、骨架曲线、抗震性能和残余变形等的影响,对剪力墙的损伤分布特征进行了对比分析。结果表明:剪力墙边缘构件配置FRP纵筋能够有效控制混凝土剪力墙的残余变形,改善剪力墙的延性,促进筋材与混凝土的共同工作,采用的FRP筋强度和弹性模量越高,效果越明显,但墙体的耗能能力有所降低;随着轴压比的增加,配有FRP筋的剪力墙的极限承载力逐渐增大,极限承载力对应的位移减小,墙体延性降低,墙体残余变形逐渐增大,且当轴压比小于0.3时,轴压比对墙体残余变形的不利影响较小,轴压比大于0.3时,轴压比对墙体残余变形的不利影响急剧增加。Abstract: Shear walls are main lateral resistance members of high-rise and super-high-rise buildings, which are very important to the seismic performances of building structures. The pseudo-static analysis of seven hybrid FRP-steel-reinforced concrete shear walls with axial compression ratios of 0.2, 0.3 and 0.4 were simulated by finite element analysis software ABAQUS. The effects of axial compression ratios and mechanical properties of FRP bars on hysteretic properties, skeleton curves, seismic characteristics and residual deformation of shear walls were studied. The damage development characteristics of shear walls were compared and analyzed. The results showed that the longitudinal reinforcement in the edge members of RC shear walls with FRP bars could effectively decrease the residual deformation of shear walls, improve the ductility of the shear wall, and promote the joint work of reinforcement bars and concrete. The higher the strength or elastic modulus of FRP bars was, the more obvious the effect was, but the lower the energy consumption capacity of walls ware. With the increase of the axial compression, the ultimate bearing capacity of shear walls with FRP bars gradually increased, and the ultimate lateral displacement gradually increased when the axial compression ratios were less than 0.3, the adverse effect of the axial compression ratio on residual deformation of walls were small, and when axial compression ratios were greater than 0.3, the adverse effect of the axial compression ratio on residual deformation of walls increased sharply.
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Key words:
- shear wall /
- FRP bar /
- self-centering /
- residual deformation /
- axial compression ratio /
- skeleton curve /
- damage
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