摘要:
为进一步改善高性能混凝土剪力墙的抗震性能,在6个带端柱高性能混凝土剪力墙试件中采用分段约束、相互嵌套的配箍方案;试件的剪跨比为1.0～2.1,轴压比为0.28～0.40,混凝土立方体抗压强度在89～99 MPa之间,横向约束箍筋采用极限强度为742 MPa的高强钢丝。对这6个试件进行了拟静力试验,观察了各试件的裂缝开展过程和破坏形态,分析了其滞回性能、承载能力、变形能力、刚度衰减和截面应变等。实测位移延性系数在3.75～5.20,耗能系数在0.76～1.13,表明采用横向分段约束嵌套的配箍方案有效地提高了带端柱高性能混凝土剪力墙的延性、变形和耗能能力等。根据试验结果,分别以侧移角和塑性铰转角作为性能指标,并给出了四个性能水平的性能指标限值。
Abstract:
To improve the seismic behavior of high performance concrete shear wall(HPCW),a new stirrup arrangement of independent closed reinforcement hoops nested with each other in six HPCWs with edge columns was developed,and verified by the pseudo-static test.Aspect ratios of walls are 1～2,and axial load ratios 0.28 ～0.40.The cubic compressive strength of concrete is 89～99 MPa for different specimens.The ultimate strength of stirrup is 737.5 MPa.Development of cracks and failure modes of specimens were compared.Hysteretic characteristics,load-bearings,deformation-ability,and rigid attenuation,strain of reinforcement were analyzed.The displacement ductile ratios measured were 3.75～5.20,the coefficients of energy dissipation were 0.76～1.31.Results showed that the new stirrup arrangement effectively improved the seismic behavior of the HPSW with edge columns such as ductility,deformability,energy dissipation capacity etc.Based on results,allowable values of drift angle and rotation of plastic hinge for four performance levels of shear wall components were presented.
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