西安建筑科技大学学报(自然科学版)

针对一种带钢套靴的自复位RC框架柱脚,在分析其受力机理的基础上,采用有限元模型对不同轴压比下柱脚的抗震性能进行了模拟分析,并与试验结果对比分析,结果表明:模拟分析和试验所得的滞回曲线在各加或卸载段、峰值特征点和柱脚开口情况均吻合较好,验证了本文有限元模型的有效性.最后通过参数分析,对比研究了不同初始预应力筋面积、预应力筋初始应力、耗能元件面积、轴压比对自复位柱脚抗震性能的影响规律,为该节点的抗震设计提供参考.

Point at a kind of self-centering RC column base joints with steel shoes, based on the structure and mechanics performance of the joints, seismic behavior of the column base joints under different axial compression ratio was simulated and analyzed by finite element method, and compared with the test results. The results indicated that in the aspects of hysteretic curve, peak value point at each level and opening situation of column base, analysis results were consistent with experimental results which proved the validity of the finite element model. Finally, seismic behavior of self-centering RC column base joints under different area of prestressed bar, initial stress of prestressed bar, area of energy dissipative element, axial compression ratio was researched by parameter analysis, which also provided reference for seismic design of the joints.

引言
1 自复位RC框架柱脚的构造及理论分析
2 自复位RC框架柱脚节点模拟分析
3 模拟与试验结果对比分析
4 不同参数对自复位柱脚抗震性能影响对比分析
5 结论

图1 自复位RC框架柱脚结构示意<br/>Fig.1 Self-centering RC frame column base joints

图1 自复位RC框架柱脚结构示意
Fig.1 Self-centering RC frame column base joints

图2 自复位RC框架柱脚的水平荷载 - 位移曲线<br/>Fig.2 Horizontal load-displacement curves of self-centering RC column base joints

图2 自复位RC框架柱脚的水平荷载 - 位移曲线
Fig.2 Horizontal load-displacement curves of self-centering RC column base joints

图3 自复位RC框架柱脚节点有限元模型<br/>Fig.3 The finite element model of SCFC

图3 自复位RC框架柱脚节点有限元模型
Fig.3 The finite element model of SCFC

图4 混凝土的应力 - 应变滞回关系<br/>Fig.4 Hysteretic stress-strain relation of concrete

图4 混凝土的应力 - 应变滞回关系
Fig.4 Hysteretic stress-strain relation of concrete

图5 钢筋的应力 - 应变关系<br/>Fig.5 Stress-strain relation of steel

图5 钢筋的应力 - 应变关系
Fig.5 Stress-strain relation of steel

图6 试验装置示意图<br/>Fig.6 Test device diagram

图6 试验装置示意图
Fig.6 Test device diagram

图7 荷载 - 位移曲线对比分析<br/>Fig.7 The comparison of load-displacement curves

图7 荷载 - 位移曲线对比分析
Fig.7 The comparison of load-displacement curves

表1 试件SCFC1-0.1模拟值与试验值FC的对比<br/>Tab.1 Comparison of simulation and test result, FC,for Specimen SCFC1-0.1

表1 试件SCFC1-0.1模拟值与试验值FC的对比
Tab.1 Comparison of simulation and test result, FC,for Specimen SCFC1-0.1

表2 试件SCFC1-0.3模拟值与试验值FC的对比<br/>Tab.2 Comparison of simulation and test result, FC,for Specimen SCFC1-0.3

表2 试件SCFC1-0.3模拟值与试验值FC的对比
Tab.2 Comparison of simulation and test result, FC,for Specimen SCFC1-0.3

图8 试件耗能钢筋伸缩位移 - 加载步曲线对比分析<br/>Fig.8 The comparison of energy dissipation bars displacement versus loading-steps curves

图8 试件耗能钢筋伸缩位移 - 加载步曲线对比分析
Fig.8 The comparison of energy dissipation bars displacement versus loading-steps curves

图9 预应力筋应力对比分析<br/>Fig.9 The comparison of prestressed tendon stress

图9 预应力筋应力对比分析
Fig.9 The comparison of prestressed tendon stress

表3 模拟算例编号<br/>Tab.3 Specimens number of numerical simulation

表3 模拟算例编号
Tab.3 Specimens number of numerical simulation

图10 不同参数下的荷载 - 位移关系<br/>Fig.10 Load-displacement curves with different parameters

图10 不同参数下的荷载 - 位移关系
Fig.10 Load-displacement curves with different parameters

表4 模拟算例编号<br/>Tab.4 Specimens number of numerical simulation

表4 模拟算例编号
Tab.4 Specimens number of numerical simulation

图11 不同轴压比下的荷载 - 位移关系<br/>Fig.11 Load-displacement curves with different axial compression ratio

图11 不同轴压比下的荷载 - 位移关系
Fig.11 Load-displacement curves with different axial compression ratio

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备注

引言

1 自复位RC框架柱脚的构造及理论分析

2 自复位RC框架柱脚节点模拟分析

3 模拟与试验结果对比分析

4 不同参数对自复位柱脚抗震性能影响对比分析

5 结论

期刊信息