Seismic Performance of Concrete Composite Columns of Ultra-High Performance Concrete Precast Pipe
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摘要:
为研究在低周反复荷载下超高性能混凝土（UHPC）预制管混凝土组合柱的抗震性能，进行共计3根UHPC预制管混凝土组合柱和1根钢筋混凝土柱的拟静力试验，分析在不同UHPC强度和核心混凝土有无配筋情况下，各组合柱试件的破坏模式、位移延性、耗能能力、刚度退化等方面抗震性能. 分析结果表明：UHPC预制管混凝土组合柱试件的滞回曲线较为饱满，破坏形态基本相同，均为整体压弯破坏；与传统钢筋混凝土（RC）柱相比，UHPC预制管混凝土组合柱刚度、屈服荷载、延性性能均有提升；随着UHPC强度增大，组合柱试件的滞回曲线更为饱满，耗能能力增强，残余位移小，水平峰值荷载和位移延性系数分别提高了20.60%和6.40%，表现出良好的整体抗震性能；采用ABAQUS程序建立组合柱的有限元分析模型，计算结果与试验结果吻合良好；轴压比、长细比、UHPC强度是影响UHPC预制管混凝土组合柱抗震性能的重要参数，可为同类工程设计提供参考.
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关键词:
- 超高性能混凝土（UHPC） /
- 组合柱 /
- 抗震性能 /
- 拟静力试验 /
- 有限元分析
Abstract:To investigate the seismic performance of concrete composite columns of ultra-high performance concrete (UHPC) precast pipe under low-cycle repeated loads, three concrete composite columns of UHPC precast pipes and one reinforced concrete (RC) column were subjected to quasi-static tests, so as to analyze the seismic performance of each composite column specimen in terms of damage mode, displacement ductility, energy dissipation capacity, and stiffness degradation under different UHPC strengths and core concrete with or without reinforcement. The analysis results show that the hysteresis curves of the concrete composite column specimens of UHPC precast pipe are fuller, and their damage patterns are basically the same, which are both integral compression-bending damage. Compared with those of the conventional RC columns, the stiffness, yield load, and ductility of the concrete composite column of UHPC precast pipe are improved. With the increase in UHPC strength, the hysteresis curves of the composite column specimens are fuller, and the energy dissipation capacity is enhanced. The residual displacement is small, and the horizontal peak load and displacement ductility coefficient increase by 20.6% and 6.4%, which shows good overall seismic performance. The finite element analysis model of the composite column is established by the ABAQUS program, and the calculation results are in good agreement with the test results. Different axial compression ratios, slenderness ratios, and UHPC strengths are important parameters affecting the seismic performance of concrete composite columns of UHPC precast pipes, which can provide a reference for similar engineering designs.
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图 11 不同轴压比下各试件骨架曲线
Figure 11. Skeleton curves of specimens under different axial compression ratios
图 12 不同长细比下各试件骨架曲线
Figure 12. Skeleton curves of specimens under different slenderness ratios
图 13 各UHPC强度下试件骨架曲线
Figure 13. Skeleton curves of specimens under different UHPC strengths
图 14 不同核心混凝土强度下试件骨架曲线
Figure 14. Skeleton curves of specimens under different core concrete strengths
图 15 不同UHPC预制管内箍筋间距下试件骨架曲线
Figure 15. Skeleton curves of specimens under different spacing of stirrups in UHPC precast pipe
表 1 试件编号与参数
Table 1. Numbers and parameters of specimens
试件编号 h/mm d/mm fu/MPa 有无配筋 URS100 900 300 100 有 URS140 140 有 UNS140 140 无 Z1 
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表 2 混凝土材料性能表
Table 2. Concrete material properties
MPa 材料 弹性模量 抗压强度 C40 3.34 × 104 41.9 UHPC100 4.01 × 104 101.6 UHPC140 4.35 × 104 140.5
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表 3 钢筋材料性能表
Table 3. Reinforcement material properties
MPa 材料 弹性模量 屈服强度 极限强度 箍筋 2.06 × 105 415.6 554.5 纵筋 1.98 × 105 452.2 613.2
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表 4 试验与数值模拟骨架曲线特征值对比
Table 4. Comparison of skeleton curve eigenvalues of experimental and numerical simulation results
试件编号 弹性刚度/（kN·mm−1） 屈服荷载/kN 水平峰值荷载/kN 峰值荷载位移/mm 试验值 模拟值 误差/% 试验值 模拟值 误差/% 试验值 模拟值 误差/% 试验值 模拟值 误差/% Z1 5.9 6.1 −3.8 73.6 70.4 4.30 87.3 82.4 5.0 32.00 30.04 6.1 URS140 14.5 15.5 −6.9 134.8 134.6 0.14 158.1 157.4 0.4 18.03 17.56 2.6 URS100 12.7 12.4 2.4 109.2 109.6 −0.30 128.3 123.5 3.7 22.10 20.60 6.7 UNS140 15.9 15.4 3.1 107.6 106.8 0.70 131.3 129.8 1.1 18.10 17.60 2.7
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表 5 试件位移延性系数
Table 5. Displacement ductility coefficient of specimens
试件编号 Z1 URS140 URS100 UNS140 位移延性系数 5.12 4.63 4.58 4.05
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表 6 刚度退化特征值表
Table 6. Stiffness degradation eigenvalue
试件 起始刚度/
（kN·mm−1）最终刚度/
（kN·mm−1）刚度退化率/% URS140 30.52 2.04 93 UNS140 27.83 1.69 94 URS100 26.55 1.94 92 Z1 17.96 1.21 93
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