Study on Mechanical Properties of Corroded Reinforced Concrete Frame Columns Under Cyclic Load
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摘要: 采用有限元软件ABAQUS，以锈蚀率（0%、5%、10%、15%和20%）为变量，对5根钢筋混凝土柱的力学性能进行了数值模拟，研究各试件的滞回性能、骨架曲线、延性及耗能能力，分析钢筋锈蚀率对承载力、延性、耗能和塑性铰转动能力的影响。研究结果表明：模拟分析得到的锈蚀钢筋混凝土柱的强度和变形与试验结果吻合较好，建立的有限元模型可用于锈蚀钢筋混凝土柱的力学性能分析；混凝土开裂前，锈蚀构件的力学性能基本与未锈蚀构件相同，混凝土开裂后，构件的承载力、屈服荷载、极限位移、延性等均随钢筋锈蚀率的增大而降低；轻度锈蚀构件的滞回性能和破坏形式与未锈蚀构件类似，随着钢筋锈蚀率逐渐增大，滞回环的饱满程度降低，“捏拢”现象严重，滞回曲线由“弓形”逐渐发展成“反S形”，耗能能力降低，破坏形式趋于脆性破坏，位移延性系数、平均耗能系数等指标逐渐下降。Abstract: The numerical simulation of the mechanical properties of five corroded reinforced concrete columns with different degree of corrosion was presented with the finite element software ABAQUS. Hysteretic behavior, skeleton curve, ductility and energy dissipation capacity of specimens was studied. The influence of corrosion amount on bearing capacity, ductility, energy dissipation capacity and plastic hinge rotation capability were analyzed. Our results show that the strength and deformation of the specimens obtained by simulation are in good agreement with the test results. The numerical model established in this paper can be used for the mechanical properties analysis of corroded reinforced concrete columns. Before the cracking of concrete, the corrosion of steel bars has no obviously effect on the mechanical properties of concrete bending members. After the cracking of concrete, bearing capacity, yield load, ultimate displacement and ductility of specimens decrease with the increase of the corrosion rate. The hysteresis behavior and the failure mode of mildly corroded specimens are similar to those of non-corroded specimens. As the increase of corrosion amount, the hysteresis loop gradually deflates, and its pinch phenomenon is more serious. The shape of hysteresis curve gradually develops from bow-shaped to anti-S-shaped. The failure mode of specimens tend to be brittle failure. The displacement ductility factor, coefficient of average energy dissipation and other indicators decrease too.
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Key words:
- Corrosion /
- Reinforced concrete column /
- Mechanical properties /
- Numerical simulation
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图 3 试验柱几何参数及截面配筋示意图
Figure 3. The geometric parameters and sectional reinforcement diagram of test columns
图 4 锈蚀钢筋混凝土柱有限元分析模型
Figure 4. Finite element analysis model of corroded reinforced concrete column
图 6 框架柱在循环荷载作用下的最终变形
Figure 6. Final deformation of frame columns under cyclic loading
图 7 不同锈蚀率框架柱的滞回曲线
Figure 7. Hysteretic curves of frame columns with different corrosion rates
图 8 不同锈蚀率框架柱的骨架曲线
Figure 8. Skeleton curves of frame columns with different corrosion rates
图 9 位移延性系数与锈蚀率关系曲线
Figure 9. Relation between displacement ductility coefficient and corrosion rate
图 10 极限弹塑性位移角与锈蚀率关系曲线
Figure 10. Relation between ultimate elastoplastic displacement angle and corrosion rate
图 11 平均耗能系数与锈蚀率关系曲线
Figure 11. Relation between average energy dissipation coefficient and corrosion rate
图 12 塑性铰转动能力与锈蚀率关系曲线
Figure 12. Relation between plastic hinge rotation capacity and corrosion rate
表 1 CDP模型塑性参数取值
Table 1. The plastic parameters of the CDP model
参数 Ψ/° φ fb0/fc0 Kc μ ωt ωc 数值 33 0.1 1.16 0.667 0.001 0 0.3 
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表 2 承载力、变形参数试验值与模拟值对比
Table 2. Comparison of bearing capacity and deformation parameters between numerical simulation and physical test
开裂荷载/kN 屈服荷载/kN 极限荷载/kN 延性比 侧移角/rad 试验实测 20.00 41.78 50.15 4.46 0.038 有限元计算 20.47 43.41 53.85 4.75 0.041 相对误差/% 2.35 3.90 7.38 6.56 7.89
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表 3 滞回环能量试验值与模拟值对比
Table 3. Comparison of hysteresis loop energy between numerical simulation and physical test
循环次数 试验值/kN·mm 模拟值/kN·mm 相对误差/% 1st 201.45 178.19 -11.54 2nd 590.07 463.68 -21.42 3rd 730.58 710.88 -2.69 4th 828.98 951.38 14.76 5th 1187.56 1270.92 7.02 6th 1929.19 1936.33 0.37 7th 2258.10 2332.90 3.31 8th 2825.36 3000.31 6.19
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表 4 锈蚀钢筋计算参数
Table 4. Calculation parameters of corroded steel bars
钢筋截面锈蚀率/% 钢筋直径/mm 屈服强度/Mpa 极限塑性变形率/% 粘结强度降低系数 0 14.00 415.60 10.44 1 5 13.64 410.55 9.80 0.664 10 13.28 404.93 9.16 0.369 15 12.91 398.66 8.52 0.206 20 12.52 391.60 7.87 0.115
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