Experimental Study on Axial Compressive Mechanical Performance of Concrete-Filled Short Double-Skin Composite Tubular Columns with Inner Corrugated Steel Pipe
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摘要:
为改善传统中空夹层钢管混凝土柱内钢管易过早向内屈曲，对混凝土约束能力不足的问题，提出一种新型中空波纹夹层钢管混凝土柱，并以空心率、名义含钢率、波纹钢管壁厚和内管形式为主要参数，对8个中空波纹夹层钢管混凝土短柱试件开展系统的轴压性能试验研究，并基于试验结果建立有限元模型，对构件在轴向荷载作用下的受力机理、约束效应及关键构造参数的影响规律进行深入探讨. 研究结果表明：中空波纹夹层钢管混凝土柱在轴压作用下均表现出良好的延性，破坏模式以外钢管局部鼓曲为主，波纹钢管未发生明显失稳；随着空心率的增大，构件承载力显著降低；名义含钢率对构件承载力影响显著，而波纹钢管壁厚对极限承载力影响较小，与传统中空夹层钢管混凝土柱相比，新型构件的峰值承载力略有降低，但初始刚度和延性明显提高；所有试件强度指数均大于1.00，最大可达1.33，表明波纹钢管与混凝土之间形成了更为有效的组合效应；有限元计算结果进一步揭示了波纹钢管主要通过波谷区域对夹层混凝土提供较强侧向约束，而螺旋角对构件轴压性能影响较小，波形参数对承载力具有一定影响. 研究成果可为中空波纹夹层钢管混凝土柱的工程应用与设计提供参考.
Abstract:To address the problems of premature inward buckling of the inner steel pipe and insufficient confinement to concrete in traditional concrete-filled double-skin composite tubular columns, a novel concrete-filled double-skin composite tubular column with an inner corrugated steel pipe was proposed. By taking the hollow ratio, nominal steel ratio, wall thickness of the corrugated steel pipe, and inner tube configuration as the main parameters, a systematic experimental study on the axial compressive performance of eight concrete-filled short double-skin composite tubular column specimens with inner corrugated steel pipe was conducted. Based on the experimental results, a finite element model was established to further discuss the load-bearing mechanism, confinement effect, and influence rules of key structural parameters of the components under axial loads. The results indicate that all concrete-filled double-skin composite tubular columns with inner corrugated steel pipe exhibit good ductility under axial compression. The failure mode is dominated by local outward buckling of the outer steel pipe, while no obvious instability occurs in the corrugated steel pipe. With an increase in the hollow ratio, the bearing capacity of the components decreases significantly; the nominal steel ratio has a pronounced effect on the bearing capacity, whereas the wall thickness of the corrugated steel pipe has a minor effect on the ultimate bearing capacity. Compared with traditional concrete-filled double-skin composite tubular columns, the peak bearing capacity of the novel components decreases slightly, but the initial stiffness and ductility improve significantly. The strength indices of all specimens are greater than 1.00, reaching a maximum of 1.33, which indicates that a more effective composite effect is formed between the corrugated steel pipe and the concrete. The finite element calculation results further reveal that the corrugated steel pipe provides strong lateral confinement to the sandwiched concrete mainly through the trough regions, while the helical angle has a minor effect on the axial compressive performance, and the waveform parameters have a certain effect on the bearing capacity. The research results provide a reference for the engineering application and design of concrete-filled double-skin composite tubular columns with an inner corrugated steel pipe.
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图 1 中空波纹夹层钢管混凝土柱
Figure 1. Concrete-filled double-skin composite tubular column with inner corrugated steel pipe
图 14 有限元分析结果和试验结果对比
Figure 14. Comparison between finite element analysis results and experimental results
图 15 典型构件荷载-变形全过程曲线
Figure 15. Full-process load–deformation curves of typical components
图 16 跨中截面混凝土纵向应力分布等值线
Figure 16. Contours of longitudinal stress distribution of concrete in mid-span section
图 17 相互作用力P1和P2随轴向应变变化曲线
Figure 17. Variation curves of interaction forces P1 and P2 with axial strain
图 18 波纹钢管螺旋角对构件承载力的影响
Figure 18. Effect of helical angle of corrugated steel pipe on bearing capacity of components
表 1 中空波纹夹层钢管混凝土短柱试件参数表
Table 1. Parameters of concrete-filled short double-skin composite tubular column specimens with inner corrugated steel pipe
mm 序号 $ {D}_{\text{o}} $ $ {t}_{\text{o}} $ $ {D}_{\text{in}} $ $ {t}_{\text{csp}} $ $ \chi $ $ {\alpha }_{\text{n}} $ L 变量 L/Do DSCTC-1a 406 10 200 1.6 0.52 0.10 1203 基准试件 3 DSCTC-1b 406 10 200 1.6 0.52 0.10 1203 DSCTC-2 299 8 200 1.6 0.70 0.11 900 空心率 DSCTC-3 457 10 200 1.6 0.45 0.09 1371 空心率 DSCTC-4 406 7.5 200 1.6 0.51 0.08 1203 名义含钢率 DSCTC-5 406 12 200 1.6 0.52 0.13 1203 名义含钢率 DSCTC-6 406 10 200 1.4 0.52 0.10 1203 内管径厚比 DSCT 406 10 200 3.0 0.52 / 1203 内层圆钢管 注：DSCTC 表示中空波纹夹层钢管混凝土柱，DSCT 表示中空夹层钢管混凝土柱. 
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表 2 钢材主要力学性能指标
Table 2. Main mechanical performance indicators of steel
规格 tok/mm fyok/MPa fuk/MPa Esk/GPa $ \phi $406×10 10.07 273 445 202 $ \phi $299×8 8.47 288 467 190 $ \phi $457×10 9.95 275 456 197 $ \phi $406×7.5 7.64 317 506 193 $ \phi $406×12 12.72 270 444 198 $ \phi $203×3 3.30 277 433 198 注：ϕ406×10表示钢管直径为406 mm，壁厚为10 mm.
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表 3 波纹钢管力学性能指标
Table 3. Mechanical performance indicators of corrugated steel pipe
厚度/
mm位置 屈服强度/MPa 极限强度/MPa 弹性模量/GPa 1.4 波峰 392 467 196 波中 278 425 202 波谷 392 463 170 1.6 波峰 368 468 134 波中 269 387 168 波谷 353 448 152
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表 4 试件轴压性能指标
Table 4. Axial compressive performance indicators of specimens
试件编号 K
（GN·m−1）Nue/
kN$ {\varepsilon }_{\text{u}} $ Nc/
kNSSI DSCTC-1a 831 6310 0.048 5158 1.22 DSCTC-1b 906 6341 0.045 5158 1.22 DSCTC-2 442 3128 0.039 2869 1.09 DSCTC-3 558 7839 0.022 6271 1.25 DSCTC-4 781 5998 0.011 4837 1.24 DSCTC-5 793 7870 0.033 5917 1.33 DSCTC-6 577 6576 0.036 5158 1.27 DSCT 604 6966 0.018 5709 1.22
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