Compression Performance of Cold-Formed Steel T-Shaped Composite Edge Columns with Web Stiffeners
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摘要:
为研究腹板加劲冷弯薄壁型钢T形拼合边柱的受压性能，对8组试件开展轴压与偏压试验，结合有限元模型验证及参数分析，揭示“V”形纵向加劲肋对构件破坏模式和承载力的影响规律，并提出改进的承载力计算方法. 研究结果表明：轴压作用下未设加劲肋的T形拼合边柱单肢腹板率先出现局部屈曲，最终导致整体压溃破坏；增设“V”形加劲肋后，可以提高单肢C形钢腹板刚度，改善T形拼合边柱的局部屈曲模式，承载力提高约15%；随着偏心距增大，试件破坏模式基本相同，极限承载力呈下降趋势；基于有效宽度法预测轴压和偏压承载力结果均较保守，有限元结果和试验结果均大于计算结果，二者比值的平均值分别为1.238和1.143；修正后的有效宽度法预测结果与模拟值比值在1.000～1.074，预测结果较为准确.
Abstract:To investigate the compression performance of cold-formed thin-walled steel T-shaped composite edge columns with web stiffeners, axial and eccentric compression tests were conducted on eight groups of specimens. The influence of “V”-shaped longitudinal stiffening ribs on the failure modes and bearing capacity of the components were revealed through finite element model validation and parameter analysis, and an improved calculation method for bearing capacity was proposed. The results indicate that under axial compression, local buckling first appears in the web of the T-shaped composite edge column without stiffening ribs, ultimately leading to overall crushing failure. After adding “V”-shaped stiffening ribs, the stiffness of the single-limb C-shaped steel web is enhanced; the local buckling mode of the T-shaped composite edge column is improved, and the bearing capacity increases by approximately 15%. As the eccentricity increases, the failure modes of the specimens remain similar, and the ultimate bearing capacity shows a decreasing trend. The bearing capacities under axial and eccentric compression predicted by the effective width method are conservative. Both the finite element results and the test results are greater than the calculated results, with the average ratios being 1.238 and 1.143, respectively. After modification, the ratio of the results predicted by the effective width method to the simulated values ranges from 1.000 to 1.074, indicating high prediction accuracy.
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图 2 腹板加劲T形CFS边柱拼装示意
Figure 2. Assembly of T-shaped CFS edge column with web stiffeners
图 8 不同长细比试件破坏对比
Figure 8. Comparison of failure of specimens with different slenderness ratios
图 12 不同长细比典型试件破坏模式
Figure 12. Typical failure modes of specimens with different slenderness ratios
图 13 不同长细比试件荷载-轴向位移曲线
Figure 13. Load–axial displacement curves of specimens with different slenderness ratios
图 14 不同偏心距试件破坏模式
Figure 14. Failure modes of specimens with different eccentric distances
图 15 不同偏心距与不同试件荷载-轴向位移曲线
Figure 15. Load–axial displacement curves of specimens with different eccentric distances
图 16 轴压承载力计算值对比
Figure 16. Comparison of calculated bearing capacity values under axial compression
图 17 偏压承载力计算值对比（l=3 300 mm）
Figure 17. Comparison of calculated bearing capacity values under eccentric compression （l=3 300 mm）
表 1 试件编号
Table 1. Specimen number
试件编号 l/mm 受压类型 e/mm TC500−0-2.0 500 轴心受压 0 TCV500−0-2.0 500 轴心受压 0 TC1700−0-2.0 1 700 轴心受压 0 TCV1700−0-2.0 1 700 轴心受压 0 TCV1700−15-2.0 1 700 偏心受压 −15 TCV1700+15-2.0 1 700 偏心受压 +15 TCV1700+30-2.0 1 700 偏心受压 +30 TCV1700+45-2.0 1 700 偏心受压 +45 注：试件编号依次为是否加劲（V表示加劲）、l、e、板件厚度. 
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表 2 试件极限承载力对比
Table 2. Comparison of ultimate bearing capacity of specimens
试件编号 Pcr/kN Pt/kN PA/kN PA/Pt TC500−0-2.0 520.16 525.04 536.29 1.02 TCV500−0-2.0 600.08 607.61 641.90 1.06 TC1700−0-2.0 500.41 515.38 543.29 1.05 TCV1700−0-2.0 580.29 590.71 616.44 1.04 TCV1700−15-2.0 512.06 518.35 527.65 1.02 TCV1700+15-2.0 550.17 561.54 587.87 1.05 TCV1700+30-2.0 450.65 449.23 457.63 1.02 TCV1700+45-2.0 348.38 318.84 325.92 1.02
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表 3 不同长细比试件承载力计算结果对比
Table 3. Comparison of bearing capacity calculation results for specimens with different slenderness ratios
试件编号 λw Nu/kN PDSM/kN Nu1/kN PA/kN PA/Nu PA/PDSM PA/Nu1 TCV900−0-2.0 17.03 536.99 668.59 615.58 622.71 1.159 0.931 1.012 TCV1300−0-2.0 24.28 534.67 661.19 602.44 616.66 1.153 0.933 1.024 TCV1700−0-2.0 31.52 532.70 650.19 596.69 612.90 1.150 0.943 1.027 TCV2100−0-2.0 38.78 528.56 643.35 599.57 612.47 1.158 0.952 1.021 TCV2500−0-2.0 46.02 523.01 633.27 606.92 608.57 1.163 0.961 1.001 TCV2900−0-2.0 53.27 511.64 613.40 594.24 597.51 1.167 0.974 1.006 TCV3300−0-2.0 60.52 489.95 605.34 587.70 595.05 1.214 0.983 1.013 TCV3700−0-2.0 67.76 465.62 582.49 570.92 576.09 1.237 0.989 1.009 TCV4100−0-2.0 75.01 433.45 569.81 545.52 567.53 1.309 0.996 1.040 TCV4500−0-2.0 82.26 389.53 498.90 498.65 510.70 1.311 1.024 1.024 TCV4900−0-2.0 89.51 353.65 451.45 446.59 456.56 1.291 1.011 1.022 TCV5300−0-2.0 96.76 318.75 371.70 388.79 401.92 1.261 1.081 1.034 TCV5700−0-2.0 104.00 287.54 321.82 337.80 345.24 1.201 1.073 1.022 TCV6100−0-2.0 111.25 261.24 312.39 303.82 313.23 1.199 1.003 1.030 TCV6500−0-2.0 118.50 235.65 283.69 292.48 294.31 1.249 1.037 1.001 TCV6900−0-2.0 125.75 215.33 255.89 272.33 280.82 1.304 1.097 1.031 TCV7300−0-2.0 132.00 198.40 239.22 261.56 265.29 1.337 1.109 1.014 TCV7700−0-2.0 140.24 181.55 218.08 256.78 257.92 1.421 1.183 1.004 平均值 1.238 1.021 1.027
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表 4 不同偏心距试件承载力计算结果对比
Table 4. Comparison of bearing capacity calculation results for specimens with different eccentric distances
试件编号 l/mm E/mm N/kN N1/kN Pt/PA/kN PA/N PA/N1 TCV1700-15-2.0 1700 −15 458.72 516.57 518.35 1.129 1.022 TCV1700-0-2.0 1700 0 532.70 596.69 590.71 1.089 1.015 TCV1700 + 15-2.0 1700 + 15 527.76 552.48 561.54 1.064 1.001 TCV1700 + 30-2.0 1700 + 30 407.65 443.87 449.23 1.102 1.028 TCV1700 + 45-2.0 1700 + 45 303.37 316.92 318.84 1.051 1.026 TCV2500-30-2.0 2500 −30 390.41 410.42 419.30 1.074 1.051 TCV2500-15-2.0 2500 −15 446.05 496.05 503.59 1.129 1.000 TCV2500-0-2.0 2500 0 523.01 606.92 608.57 1.164 1.004 TCV2500 + 15-2.0 2500 + 15 459.63 509.63 523.98 1.140 1.013 TCV2500 + 30-2.0 2500 + 30 384.97 414.87 425.39 1.105 1.009 TCV2500 + 45-2.0 2500 + 45 330.89 338.86 356.04 1.076 1.011 TCV3300-30-2.0 3300 −30 356.43 393.33 393.50 1.104 1.018 TCV3300-15-2.0 3300 −15 399.27 470.87 472.74 1.184 1.021 TCV3300-0-2.0 3300 0 489.95 587.70 595.02 1.214 1.041 TCV3300 + 15-2.0 3300 + 15 435.53 502.34 506.96 1.164 1.040 TCV3300 + 30-2.0 3300 + 30 363.75 400.09 404.49 1.112 1.002 TCV3300 + 45-2.0 3300 + 45 310.75 330.62 336.47 1.084 1.017 TCV4100-30-2.0 4100 −30 319.89 363.79 371.39 1.161 1.074 TCV4100-15-2.0 4100 −15 367.71 430.38 447.87 1.219 1.022 TCV4100-0-2.0 4100 0 433.45 545.52 567.53 1.309 1.015 TCV4100 + 15-2.0 4100 + 15 380.75 480.34 481.27 1.264 1.001 TCV4100 + 30-2.0 4100 + 30 319.45 377.64 383.98 1.202 1.028 TCV4100 + 45-2.0 4100 + 45 276.73 296.57 318.52 1.151 1.026 平均值 1.143 1.019
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