Nonlinear Buckling Analysis of Suspended Domes Considering Initial Curvature of Members
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摘要:
为揭示杆件初弯曲对弦支穹顶结构稳定承载力的影响规律，以多段直梁法模拟杆件初弯曲，采用随机缺陷模态法引入不同形状及幅值的杆件初弯曲，对弦支穹顶结构进行非线性屈曲分析；引入整体缺陷与杆件初弯曲，考察2种缺陷的共同施加对结构稳定性能的影响. 结果表明：仅考虑杆件初弯曲时，弦支穹顶结构的稳定承载力系数平均值显著降低(最大降幅为33.84%)，该结构对杆件初弯曲较为敏感；相比于正弦全波，以正弦半波为初弯曲形状来引入杆件初弯曲，对结构的稳定性更为不利；相比于理想结构，同时考虑整体缺陷与杆件初弯曲时，结构的稳定承载力系数进一步降低(最大降幅为44.80%)，但其降幅小于两者分别引入的降幅之和，2种缺陷的同时施加，对结构的稳定承载力存在耦合影响，一定程度上削弱了两者单独引入时的不利影响.
Abstract:In order to reveal the influence laws of the initial curvature of members on the stability bearing capacity of suspended domes, a nonlinear buckling analysis of suspended domes was carried out by applying the multi-beam method to simulate the initial curvature of members and the random imperfection mode method to introduce the initial curvature of members with different shapes and amplitudes. The overall imperfection and the initial curvature of members were introduced to investigate the effect of the two kinds of imperfections imposed jointly on the structural stability behaviors. The results show that the mean coefficients of stability bearing capacity of suspended domes are significantly reduced when only the initial curvature of members is considered, and the maximum reduction is 33.84%, which indicates that the structure is sensitive to the initial curvature of members. Compared with the sinusoidal full-wave, the sinusoidal half-wave as the shape of initial curvature is more unfavorable to the structural stability. When the overall imperfection and the initial curvature of members are both considered, the coefficients of stability bearing capacity are further reduced for the suspended domes compared with the perfect structure, with the maximum reduction being 44.80%, but the reductions are smaller than the sums of reductions when the two kinds of imperfections are introduced separately. The joint action of the two kinds of imperfections has coupling effects on the structural stability bearing capacity, which weakens the adverse effects when the two kinds of imperfections are introduced separately to some extent.
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图 4 一次模拟所得的初弯曲幅值及方向角分布直方图
Figure 4. Distribution histograms of amplitudes and direction angles of initial curvature from one simulation
图 5 理想结构引入杆件初弯曲分布（放大50倍）
Figure 5. Distributions of initial curvature of members introduced in perfect structure （enlarged by 50 times）
图 6 稳定承载力系数分布直方图
Figure 6. Distribution histograms of coefficients of stability bearing capacity
图 7 仅考虑杆件初弯曲的稳定承载力系数平均值对比
Figure 7. Comparison of mean coefficients of stability bearing capacity considering initial curvature of members only
图 8 整体缺陷结构引入杆件初弯曲分布（放大50倍）
Figure 8. Distributions of initial curvature of members introduced in structures with overall imperfection （enlarged by 50 times）
图 9 同时考虑2种缺陷的稳定承载力系数平均值对比
Figure 9. Comparison of mean coefficients of stability bearing capacity considering both kinds of imperfections
图 10 不同模型对应的荷载-位移曲线对比
Figure 10. Comparison of load-displacement curves corresponding to different models
表 1 构件和材料规格
Table 1. Specifications of members and materials
结构部位 构件 材质 规格 上部单层
网壳凯威特
部分径向杆 Q355B ϕ219 × 12 环向杆 Q355B ϕ219 × 12 斜杆 Q355B ϕ203 × 10 联方
部分环向杆 Q355B ϕ203 × 10 斜杆 Q355B ϕ194 × 10 撑杆 Q355B ϕ168 × 8 下部索杆
体系环向索 内圈 平行钢丝
束，1670 级ϕ5 × 61 中圈 平行钢丝
束，1670 级ϕ5 × 91 外圈 平行钢丝
束，1670 级ϕ5 × 139 径向索 平行钢丝
束，1670 级ϕ5 × 55 
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表 2 仅考虑杆件初弯曲的稳定承载力系数
Table 2. Coefficients of stability bearing capacity considering initial curvature of members only
初弯曲形状 统计结果 正弦半波 3.361，3.328，3.382，3.390，3.391，3.398，3.377，3.345，3.338，3.355 3.343，3.367，3.324，3.401，3.344，3.368，3.371，3.353，3.375，3.350 3.387，3.379，3.340，3.389，3.389，3.340，3.320，3.313，3.378，3.401 3.282，3.378，3.404，3.369，3.370，3.331，3.444，3.371，3.333，3.342 3.310，3.361，3.394，3.402，3.338，3.314，3.377，3.348，3.337，3.359 3.383，3.405，3.358，3.351，3.360，3.383，3.391，3.329，3.349，3.421 3.365，3.414，3.346，3.386，3.354，3.339，3.357，3.393，3.418，3.364 3.339，3.361，3.364，3.339，3.362，3.345，3.384，3.348，3.346，3.336 3.356，3.403，3.346，3.350，3.409，3.375，3.379，3.393，3.377，3.326 3.355，3.312，3.336，3.397，3.382，3.351，3.332，3.404，3.397，3.385 $ {K_{\min }} = 3.282 $，$ {K_{\max }} = 3.444 $，$ \mu = 3.3642 $，$ {\sigma } = 0.028\;8 $ 正弦全波 3.424，3.416，3.406，3.416，3.395，3.387，3.409，3.357，3.400，3.415 3.410，3.392，3.406，3.395，3.370，3.369，3.390，3.409，3.380，3.399 3.370，3.400，3.413，3.422，3.398，3.385，3.405，3.422，3.424，3.423 3.377，3.401，3.392，3.403，3.421，3.360，3.408，3.393，3.407，3.411 3.397，3.440，3.406，3.390，3.392，3.410，3.381，3.391，3.411，3.397 3.388，3.397，3.409，3.419，3.388，3.409，3.403，3.366，3.372，3.388 3.410，3.399，3.367，3.386，3.427，3.412，3.394，3.401，3.411，3.402 3.383，3.393，3.400，3.415，3.392，3.427，3.398，3.421，3.393，3.373 3.387，3.390，3.409，3.395，3.384，3.395，3.406，3.414，3.401，3.416 3.343，3.413，3.376，3.406，3.395，3.394，3.400，3.410，3.387，3.410 $ {K_{\min }} = 3.343 $，$ {K_{\max }} = 3.440 $，$ \mu = 3.3987 $，$ {\sigma } = 0.017\;0 $
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表 3 仅考虑杆件初弯曲的稳定承载力系数对比
Table 3. Comparison of coefficients of stability bearing capacity considering initial curvature of members only
初弯曲幅值最大值 初弯曲形状 Kmin Kmax $ \mu $ $ \sigma $ 是否满足 χ2 检验 $ \mu - 3\sigma $ lmax/700 正弦半波 3.365 3.482 3.4243 0.0178 否 正弦全波 3.424 3.473 3.4453 0.0092 是 3.4177 lmax/600 正弦半波 3.344 3.469 3.4141 0.0216 是 3.3493 正弦全波 3.400 3.465 3.4401 0.0102 是 3.4095 lmax/500 正弦半波 3.356 3.461 3.4065 0.0192 是 3.3489 正弦全波 3.401 3.459 3.4334 0.0109 是 3.4007 lmax/400 正弦半波 3.305 3.476 3.3890 0.0305 是 3.2975 正弦全波 3.369 3.443 3.4215 0.0120 是 3.3855 lmax/300 正弦半波 3.282 3.444 3.3642 0.0288 是 3.2778 正弦全波 3.343 3.440 3.3987 0.0170 是 3.3477
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表 4 同时考虑两种缺陷的稳定承载力系数对比
Table 4. Comparison of coefficients of stability bearing capacity considering both kinds of imperfections
整体缺陷分布模式 初弯曲幅值最大值 最小值 最大值 平均值$ \mu $ 标准差$ \sigma $ 是否满足 χ2 检验 $ \mu - 3\sigma $ 随机缺陷 lmax/700 2.845 2.916 2.8840 0.0142 否 lmax/600 2.841 2.914 2.8809 0.0125 是 2.8434 lmax/500 2.843 2.940 2.8802 0.0137 是 2.8391 lmax/400 2.841 2.913 2.8741 0.0164 是 2.8249 lmax/300 2.833 2.912 2.8737 0.0153 是 2.8278 特征缺陷 lmax/700 2.773 2.848 2.8157 0.0129 否 lmax/600 2.770 2.862 2.8151 0.0157 否 lmax/500 2.769 2.859 2.8146 0.0186 否 lmax/400 2.775 2.899 2.8162 0.0198 是 2.7568 lmax/300 2.759 2.878 2.8077 0.0197 否
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