Optimal Design of Corrugated Steel Deck Plate-UHPC Layer Composite Deck
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摘要: 为解决正交异性钢桥面板的疲劳问题，从其根本原因和提高其抗疲劳性能的基本途径出发，提出一种新型波形顶板-UHPC（超高性能混凝土）组合桥面板结构体系.确定影响新型桥面板受力特性的主要参数及其合理取值范围，使用基于BP（back propagation）神经网络的优化设计模型对结构进行优化设计，就所优化的结构尺寸进行疲劳性能测试.研究结果表明：该结构能大幅减少桥面板结构中的几何构型不连续部位数量和焊缝数量，显著提高顶板局部刚度；波形钢板高度、顶部和底部水平段宽度是结构受力性能的重要影响参数；基于BP神经网络的优化设计模型适用于该类桥面板结构的优化设计，最大误差为4.4%；新的结构体系具有良好的疲劳性能，疲劳寿命超过200 a，为正交异性钢桥面板的疲劳问题提供了较好的综合解决方案.
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关键词:
- 正交异性钢桥面板 /
- 波形顶板-UHPC组合桥面板 /
- 优化设计模型 /
- BP神经网络 /
- 疲劳性能
Abstract: In order to solve the fatigue problem of orthotropic steel bridge decks, an innovative corrugated steel plate-UHPC (ultra-high performance concrete) layer composite deck structure is proposed based on the cause of the fatigue problems and the basic approaches used to improve the anti-fatigue performance. First, the major design parameters that significantly impact mechanical properties and the corresponding ranges of the parameter values were determined using parametric analysis. A model based on the BP artificial neural network was developed to determine the optimal design of the innovative structure system. Finally, the fatigue performance of the optimal structure was studied. The results show that the number of geometric discontinuity locations and weld joints are decreased, while the local stiffness of the deck plate is increased. According to the results of the parametric analysis, the height of the corrugated steel plate and the width of the top and bottom horizontal parts of the plate play important roles in structure mechanical characteristics. The proposed optimal design model based on the BP(back propagation) artificial neural network is suitable for the optimal design of innovative structure systems, and the maximum error is 4.4%. The innovative bridge deck has good fatigue performance, and its fatigue life is over 200 years, which provides a comprehensive solution to the fatigue problem and has good potential for further development and application. -
图 1 波形顶板正交异性钢板-组合销-UHPC组合桥面板的构思
Figure 1. Conceptual design of corrugated steel deck-composite dowel-UHPC orthotropic composite deck structure
图 4 力学特性指标和关键参数间的关系
Figure 4. Relationship between mechanical properties and key design parameters
图 7 关注的疲劳细节热点应力横向分布
Figure 7. Transverse hot spot stress of focused fatigue-prone details
表 1 考察点位置汇总表
Table 1. Inspection positions in the structure
符号 位置含义描述 受力状态 σp1 位置1#处钢板的拉应力 纵向最大正弯矩 σp2 位置2#处混凝土的拉应力 纵向最大正弯矩 σp3 位置3#处混凝土的拉应力 纵向最大负弯矩 σp4 位置4#处钢板的压应力 纵向最大负弯矩 
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表 2 相邻指标相对重要程度rk赋值表
Table 2. Reference table of rk valuation
rk 说明 1.0 指标xk-1与指标xk具有同样重要性 1.2 指标xk-1比指标xk稍微重要 1.4 指标xk-1比指标xk明显重要 1.6 指标xk-1比指标xk强烈重要 1.8 指标xk-1比指标xk极端重要
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表 3 单目标优化结果
Table 3. Single objective optimal results
序号 h1 b1 b2 b3 单目标函数值 1 90 140 80 130 0.256 7 2 90 140 80 140 0.257 1 3 90 140 80 120 0.258 4 ⋮ ⋮ ⋮ ⋮ ⋮ ⋮
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表 4 拟合值与有限元值误差对照
Table 4. Comparison between fitted and finite element values
序号 考察点 拟合值/MPa ANSYS值/MPa 误差/% 1 σp1 28.20 27.95 -0.89 σp2 6.60 6.58 -0.30 σp3 -27.39 -27.19 -0.73 σp4 5.42 5.25 -3.14 2 σp1 28.92 29.47 1.90 σp2 6.85 6.95 1.46 σp3 -28.12 -28.65 1.88 σp4 5.50 5.46 -0.75 3 σp1 27.50 28.26 2.76 σp2 6.37 6.65 4.40 σp3 -26.75 -27.78 3.85 σp4 5.36 5.44 1.59
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表 5 疲劳寿命评估
Table 5. Evaluation on fatigue life
疲劳细节 ∑D Y/a D2顶板焊趾处 0.000 016 2 ＞200 D2横隔板焊趾处 0.000 005 7 ＞200
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