夹层桥面板应力分布及稳定性能试验研究

发布时间：2018-04-18 04:08

本文选题：桥面板 + 正交异性夹层板　；参考：《华南理工大学》2014年硕士论文

【摘要】：钢聚氨酯夹层板是在两层钢板之间注入聚氨酯核芯，，是由弹性体芯材与钢板内表层牢固粘接而成的新型复合夹层结构。该体系在国外已用于新铺桥面板、桥面板的更换与桥面板的修复加固等工程中。但这种新型桥面板结构在国内尚未应用，并且没有相应的设计规范及准则，为此本文以模型试验为基础，开展钢聚氨酯夹层结构桥面板应力分布与稳定性能研究。进一步揭示钢聚氨酯夹层桥面板的力学特点与稳定性能，为钢聚氨酯夹层结构技术在国内的应用提供可靠的依据。介绍了夹层板结构在国内外研究现状，以及夹层板结构在桥梁工程中的应用现状。分析了正交异性板、夹层板、正交异性夹层板的基本计算理论，介绍了稳定基本理论。进行了模型试验，依据相似原理与现有工程实例构造进行试验方案的设计。通过夹层板与普通钢板试验值比较分析，验证了夹层板在应力分布、强度、刚度等方面受力性能优于单层钢板。通过有限元计算值与模型试验值进行对比分析，验证了本次有限元模拟分析的准确性，得到了钢聚氨酯夹层板结构在局部车轮荷载作用下的受力规律与应力分布情况，研究了在局部车轮荷载、轴压荷载共同作用下的屈曲稳定性能。在模型试验的基础上，通过芯层厚度、钢板厚度、加劲肋间距等参数的变化，进一步研究了这些参数对钢聚氨酯正交异性夹层板屈曲稳定的影响。这些参数均对夹层板屈曲稳定影响显著，屈曲荷载、最大应力分布均随着参数变化而变化。
[Abstract]:Steel polyurethane sandwich plate is a new type of composite sandwich structure, which is composed of elastomer core and inner surface layer of steel plate, which is filled with polyurethane core between two layers of steel plate.The system has been used in the new paving of bridge deck, replacement of bridge deck and repair and reinforcement of bridge deck.However, the new bridge deck structure has not been applied in our country, and there is no corresponding design code and criterion. Therefore, based on the model test, the stress distribution and stability properties of steel polyurethane sandwich deck slab are studied in this paper.The mechanical characteristics and stability of steel polyurethane sandwich bridge deck are further revealed, which provides a reliable basis for the application of steel polyurethane sandwich structure technology in China.This paper introduces the research status of sandwich plate structure at home and abroad, and the application of sandwich plate structure in bridge engineering.The basic calculation theory of orthotropic plate, sandwich plate and orthotropic sandwich plate is analyzed, and the basic theory of stability is introduced.The model test was carried out and the test scheme was designed according to the similarity principle and the existing engineering examples.The stress distribution, strength and stiffness of sandwich plate are better than that of single layer steel plate.The accuracy of the finite element simulation analysis is verified by comparing the finite element calculation value with the model test value, and the force law and stress distribution of the steel polyurethane sandwich plate structure under the local wheel load are obtained.The buckling stability under the combined action of local wheel load and axial compression load is studied.Based on the model tests, the effects of these parameters on the buckling stability of steel polyurethane orthotropic sandwich plates were further studied by the changes of core thickness, steel plate thickness and stiffening rib spacing.These parameters have a significant effect on the buckling stability of sandwich plates, and the buckling load and maximum stress distribution all change with the change of the parameters.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U443.31

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