钢制组合式路基箱力学性能研究-土木工程专业论文.docxVIP

上海交通大学硕士学位论文 上海交通大学硕士学位论文 万方数据 万方数据 钢制组合式路基箱力学性能研究 摘 要 在我国大型核电建设项目中，模块化技术的应用使吊装的主要部件 重量大大增加。在安装和运输过程，大型履带式起重机对地面的压力也 随之急剧增大，容易引发吊车倾覆等工程事故。因此往往配合路基箱的 铺设来减少吊车对地基的压力，降低对地基处理的成本。本文通过有限 元软件 ANSYS 对多种规格的单个路基箱以及组合式路基箱进行分析。 研究表明，对单个路基箱而言，路基箱的承载能力随自身高度和各 类板件厚度的增加而增强。路基箱的分载能力即分压比随着地基基床系 数的减小而增大。对组合式路基箱而言，组合式路基箱的分载能力比单 个路基箱的分载能力显著提高。对于组合式路基箱，本文选取双体模型、 完全接触模型、完全刚接模型、面面刚接与面面接触相结合模型这四种 模型进行分析对比，得到刚接与接触相结合的计算模型最符合工程实际 情况。同时研究发现，减小地基刚度、增大木块间的形心距离，以及采 用钢片连接底部两个路基箱都可以提高组合式路基箱分载能力。最后通 过与现场试验结果对比可知，路基箱有限元模型与实际情况基本符合， 其结果能够比较合理地反映路基箱的受力和变形性能。 关键词：组合式路基箱，分压比，接触，地基基床系数 I- STUDY ON THE MECHANICS OF CONNECTED STEEL WELDED GRILLAGE SLABS ABSTRACT During the construction of large-scale nuclear power projects in China, the application of modular technology make the main component of hoisting weight increase significantly. As the weight of large crawler crane and its components increase massively, the pressure of large crawler crane on the ground will be more likely to cause engineering accidents, such as crane overturning, either in the process of construction or transportation . In the construction of nuclear power, the use of large crawler cranes often work together with laying welded grillage slabs to reduce the pressure on the ground, therefore contributes to safety of terminal and decreasing costs. By introducing the finite element software ANSYS, the article provides with the mechanical and deformation behavior of different types of welded grillage slabs and connected welded grillage slabs. Research shows that as the height and vertical plate thickness enhanced, the bearing capacity increased simultaneously due to the analysis of single welded grillage slabs.The load capacity, that is load division ratio, will increase as the elastic coefficient of foundation decreases. From the analysis of connected welded grillage slabs, it has better load capacity than single welded grillage slabs. To make it more convincing, the paper selected four models,the catamaran model, the completely contacted