【作者】 方珊丹；

【导师】 唐新军；

【作者基本信息】 新疆农业大学 ， 水工结构工程， 2009， 硕士

【摘要】 叠瓦式底板是一种新型泄槽底板结构形式,因其既有减免空蚀破坏的功能,又具有适应堆石体变形能力较强的特点,而为国内外近期建成和在建、拟建的溢流面板堆石坝工程所普遍采用。对这种特殊结构形式的底板,已建工程大多凭工程经验来确定其结构尺寸,目前尚未见到专门针对该底板的内力计算公式。为了给今后同类工程安全合理地确定其结构尺寸和板内配筋提供依据,本文针对叠瓦式泄槽底板的结构特点,将其简化成置于弹性地基上的折线形弹性地基梁,在Winkler地基模型的基础上,考虑地基切向摩阻力对弹性地基梁的影响,采用弹性地基梁的基本原理和方法,通过分析、讨论弹性地基梁内力微分方程组及其特征方程解的形式,推导出了这种特殊形式底板的内力计算公式,并通过有限元方法和工程实例对其进行验证,证明该方法是合理可行的。利用本文所推导出的计算公式,分析了叠瓦式底板内力的分布情况及影响底板内力的主要因素,分析结果表明:叠瓦式底板工作时其底部处于受拉状态,且最大弯矩发生在折点处;板内最大弯矩值随法向地基系数的减小而增大;随着水平板长度的增加,板内弯矩值增大;随着底板厚度的增大,弯矩值减小。本文还将叠瓦式底板内力计算公式和计算步骤编制成MATLAB计算机程序,可为工程设计人员使用该公式进行计算分析提供方便。更多还原

【Abstract】 Imbricate-floor is a new form of chute floor structure,this new structure can not only reduce the cavitation erosion,but also has a ability to adapt to a great deformation of the rockfill,therefore it is adopted in many overflow concrete face rockfill dams.To this new special structure,the built projects mostly designed their structural dimension by experiences.Until now,there is no formula to calculate the internal enforce in this special floor.In order to offer references for some other same projects to confirm the structural dimension and reinforcement in the floor reasonably,according to the characteristic of the imbricate-floor,we predigested the imbricate-floor to the polygonal line of elastic foundation beam.In the basis of model of the Winkler foundation,we took the tangential frictional resistance into account,used a basic principle and method of elastic foundation beam,analyzed and discussed the differential equations of internal force and solutions for characteristic equationins in elastic foundation beam,and then derived the formula of this special floor.At the same time,we validated them to be reasonable and feasible by the finite element method and engineering examples.By the formula,we analyzed the distribution of the internal force and main factors which affected the internal force a lot in this floor.The results showed that the bottom of the imbricate-floor was in tension,and the max moment was in the fold point When the normal foundation coefficientwas decreasing,the max moment would be greater.The moment of the floor would be greater with increase of the horizontal length of the floor.The moment would be decreased by increase of thickness of the floor.In this paper,we made the formula and calculation process into a program in MATLAB which will offer convenience for the designers to analysis and calculate by this formula.更多还原