毕业设计论文_路基上板式无砟轨道设计及计算 .docVIP

摘要 研究目的：轨道是直接承受列车荷载作用并引导列车运行的重要部分，因此轨道需要有足够的强度和稳定性。随着高速铁路的发展，有砟轨道因自身的缺点而无法适应，因此需要设计合理的无砟轨道结构来满足高速铁路对于高速度的要求。 研究方法：采用有限元理论，建立板式无砟轨道的梁—板—板模型，应用大型有限元分析软件MIDAS对模型进行求解，并对轨道板和底座进行配筋设计和校核。 研究结果：总结了荷载作用位置、扣件刚度、轨道板宽度、CA砂浆弹性模量、地基弹性系数等主要参数对轨道板、CA砂浆和底座的受力影响规律，求得列车竖向荷载作用下轨道板和底座的最不利弯矩。 研究结论：轨下垫层刚度在50～80kN/mmA砂浆弹性模量对钢轨与轨道板及底座板的位移影响不是很明显，地基弹性系数宜采用190MPa/m， Abstract The track is the important part which bears load directly and guide the train running, so the track should have enough strength and stability. Whit he development of high-speed railway, ballasted track cannot adapt to the development because of its own disadvantages. It is necessary to design reasonable ballast-less track structure to meet the high speed requirement of high-speed railway. Research method: Use the Finite Element Analysis to establish beam-slab-slab model of slab ballastless track ,and solve the model with the help of large scale application software-MIDAS, do the work of track slab and base reinforcement design and verification. Research method: Use the Finite Element Analysis to establish beam-slab-slab model of slab ballastless track ,and solve the model with the help of large scale application software-MIDAS, do the work of track slab and base reinforcement design and verification. Research results: Sum up the force influence of the loading position, fastener stiffness, the width of track slab, CA mortar elastic modulus, foundation elastic coefficient and other major parameters，and seek the most unfavorable moment of track plate and base plate under vertical loads. Keywords：Slab ballastless trackFinite element, Beam-slab model, Reinforcement 目录 1 绪论 1 1.1 无砟轨道概述 1 1.2 无砟轨道主要技术特点 1 1.3 世界各国无砟轨道发展情况 4 1.4 国内无砟轨道结构研究与工程实践 5 1.5 板式无砟轨道的结构与类型 7 2 我国的板式无砟轨道 15 2.1 我国客运专线主要无砟轨道结构型式介绍 15 2.1.1 CRTSⅠ型板式无砟轨道 15 2.1.2 CRTSⅡ型板式无砟轨道 17 2.1.3 CRTSⅢ型板式无砟轨道 19 2.1.4 CRTSⅠ型双块式无砟轨道 19 2.1.5 CRTSⅡ型双块式无砟轨道 21 2.1.6 岔区轨枕埋入式无砟轨道与岔区板式无砟轨道 21 2.2 板式轨道的技术要求 22 2.3 板式无砟轨道设计 24 2.4 板式无砟轨道结构设计原理 25 2.4.1 弹性地基梁理论 26 3.3.2 弹性