研究目的:桩板结构是一种新型的轨下基础结构型式,目前国内外均没有对应的设计规范,理论研究严重滞后于工程实践.本文针对桩板结构中跨部分,板两端固定情形,基于弹性理论和合理假定,建立板的受力及变形微分方程,推导了桩板结构中跨部分板的设计解析计算方法.研究结论:推导出的解析计算方法计算过程简单、明确,容易为工程设计人员所掌握,且计算参数都是工程设计常用参数、容易获取,有较好的普适性.采用文中的计算方法既可以分析桩板中板的挠曲变形及受力情况,又能求得作用在桩顶的荷载大小；计算结果能够反映桩板荷载分担与传递的一般力学性状规律,同时可为桩板结构理论研究和工程设计提供理论指导.%Research purposes: Pile - slab Structure is a new form of foundation structure under track. At present, there is no corresponding design code at home and abroad. The theoretical research seriously lags behind engineering practice. Based on elastic theories and reasonable assumptions, the differential equations of slab's stress and deformation are established so as to deduce the analytical solution to the mid - span slab of pile - slab structure with fixed ends. Research conclusions:This analytic calculation method is simple, clear and easy for engineering designers to master. Moreover, the calculation parameters are commonly used in engineering design and easy to gain with the universality of application. With the analytic method presented in this paper, not only can the flexure deformation and load bearing situation of the mid - span slab be found, but also can the load on the pile top be known. The calculation result can reflect the common mechanical regulation of the load sharing and transferring of the pile - slab. Furthermore, it can provide theoretical guidances for theory studies and engineering designs of pile - slab structure.
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