南京至安庆铁路新建工程需跨越321省道，线路与既有道路夹角仅为16.45°。为解决结构高度受限、斜交角度过小的问题，通过多方案比选确定采用(39.6+18.7+41.3+18.7+39.6) m的异形刚架桥，着重介绍开天窗和侧窗异形刚架的布置和设计。基于空间分析和动力特性分析总结异形刚架的受力行为和特点，对比分析空间和平面两种计算方法的差异性。计算结果表明，该结构能够满足无砟轨道桥梁的各项强度及刚度要求。%Nanjing to Anqing railway construction project traverses over No. 321 provincial road, and the angle between the new line and the existing road is only 16. 45 ° . In order to solve the structure height restriction and small skew angle, ( 39. 6+18. 7+41. 3+18. 7+39. 6 ) m rigid frame of special shape is selected after bridge type comparison. The paper focuses on the arrangement and design of the special shaped rigid frame with skylight and side window. The behavior and characteristics of the special shaped rigid frame are summarized, and the differences between two calculation methods of spatial and plane are compared and analyzed. The calculation results show that the structure can meet the requirements of the strength and stiffness of ballastless track bridge.
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