圣泉1号双线特大桥刚构-连续组合梁设计

Design of(40+6×80+40) m Rigid Frame And Continuous Composite Beam of Shengquan N0.1 Double Line Super Major Bridge

小半径曲线梁由于弯扭耦合效应,结构受力比直梁更为复杂;贵广线圣泉1号双线特大桥主桥采用(40+6×80+40)m预应力混凝土刚构-连续组合梁,位于R=600 m的曲线和-24.0‰纵坡上,为目前国内曲线半径最小、联数最多、跨度最大的双线铁路桥,设计难度较大。为了准确模拟结构受力及变形状态,文章通过"Midas Civil 2011"建立空间有限元模型,对其进行详细计算分析,最终得到该桥的受力响应,从而验证了结构设计的正确性。文章从孔跨确定、构造尺寸、参数选用、计算结果等方面对该桥的设计进行介绍,以供类似结构参考。

The structure stress of small radius curved beam is more complex than that of straight coupling effect of bending moment and torsion. （40 ＋ 6 × 80 ＋ 40 ） m prestressed concrete rigid beam has been adopted in ShengQuan NO. 1 double lines super major bridge on Guiyang-Guangzh beam, because of the frame and continuous ou railway, located on a curve of R = 600 m and a Longitudinal slope of -24.0‰, it is currently a double lines railway bridge with the least curve radius, the longest connected and the longest span in China. In order to accurately simulate the structure stress and deformation state, a space finite element model is established by using ＂Midas Civil 2011＂ finally, the bridge stress response is obtained based on the detailed calculation and analysis to verify the correctness of structure design. This pa- per presents the span, structure sizes, design parameters and computed results of the bridge, providing reference to the similar structures.