重载铁路高墩大跨刚构连续梁桥设计研究

Design and Research of Heavy-haul Railway Continuous Beam Bridge with High Pier,Long Span and Rigid Frame

刚构-连续梁桥随着跨度、墩高、联长的增加,结构设计中对刚臂墩个数、合龙顺序、中跨合龙顶推力的选取以及结构稳定性等成为关键技术问题。以神瓦重载铁路永兴沟高墩大跨刚构连续梁桥为工程背景,通过理论计算和数值模拟相结合的方法,研究确定主桥采用3个刚臂墩,先合龙刚构-连续跨、再合龙刚构跨、最后合龙边跨的合龙顺序以及3 000 kN合龙顶推力等设计参数,有效地改善了梁、墩结构的受力状态;同时经计算可知,主桥在施工阶段及运营阶段均有良好的稳定性。

With the increase of span,pier height and link length,the selection of pier number,closure order,middle span closure jacking force and structural stability of the rigid frame-continuous beam bridge have become key technical issues.Based on the engineering background of the high pier and long-span rigid continuous beam bridge on Shenmu-Watang heavy-haul railway in Yongxinggou,it is concluded that the main bridge employs three rigid piers,the rigid frame-continuous span is closed first,followed by the rigid frame span,and then the side span,and 3000 kN jacking force and other design parameters are adopted based on the combination of theoretical calculation with numerical simulation,which effectively improves the stress state of beam and pier structures.Meanwhile,the calculation shows that the main bridge has good stability in both the construction stage and operation stage.