城市轨道交通斜交隐盖梁门式墩曲线连续梁设计关键点研究

Key Points in the Design of Curve Continuous Beam Bridge for Urban Rail Transit

城市轨道交通高架桥在受地面道路净空和车站等控制点标高影响时,隐盖梁门式墩连续梁是一种较经济的结构形式。结合设计实例,阐述了曲线段隐盖梁门式墩连续梁的设计关键点。分别采用了桥博单梁模型和Midas有限元分析软件的梁格模型进行结构分析,对两种模型计算结果进行了比较。研究了隐盖梁斜交角度对连续梁受力的影响,明确了斜交隐盖梁门式墩的连续梁需采用空间梁格模型进行分析,并得出结论:在小半径曲线的连续梁弯扭耦合引起的隐盖梁下支座的横向位移可能超限,应引起重视。

When acrossing the city roads,urban rail transit bridges are often affected by the clearance of roads and the control points of station elevation,the continuous beam bridge with skew invisible coping of portal pier becomes an economic structure.Combined with a real design,the key points in the design of continuous beam bridge with skew invisible coping of portal pier are summarized.The curved single-beam bridge model and Midas FEA（finit element analysis）software based grillage model are used for structure analysis,and the calculation results of two models are compared.The effects of skew invisible coping on the continuous beam bridge are studied;it is made clear that the grillage model must be used in continuous beam bridge with skew invisible coping.The conclusion is that more attentions should be paid to the transverse displacement of the bearing caused by bending-torsion coupling of curve continuous beam bridge.