特大桥连续梁墩顶悬浇菱形挂篮结构稳定性数值模拟分析  

Numerical Simulation Analysis of Stability of Rhombic Hanging Basket Structure with Suspended Pouring at Top of Continuous Beam of Super Large Bridges

作　　者：高秉艳 GAO Bingyan(First Engineering Co.,Ltd.,China Railway 18th Bureau Group,Zhuozhou 072750,China)

机构地区：[1]中铁十八局集团第一工程有限公司,河北涿州072750

出　　处：《浙江水利水电学院学报》2024年第6期40-45,共6页Journal of Zhejiang University of Water Resources and Electric Power

摘　　要：以达拉盖跨京藏高速特大桥为例,建立了达拉盖跨京藏高速特大桥连续梁墩顶菱形挂篮结构的数值模型。通过对模型施加静载荷,模拟风载荷等动态因素,分析了挂篮结构在不同工况下的位移变化和应力变化。数值模拟结果表明,在静载荷作用下,悬浇菱形挂篮结构的水平位移和垂直位移随着观测时间的增加而逐渐减小,并最终趋于稳定;在动态因素的影响下,挂篮结构X方向和Y方向的最大主应力逐渐降低并趋于稳定,应力集中峰值均出现在观测第5天。挂篮结构的最大水平位移和最大纵向位移分别为17.32 mm和16.23 mm,均在设计允许范围内;X方向和Y方向的最大主应力分别为48 MPa和47 MPa,符合设计要求。分析结果表明,该连续粱墩顶悬浇菱形的挂篮结构具有较高的极限承载力,能够满足特大桥长期稳定运行的要求。Based on the case of Dalagai Beijing-Tibet High Speed Bridge,a numerical model of rhombic hanging basket structure at the top of continuous piers of the bridge is established.By applying static loads to the model and simulating dynamic factors such as wind loads,the displacement and stress changes of the hanging basket structure under different working conditions were analyzed.The numerical simulation results show that under static load,the horizontal and vertical displacements of the suspended rhombic hanging basket structure gradually decrease with the increase of observation time and eventually tend to stabilize;Under the influence of dynamic factors,the maximum principal stress in the direction X and Y of the structure gradually decreases and tends to stabilize,and the peak stress concentration appears on the 5th day of observation.The maximum horizontal displacement and maximum longitudinal displacement of the hanging basket structure are 17.32 mm and 16.23 mm respectively,both within the allowable design range.The maximum principal stresses in direction X and Y are 48 MPa and 47 MPa respectively,which meet the design requirements.It indicates that the hanging basket structure has high stability and good bearing capacity,which can meet the requirements of long-term stable operation of super large bridges.

关 键 词：特大桥连续梁 墩顶悬浇 菱形挂篮 计算模型 数值模拟 

分 类 号：U445[建筑科学—桥梁与隧道工程]