桥墩高差对三跨连续刚构桥受力及变形影响研究  

Influence of Pier Height Difference on Stress and Deformation of Three-span Continuous Rigid Frame Bridge

作　　者：宫大辉[1] GONG Dahui(China Railway 18th Bureau Group Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中铁十八局集团有限公司,天津300222

出　　处：《施工技术（中英文）》2022年第12期50-54,共5页Construction Technology

基　　金：中铁十八局集团有限公司科技研究计划课题(13-B01)。

摘　　要：为研究拱北湾大桥桥墩高差对三跨连续刚构桥受力及变形的影响,运用有限元软件建立不同主墩高差、不同跨度的刚构桥计算模型,对比分析不同跨度下桥梁高低墩受力及变形变化规律。结果表明,桥墩高差<30m时,高低墩间的弯矩差值较小;桥墩在高差>50m后,受到的剪力作用方向发生改变,高差应控制在50m内;桥墩高差在40m以内连续刚构桥桥墩受到的压应力作用相对平衡;桥墩高差控制在30m以内可有效控制桥梁变形。三跨连续刚构桥不同跨度下桥墩高差对桥梁受力的影响规律相近。综合考虑三跨连续刚构桥桥墩高差控制在30m内有利于连续刚构桥的受力分布和变形控制。In order to study the influence of pier height difference of Gongbeiwan Bridge on the stress and deformation of three-span continuous rigid frame bridge,the calculation models of the rigid frame bridge with different main pier height difference and different spans are established by using finite element software,and the stress and deformation variation rules of high and low piers of bridge with different spans are compared and analyzed.The results show that when the height difference of piers is less than 30m,the moment difference between high and low piers is small;when the height difference is more than 50m,the direction of shear force will change,and the height difference should be controlled within 50m;when the height difference is less than 40m,the compressive stress acting on the piers of continuous rigid frame bridge is relatively balanced;the bridge deformation can be effectively controlled if the height difference of piers is controlled within 30m.The influence of pier height difference on the stress of threespan continuous rigid frame bridge under different spans is similar.Considering that the height difference of piers of three-span continuous rigid frame bridge is controlled within 30m is conducive to the stress distribution and deformation control of the bridge.

关 键 词：桥梁工程 连续刚构桥 有限元分析 桥墩 高差 受力 变形 

分 类 号：U448.23[建筑科学—桥梁与隧道工程]