摘要
目的为减少大跨径桥梁施工对既有公路、铁路线运营的影响,达到缩短工期,节约成本的目的,提出一种临时墩体外转体法。方法利用Midas Fea软件建立转体球铰有限元模型,分析在匀速转动阶段、加速转动阶段和不平衡荷载下转体系统局部应力及位移。结果在匀速转动阶段,上、下球铰最大应力分别为39.79 MPa、49.34 MPa,满足强度要求;加速转动阶段,角加速度超过0.711 rad/s^(2)时,球铰最大应力超过设计值,角加速度超过0.716 rad/s^(2)时,球铰最大剪切应力超过设计值;在不平衡荷载作用下,转体球铰强度均满足设计要求,球铰边缘各点最大高差均小于加工规定限值。结论临时墩体外转体法可实现在最大偏心距下进行转体,施工完成后,球铰仍满足质量标准,可回收利用。
In order to reduce the influence of long-span bridge construction on the operation of highway and railway lines,shorten the construction period and save the cost,a temporary pier external rotation method is proposed.The finite element analysis model of the swivel spherical hinge is established by Midas Fea software,and the local stress of the swivel system under the uniform rotation stage,the accelerated rotation stage and the unbalanced load is analyzed.In the uniform rotation stage,the maximum stress of the upper and lower spherical hinges is 39.79 MPa and 49.34 MPa respectively,which meets the strength requirements.In the accelerated rotation stage,when the angular acceleration exceeds 0.711 rad/s^(2),the maximum stress of the spherical hinge exceeds the design value.When the angular acceleration exceeds 0.716 rad/s^(2),the maximum shear stress of the spherical hinge exceeds the design value.Under the action of unbalanced load,the strength of the swivel spherical hinge meets the design requirements,and the maximum height difference of each point at the edge of the spherical hinge is less than the processing limit.The external rotation method of temporary pier can realize the rotation under the maximum eccentricity.After the construction is completed,the spherical hinge still meets the quality standard and can be recycled.
作者
包龙生
刘欣然
冯欣然
于玲
BAO Longsheng;LIU Xinran;FENG Xinran;YU Ling(School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168)
出处
《沈阳建筑大学学报（自然科学版）》
CAS
北大核心
2024年第4期690-696,共7页
Journal of Shenyang Jianzhu University：Natural Science
基金
“十三五”国家重点研发计划项目(2018YFC0809600,2018YFC0809606)
沈阳市科技计划项目(23-407-3-19)。
关键词
临时转体墩
转体系统
体外预应力
有限元分析
转体球铰
temporary swivel pier
swivel system
external prestressing
finite element analysis
spherical hinge for rotation
