摘要
新建张唐铁路跨大秦铁路大桥上跨繁忙电气化大秦铁路,同时与铁路左右线相交,交角为45°58′。转体跨度64m,转体高度13~20m,转体重量达11 000t。为确保转体过程安全、顺利地进行,利用有限元建模分析,在转体前对转动桥梁进行了针对性称重试验,并根据试验结果进行合理配重。研究结果及工程实践表明：称重试验中,在拆除支架的过程中同时读取砂箱里土压力盒的数值,可以定量分析不平衡荷载;多点埋设的竖向位移传感器和水平向位移传感器实测数值为判断转动临界点提供了依据。配重计算中考虑正式转体时可能遭遇的风荷载,能有效防止转动失稳;试转后的二次配重能更好地确保转体过程的平稳、安全。
A newly-built bridge on Zhangjiakou-Tangshan Railway that crosses the DatongQinhuangdao Railway overpasses the busy electrified Datong-Qinhuangdao Railway,concurrently intersecting with the left and right railway lines at an angle of 45°58′.The rotated part spans 64 m,with a height of 13~20mand a weight up to 11 000 t.To ensure the safety and smooth operation of the rotating process,the finite element model was established for analysis,and the specialized weighting test was carried out for the bridge before the rotating operation,and rational counterweights were set according to the testing results.The results of the study and engineering practice indicate that in the weighting test,to read the data of the soil compression box in the sand box during the demolition of the scaffolding can quantitatively analyze the unbalanced loads.The data from the vertical and horizontal displacement sensors buried in multiple points provide reference for identifying the critical rotating point.In the counterweight calculation,taking into account of the wind load that would encounter during the formal rotation can effectively prevent the rotation failure.The second time counterweight after the trial rotation can better ensure the stability and safety of the rotating process.
出处
《世界桥梁》
北大核心
2015年第6期63-67,共5页
World Bridges
基金
中国铁路总公司科技研究开发计划项目
关键词
刚构桥
跨线桥
转体施工
称重试验
配重
有限元法
桥梁施工
rigid-frame bridge
overpass
rotating construction
weighting test
counterweight
finite element method
bridge construction
作者简介
宋满荣（1978～），女，讲师，2001年毕业于武汉工程大学土木工程专业，工学学士，2004年毕业于华中科技大学结构工程专业，工学硕士，2015年毕业于合肥工业大学结构工程专业，工学博士（E-mail：fgmsong@163．com）。
