摘要
以一座千米级悬索桥桥址为研究对象,利用大型有限元软件Midas Civil探讨600 m级劲性骨架混凝土拱桥外包混凝土的浇筑方案,通过计算对比分析不同工作面、分段数与横向浇筑顺序对劲性骨架受力与变形的影响,结果表明:工作面划分数目不同,劲性骨架最大应力位置也不同;随着工作面分段数的增加,拱脚下弦管和拱顶上弦管的钢管和管内混凝土应力并不同步增减,且最终拱顶下挠量随着分段数的增加略有减小;横向浇筑顺序三相比之前经验的横向浇筑顺序,对上下弦应力水平均有明显改善,钢管最大压应力降幅达7.2%,管内混凝土最大压应力降幅达10.5%,拱顶最大挠度降幅达7.87%,达到了较好的优化效果。
Stiff skeleton concrete arch bridge is an important type of bridges across the mountain canyon.With the increasing demand for larger span concrete arch bridge,it is necessary to solve the problem of pouring mass concrete on the stiff skeleton.This study takes a 1000 m suspension bridge site as the background,by large-scale finite element software MIDAS civil.The concrete pouring scheme of 600 m rigid skeleton concrete arch bridge is studied.Through the calculation and comparative analysis of the influence of different working surfaces,segments and transverse pouring sequence on the stress and deformation of the stiff skeleton,there are following conclusions.The maximum stress position of the stiff skeleton is different with different number of working sarfaces.With the increase of the number of segments in the working snr face,the stress of the steel tube and the concrete in the tube of the bottom chord of arch foot and the top chord of the arch crown does not increase or decrease synchronously.The final deflection of arch crown decreases slightly with the increase of the number of segments.Compared with the previous experience,the third transverse pouring sequence significantly improves the stress level of the upper and lower chords.The maximum stress drop of steel pipe is 7.2%,the maximum compressive stress drop of concrete in the pipe is 10.5%.The maximum deflection drop of arch crown is 7.87%,with a better optimization effect.
作者
童加明
邓年春
林春姣
李颢旭
李长胜
周大为
TONG Jia-ming;DENG Nian-chun;LIN Chun-jiao;LI Hao-xu;LI Chang-sheng;ZHOU Da-wei(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Engineering Structure Safety of Guangxi,Guangxi University,Nanning 530004,China)
出处
《桂林理工大学学报》
CAS
北大核心
2021年第4期791-796,共6页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(51878186,51868006,51738004)
四川省科技计划项目(2018GZ0052)
广西科技重大专项(桂科AA18118055)
广西科技计划项目(桂科AB17292018)
广西高等学校高水平创新团队及卓越学者计划项目。
关键词
铁路桥梁
600
m混凝土拱桥
数值计算
劲性骨架
外包混凝土
railway bridge
600 m concrete arch bridge
numerical calculation
stiff skeleton
outer-covered concrete
