铁道标准设计2016，Vol.60Issue(5)：64-68,5.DOI:10.13238/j.issn.1004-2954.2016.05.014
顶推施工中支座脱空对混凝土箱梁受力性能的影响分析
Influences of Bearing Cavity on the Mechanic Performance of Concrete Box Girder during Incremental Launching
罗泽辉 1李冲杰2
作者信息
- 1. 中铁二院工程集团有限责任公司，成都 610031
- 2. 中铁二院昆明勘察设计研究院有限责任公司，昆明 650200
- 折叠
摘要
Abstract
During incremental launching, the inaccurate control of slide elevation and improper construction management may lead to bearing disengaging, which results in redistribution of the reaction force and inevitable increase of some support reaction, thus, local stress is obvious near the support location. So it is necessary to study the effect of the bearing disengagement on the mechanic performance of the concrete box girders. Based on the practice of incremental launching of a certain pre-stressed concrete continuous box girder bridge, a three-dimension finite element solid model is established and bearing disengagements under certain working conditions are analyzed. The results of the calculation indicate that the influence of bearing cavity on support reactions of concrete box girders and the local stress is relatively remarkable and the safety reservation of the roof and floor is reduced, and the beam displacement is enlarged and friction is increased as a consequence. Thus, bearings should be closely monitored in the construction process to avoid bearing cavity.关键词
混凝土箱梁/顶推施工/支座脱空/受力性能Key words
Concrete box girder/Incremental launching/Bearing cavity/Mechanic performance分类
交通工程引用本文复制引用
罗泽辉,李冲杰..顶推施工中支座脱空对混凝土箱梁受力性能的影响分析[J].铁道标准设计,2016,60(5):64-68,5.
