铁道标准设计Issue(7)：84-88,5.DOI:10.13238/j.issn.1004-2954.2015.07.019
铁路箱梁静载试验开裂原因分析及控制措施
Cause Analysis and Control Measures to Cracking of Railway Box Girder
孙金更1
作者信息
- 1. 中国铁道科学研究院标准计量研究所国家铁路产品质量监督检验中心，北京 100081
- 折叠
摘要
Abstract
With regard to the cracking identified under the static test for prefabricated post-tensioned prestressed concrete railway bridge simply supported box girder, this paper analyzes the causes of cracking with focus on early cracking due to the fact that the concrete inner temperature difference stress exceeds the tensile ultimate strength, which is caused by the temperature difference between the core and surface of the concrete, and the temperature difference between the surface and the environment in excess of the restricted 15℃ on account of the form removal during steam curing and in peak period of concrete hydration heating. The author demonstrates the inevitability of cracking during beam static load level 1. 0 test with concrete tensile limit strength fct=0, and anti-crack safety factor Kf=λ, further elucidates that it is the concrete transfinite temperature stress that gives rise to box girder cracking, and puts forward control measures to prevent early cracks.关键词
预应力混凝土/箱形梁/静载试验/抗裂性/开裂原因/温差应力/水化热Key words
Prestressed concrete/Box girder/Static /load test/Crack resistance/Cracking reason/Temperature difference stress/Hydration heating分类
交通工程引用本文复制引用
孙金更..铁路箱梁静载试验开裂原因分析及控制措施[J].铁道标准设计,2015,(7):84-88,5.
