高速铁路桥梁施工中的裂缝成因及抗裂措施研究
Research on the Crack Cause and Crack Resistance Measures in High-speed Railway Bridge Construction
刘利江1
作者信息
- 1. 中铁十一局集团第五工程有限公司,重庆 400000
- 折叠
摘要
裂缝是高速铁路桥梁施工中常见的质量问题,严重影响着桥梁的结构性能和使用寿命.为减少高速铁路桥梁施工过程中裂缝出现的概率,提高桥梁结构的抗裂性能,文章从设计、混凝土收缩、荷载等方面对桥梁混凝土结构裂缝的成因进行了分析,并研究了纤维对混凝土抗裂性的影响,发现通过添加纤维,能明显减少混凝土裂缝的数量,提高抗裂能力,且混凝土加入不同类型的纤维时,抗裂效果存在明显差异,其中效果最好的为改性聚丙烯纤维.通过在混凝土中加入纤维,能减小混凝土的塑性收缩应力,延迟塑性收缩应力峰值出现的时间.
Abstract
Crack is a common quality problem in the construction of high-speed railway bridges,which seriously affects the structural performance and service life of bridges.In order to reduce the probability of cracks in the construction process of high-speed railway bridges and improve the crack resistance performance of bridge structures,this paper analyzes the causes of cracks in bridge concrete structures from the aspects of design,concrete shrinkage,and load,and studies the influence of fibers on the crack resistance of concrete.It is found that by adding fibers,the number of cracks in concrete can be significantly reduced and the crack resistance can be improved.When different types of fibers are added to concrete,the crack resistance effect is obviously different,among which modified polypropylene fibers have the best effect.By adding fibers to concrete,the plastic shrinkage stress of concrete can be reduced and the time when the peak value of plastic shrinkage stress occurs can be delayed.
关键词
高速铁路/桥梁/裂缝/抗裂性能/纤维Key words
high-speed railway/bridge/crack/crack resistance performance/fibre引用本文复制引用
出版年
2024
NETL
NSTL
万方数据