【作者】 胡晓波； 张艳锋；

【Author】 Hu Xiaobo~1,Zhang Yanfeng~2 (School of Civil and Architecture,Central South University,Changsha,410075)

【机构】 中南大学土木建筑学院；

【摘要】 针对客运专线无砟轨道道床板混凝土易收缩开裂的现状,本文设计相应的混凝土试件,采用楔入式紧凑拉伸试验方法对道床板混凝土进行稳定断裂试验,获得了比较稳定的断裂全曲线,如荷载-裂缝口张开位移(P-CMOD),裂缝口尖端的荷载应变曲线等。结合相关曲线,分析计算试件的起裂荷载、裂缝口最大位移、断裂能等关键参数。这些参数为进一步建立混凝土的断裂本构模型分析断裂性能提供了试验基础,同时也为无砟轨道道床板抗裂设计提供了相关参考。更多还原

【Abstract】 For the fact that the concrete in the the unballasted track bed slab of railwayline for passenger traffic are very easy to shrink and product cracks,these paper design some corresponding concrete specimens for the stable fracture test using wedge-split tensile method. Stable whole fracture curves can be obtained from this test such as load-crack mouth open displacement(P-CMOD) and the load-strain curve of the tip of crack.We can analysis and calculate crucial parameter such as the initial cracking load and the maximum value of CMOD and the fracture energy.These parameters provided the experimental foundation for establishing the concrete constitutive model to analysis the fracture properties and also give reference for the anti-crack design of the unballasted track bed slab.更多还原