摘要
基于串并联弹簧随机损伤模型,结合损伤模型和断裂模型的耗散能等效原理计算得到了混凝土裂缝黏聚律;基于微弹簧断裂应变服从Weibull分布和对数正态分布,研究了不同概率密度函数对裂缝黏聚律的影响,并比较了所获得的黏聚律与采用位移等效方法获得的黏聚律的区别。依据得到的黏聚律模拟了三点弯曲梁裂缝扩展全过程,结果表明:混凝土裂缝黏聚律受微弹簧断裂应变服从的概率密度函数影响;基于串并联弹簧随机损伤模型得到的裂缝黏聚律基本不受串并联弹簧模型层数影响,避免了获取黏聚律时的模型层数敏感性问题。
Based on the series-parallel spring stochastic damage model,the cohesive laws of concrete were obtained by the method of energy dissipation equivalence between the damage model and the fracture model. The failure strain of the microsprings in the series-parallel spring model was assumed to be Weibull distribution and lognormal distribution, based on which the effect of different probability density functions on the cohesive laws was studied. The cohesive laws obtained by the present method were compared with those using the traditional displacement equivalence method. The obtained cohesive laws were also used to simulate the full crack propagation process of three-point notched concrete beams. The results show that the cohesive laws can be affected by the probability density functions and the cohesive laws based on the series-parallel spring stochastic damage model are not affected by the layer number of the model, avoiding the sensitivity problem of spring layers.
作者
卿龙邦
王苗
郝冰娟
QING Longbang;WANG Miao;HAO Bingjuan(School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)
出处
《水利水电科技进展》
CSCD
北大核心
2018年第4期38-43,共6页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51779069
51309073)
河北省自然科学基金(E2017202030)
关键词
混凝土
随机损伤模型
黏聚律
耗散能等效
裂缝
concrete
stochastic damage model
cohesive law
energy dissipation equivalence
crack
