摘要
基于双K(开裂韧度和失稳韧度)断裂模型,研究高温后混凝土断裂性能.使用最高温度为600℃的10组楔入劈拉试件测量荷载—裂缝张开口位移曲线,计算混凝土的双K断裂韧度.根据权函数法,计算了基于Petersson黏聚应力软化曲线的黏聚断裂韧度值,并与黏聚断裂韧度的积分解析计算结果进行对比,两类计算结果吻合较好,论证了双K断裂模型对高温后混凝土的适用性.
Investigations on the residual fracture properties based on Double-K fracture model is implemented. The load- crack mouth opening displacement curves of ten groups specimens at the maximum temperature of 600 ℃ are obtained to calculate the Doubie-K fracture parameters. Using the Petersson softening curve of cohesive stress, the cohesive fracture toughness is calculated by weight function method and the result is compared to that by analytical integral method. The comparison results demonstrate a good coincidence and the validity of Double-K fracture model to post-fire concrete is proved.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第9期1305-1309,共5页
Journal of Tongji University:Natural Science
基金
土木工程国家重点实验室基金(SLDRCE09-D-02)
关键词
高温后
双K断裂模型
权函数法
黏聚断裂韧度
post-fire
Double-K fracture model
weightfunction method
cohesive fracture toughness
