摘要
为了利用梁表面裂缝的分布和演化过程来研究玄武岩筋废旧钢纤维混凝土梁的受弯性能,对6根不同废旧钢纤维(Recycled Steel Fiber,RSF)体积掺量和配筋率的试验梁进行受弯试验,并运用分形理论对梁表面裂缝进行分析。验证了玄武岩筋废旧钢纤维混凝土梁表面裂缝分布的分形特征,其分形维数在0.89~1.07之间。探讨了梁表面裂缝分形维数与荷载等级、RSF体积掺量、配筋率及跨中挠度之间的关系。结果表明:分形维数与荷载等级和跨中挠度均呈对数增长关系;极限状态下,RSF的掺入减小了梁表面裂缝的分形维数,RSF体积掺量为1.5%时,分形维数最小为0.972 2;随着配筋率的增加,梁表面裂缝发展更充分,其分形维数也更大。
In order to use the distribution and evolution of cracks on the surface of the beam to study the bending performance of recycled steel fiber(RSF)reinforced concrete beams with BFRP bars,bending tests were performed on 6 test beams with different volume content of RSF and different reinforcement ratio.And the cracks on the surface of the beams were analyzed using fractal theory.The fractal characteristics of the cracks distribution were verified.Their fractal dimension is between 0.89 and 1.07.The relationship between the fractal dimension and the load level,the volume of RSF,the reinforcement ratio and the mid-span deflection were discussed.The results show that the fractal dimension has a logarithmic growth relationship with the load level and mid-span deflection.In the limit state,the incorporation of RSF reduces the fractal dimension.When the volume content of RSF is 1.5%,the minimum fractal dimension is 0.9722.With the increase of the reinforcement ratio,the cracks on the surface of the beam develop more fully,and the fractal dimension also becomes larger.
作者
范小春
吴伟
袁云林
FAN Xiaochun;WU Wei;YUAN Yunlin(College of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;Xinshi Construction Group Co.,Ltd.,Wuhan 430070,China)
出处
《硅酸盐通报》
CAS
北大核心
2020年第7期2165-2171,2177,共8页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金面上项目(41972271)
国家科技支撑计划(2014BAB15B01)。
关键词
玄武岩筋
废旧钢纤维混凝土
分形维数
表面裂缝
BFRP bar
recycled steel fiber reinforced concrete
fractal dimension
surface crack
