摘要
以新疆地区沙漠砂作为细骨料部分替代工程用砂,并在混凝土中掺入适量玄武岩纤维,制作了9根不同剪跨比、玄武岩纤维掺量和配箍率的玄武岩纤维高强沙漠砂混凝土梁,通过两点对称加载进行受剪破坏试验。基于声发射技术与分形理论对受剪梁损伤演化过程进行研究,定量分析了受剪梁损伤演化与不同变量因素间的规律。研究结果表明:声发射累计能量的增长随梁的破坏过程呈指数趋势,能量参数及梁表面裂缝分形维数随荷载水平的增大而增大,最大分形维数达到1.2068。在相同荷载水平下,当剪跨比为1.5、纤维体积掺量为0.4%时,试验梁损伤最小。建立了基于声发射参数和试验梁表面裂缝分形维数的受剪损伤模型。
Desert sand from Xinjiang was used as fine aggregate to partially replace engineering sand,and basalt fiber was mixed into concrete to make 9 high-strength desert sand concrete beams with different shear span ratios,basalt fiber content and different hoop ratios.Shear failure tests were carried out by two-point symmetric loading.Based on acoustic emission technology and fractal theory,the damage evolution process of shear beams was studied,and the law between the damage evolution of shear beams and different variable factors was quantitatively analyzed.The results show that the cumulative acoustic emission energy increases exponentially with the failure process of the beam.The energy parameters and the fractal dimension of the beam surface crack increase with the increase of the load level,and the maximum fractal dimension reaches 1.206.Under the same load level,the damage of the beam is the least when the shear span ratio is 1.5 and the fiber content is 0.4%.Based on acoustic emission parameters and fractal dimension of cracks on the test beam surface,a shear damage model is established.
作者
罗玲
李桐
刘雪梅
张泽敏
LUO Ling;LI Tong;LIU Xuemei;ZHANG Zemin(School of Civil Engineering&Architecture,Xinjiang University,Urumqi 830017,China;Xinjiang Civil Engineering Technology Research Center,Urumqi 830017,China)
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2023年第3期38-45,I0003,I0004,共10页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(51668060)
自治区高校科研计划自然科学项目(XJEDU2017I003)
兵团科技攻关项目(2019DB004)。
关键词
沙漠砂混凝土梁
玄武岩纤维
抗剪
损伤
声发射
分形维数
desert sand concrete beam
basalt fiber
shear resistance
damage
acoustic emission
fractal dimension
