摘要
基于统计理论和Monte-Carlo随机抽样原理,分别建立了纤维混凝土随机圆形、椭圆形和凸多边形骨料细观模型,提出并验证了纤维混凝土细观模型力学性能数值模拟试验方法,并针对不同粗集料形状的纤维混凝土细观模型进行了抗压和抗弯拉强度数值模拟试验。结果表明,数值模拟试验与试验室试验得到的抗压和抗弯强度的平均值误差分别为6.5%、4.8%,峰值误差分别为10.7%、15.6%,基于建立的细观模型进行力学性能数值模拟试验是准确合理的;纤维混凝土抗压强度随粗集料表面积的增大呈微弱降低的趋势,粗集料形状对试件的最终受压破坏形态有显著影响;三种粗集料形状的纤维混凝土受弯拉破坏形态都出现了多缝开裂现象,粗集料形状对抗弯拉强度没有明显影响。
Random circular, oval and convex polygon aggregate mesoscopic structure model of fiber reinforced concrete were estab- lished on the basis of statistical theory and Monte - Carlo random sampling principles. Test methods for the numerical simulation was proposed and validated based on the mechanical properties of fiber reinforced concrete mesoscopic model. The numerical simulation was simulated for the compressive and flexural strength based on the mesoscopic model of fiber reinforced concrete coarse aggregate in dif- ferent shapes.The results show that the mean error of the compressive and flexural strength between numerical simulation and laboratory tests is 6.5% and 4.8%, and the peak error is 10.7%and 15.6%.The numerical simulation experiment of mechanics performance based on the mathematical models is accurate and reasonable.Fiber concrete compressive strength is weak decreasing trend with an increase in the surface area of the coarse aggregate, coarse aggregate shape has a significant influence on the final compression specimen failure modes.Flexural tensile failure modes of three fiber concrete coarse aggregate shape were tested multiple cracking phenomenon,coarse aggregate shape has no significant effect on the flexural strength.
出处
《混凝土》
CAS
北大核心
2015年第12期97-101,共5页
Concrete
基金
中国博士后科学基金项目(2014M552397)
长安大学中央高校基本科研业务费专项资金资助(2014G1311081)
浙江省交通运输厅科研计划项目(2014H38)
关键词
纤维混凝土
粗集料形状
力学性能
破坏形态
数值模拟
fiber reinforced conrete
shape of coarse aggregate
mechanical property
failure characteristic
numerical simulation
