摘要
对不同剪跨比(a/d)的纤维腹板增强复合材料夹层梁进行四点弯试验,得到其荷载-位移曲线和典型破坏模式,分析了不同剪跨比和纤维腹板厚度对其受剪机理影响规律。结果表明:剪跨比为1的试件承载力最大;随着剪跨比增加,腹板增强夹层梁极限承载力降低,延性性能降低,比强度降低;当夹层梁剪跨比小于3时,试件发生上面板压陷/芯材剪切破坏,当剪跨比大于3时,试件发生上面板受压屈服破坏;对具有相同剪跨比试件,纤维腹板能显著提高其极限承载力和延性性能,厚度越大,极限承载力提高效果越明显。
The mechanical behavior of GFRP ribs reinforced composite sandwich beams with different shear span-to-depth ratios(a/d)was explored according to four point bending tests.The load-deflection and the typical failure modes and the effect of the a/d ratios and the thickness of the GFRP ribs on the mechanism of GFRP ribs reinforced composite sandwich beams were observed.Test results indicate that specimens with a/d ratio of 1 show the highest load bearing capacity,and it decreases as the a/d ratios increase.And the ductility properties and the strength-to-weight ratio also decrease as the a/d ratios increase.Beams failed in skin indentation failure/core shear failure when the a/d ratio less than is 3,while beams failed in top skin compressive failure as the a/d ratio larger than 3.The GFRP ribs can improve the ultimate bearing capacity and the ductility properties of sandwich beams,the greater the thickness is,the more obvious the effect.
作者
赵旭东
陈寻
张富宾
ZHAO Xu-dong;CHEN Xun;ZHANG Fu-bin(School of Physics and Electrical Engineering,Weinan Normal University,Weinan 714099,China;Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212000,China)
出处
《复合材料科学与工程》
CAS
北大核心
2020年第8期58-63,共6页
Composites Science and Engineering
基金
国家自然科学基金项目(51708255)
江苏大学科青年人才项目(16JDG016)。
关键词
剪跨比
纤维腹板
夹层梁
延性性能
极限承载力
复合材料
shear span-to-depth ratios
FRP ribs
sandwich beam
ductility properties
load bearing capacity
composites
