武器间接命中条件下FRP约束混凝土抗多次打击能力  

EXPERIMENTAL STUDY OF RESISTING MULTI-HITTING CAPACITY ON FRP CONFINED CONCRETE ON CONDITION OF INDIRECT DAMAGE BY WEAPONS

作　　者：潘景龙[1] 张宝超[1] 马晓儒[1] 李艳[1] 

机构地区：[1]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《复合材料学报》2004年第5期128-133,共6页Acta Materiae Compositae Sinica

摘　　要：在 3种约束比下FRP约束混凝土圆柱体试件准静载和快速加载试验的基础上 ,进行多次打击试验及多次打击后的准静载试验。结果表明 :FRP约束混凝土是一种抗多次打击能力较好的抗压复合材料 ,经每次打击后的刚度虽逐渐衰减 ,但有收敛趋势 ,其残余刚度随约束比 ξ及最大应力比 η的增加而减小。经受多次打击后的FRP约束混凝土与未经受多次打击的试件相比 ,其准静载下的初始弹性模量降低 ,强度基本不变 ,极限应变提高 ,其中弱约束混凝土延性提高得尤其显著 ,强约束混凝土应力 应变曲线中线性强化段的斜率随刚度衰减程度的增加而增加 ,最终FRP强约束混凝土有变成线弹性材料的趋势 。Based on the quasi-static and rapid loading test results of short cylindrical concrete specimens wrapped with fiber reinforced plastic (FRP) under three different constraint ratios (ξ), the multi-hitting test and quasi-static loading test after multi-hitting were conducted. The test results show that FRP confined concrete is a kind of material which can well resist multi-hitting. The stiffness of FRP confined concrete decreases along with increasing hitting times and also gradually converges. The final residual stiffness decreases along with ξ and η (ratio between maximum hitting stress and strength of FRP confined concrete) increase. For FRP confined concrete damaged by multi-hitting, compared with intact specimens, the elastic modulus decreases, while the strength is nearly unchanged and the ultimate strain increases. Ductility of FRP weak-confined concrete damaged by multi hitting obviously increases. The slope of linear strengthening of the stress-strain curve of FRP well-confined concrete damaged by multi-hitting increases along with the damage degree increasing and the final stress-strain curve of FRP well-confined concrete gradually approaches to linear elastic. This work provides the basis for further research on application of FRP confined concrete to defending structures.

关 键 词：FRP 约束混凝土 约束比 多次打击 

分 类 号：TU377.4[建筑科学—结构工程] TB332[一般工业技术—材料科学与工程]