FRP约束ECC的轴压性能试验与理论研究  

Experimental and theoretical research on axial compression performance of ECC confined by FRB

作　　者：邓宗才[1] 贾鹏星 Deng Zongcai;Jia Pengxing(The Key Laboratory of Urban Security and Disaster Engineering,Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程防灾减灾省部共建教育部重点实验室

出　　处：《建筑结构》2018年第19期77-81,39,共6页Building Structure

基　　金：国家自然科学基金项目（51578021）;北京市教委科技重点项目（KZ201810005008）.

摘　　要：为了研究纤维增强聚合物（FRP）约束高韧性水泥基复合材料（ECC）轴压性能,进行了33个FRP约束和3个未约束ECC圆柱的轴压试验,测定了应力-应变曲线,分析了纤维布种类和层数对约束圆柱轴压性能的影响。结果表明：FRP约束能有效提高ECC的强度和极限应变;影响约束ECC抗压强度的主要因素是约束比;影响极限应变的主要因素是约束比和约束刚度。基于试验结果,提出了强度和极限应变的预测公式,其预测精度较高;对Samaan模型中的f0和E2进行了修正,改进后的模型能更精确地预测FRP约束ECC的应力-应变关系。In order to study the axial compression behaviors of FRP confined ECC specimens under monotonic axial compressive experiment, thirty three FRP confined ECC specimens and three unconfined ECC cylindrical specimens were tested and the stress-strain curves were obtained.The influence effect of FRP types and layers of fiber sheets were analyzed.The results indicate that the FRP confinement was shown to improve both the ultimate strength and strain significantly.The confinement ratio is the major influence factor of the compressive strength and the confinement ratio and the lateral restraint stiffness are both the major influence factor on the ultimate strain of confined ECC.A new ultimate strength and strain perdition model was proposed, and the new proposed model presented the best fitting results.Based on the test results, the f0 and E2 in Samaan model were modified and the results show that the improved model can predict the stress-strain relationship of confined specimens more accurately.

关 键 词：纤维增强聚合物 高韧性水泥基复合材料 约束比 本构模型 

分 类 号：TU375.3[建筑科学—结构工程]