GFRP约束微珠泡沫柱准静态受压性能

本研究对2根微珠泡沫柱及5根玻璃纤维复合材料(GFRP)约束微珠泡沫组合柱开展准静态轴压试验,探讨了GFRP层数、横向纤维与纵向纤维比例、泡沫密度等参数对组合柱极限承载力和吸能效应的影响,并与静态试验结果进行对比,研究不同加载速率对构件受压性能的影响规律.结果表明:准静态压缩作用下GFRP层数和泡沫密度的增加均提高了构...

Compressive Behavior of GFRP Confined Syntactic Foam Columns Under Quasi-static Loads

In this paper,two bare syntactic foam columns and five glass fiber reinforced polymer(GFRP)confined syntactic foam columns were tested to study the behaviors under quasi-static compression.The influences of the number of GFRP layers,fiber volumes in both transverse and longitudinal directions and syntactic foam density on the load carrying capacities and energy absorption capacities were discussed herein.Moreover,the test results of quasi-static compression were compared with those of static compression to study the influence of loading speed.The results showed that the load carrying capacities and energy absorption capacities of the components were increased with the increase of the number of GFRP layers and the syntactic foam density under quasi-static compression.Increasing the fiber volumes in both transverse and longitudinal directions resulted in the enhancement of load carrying capacities,while had insignificant influence on the energy absorption.Compared with the specimens under static compression,the specimens under quasi-static compression exhibited higher load carry capacity and energy absorption,which was attributed to the extensive failure region and larger deformation of the specimens under higher loading speed.A three-dimensional finite-element(FE)model was developed to simulate the compressive behavior of the tested specimens,and the numerical results agreed well with the test data.In addition,the FE model was used to study the influence of slenderness ratio of the hybrid columns,and the numerical results showed that the failure mode was changed from strength failure to instability failure when the slenderness ratio increased from 5∶1 to 10∶1.