冻融循环作用后GFRP管混凝土轴压短柱力学性能

Mechanical properties of short axially compressed columns of GFRP pipe concrete after freeze-thaw cycles

为研究冻融循环作用对GFRP混凝土结构力学性能的影响,对冻融作用下GFRP管混凝土短柱的力学性能进行了研究。通过对GFRP管混凝土短柱进行冻融循环试验及压力测试,得到了不同冻融循环次数下GFRP管混凝土短柱的极限承载力、荷载-位移曲线以及荷载-应变曲线。试验结果表明:冻融循环作用对GFRP管混凝土短柱力学性能如极限承载力、弹性段长度及GFRP管与混凝土协同工作能力有较大的影响,具体表现为随着冻融循环次数的增加,GFRP管混凝土短柱的极限承载力、弹性段长度及GFRP管与混凝土协同工作能力均降低,根据试验结果,运用有限元模拟进行性验证,验证结果与试验结果吻合较好。

In order to study the effect of freeze-thaw cycles on the mechanical properties of GFRP concrete structures,the mechanical properties of GFRP pipe concrete short columns under the freeze-thaw action were investigated.The ultimate bearing capacity,load-displacement curve and load-strain curve of GFRP concrete short columns under different number of freeze-thaw cycles were obtained by freeze-thaw cycle test and pressure test.The test results show that the freeze-thaw cycles have a great influence on the mechanical properties of GFRP concrete short columns,such as ultimate load carrying capacity,length of elastic section and the co-working ability of GFRP pipes and concrete.Based on the experimental results,the finite element simulation was applied to verify the sexuality,and the verification results were in good agreement with the experimental results.