矿渣基地聚物混凝土柱抗震性能研究

Study on seismic performance of slag-based geopolymer concrete columns

为了研究不同强度等级的矿渣基地聚物混凝土柱的抗震性能,设计了3个普通混凝土悬臂柱试件和3个矿渣基地聚物混凝土悬臂柱试件,通过低周反复荷载试验,对地聚物混凝土柱的破坏模式、裂缝发展、滞回性能、位移延性、耗能性能、刚度与强度退化和承载力等进行了评估,分析了混凝土种类、混凝土强度对试件抗震性能的影响。结果表明,在低周反复荷载作用下,与普通混凝土试件相比,矿渣基地聚物混凝土柱的抗震性能并未明显改善;提高地聚物混凝土强度会改变地聚物混凝土柱的破坏模式,从而对部分抗震性能(延性、耗能能力)产生不利的影响;验证表明《混凝土结构设计规范》(GB 50010—2010)中受弯承载力计算公式对于地聚物混凝土构件的计算结果偏小,拓展到工程应用中偏安全。

To study the seismic performance of slag-based geopolymer concrete columns with different strength levels,three ordinary concrete cantilever column specimens and three slag-based geopolymer concrete cantilever column specimens were designed.through the low cyclic loading test,the failure mode,crack development,hysteretic performance,displacement ductility,energy dissipation performance,stiffness and strength degradation,and load-bearing capacity of geopolymer concrete columns were evaluated,and the influence of concrete type and concrete strength on the seismic performance of the specimens was analyzed.The research results show that the seismic performance of slag-based geopolymer concrete column is not significantly improved compared with ordinary concrete specimen under low cyclic loading;Increasing the strength of geopolymer concrete will change the failure mode of geopolymer concrete columns,thus adversely affecting partial seismic performance(ductility,energy dissipation capacity);the validation of the results shows that the bending load capacity calculation formula in Code for the Design of Concrete Structures(GB 50010—2010)underestimates geopolymer concrete members,and it is safer to extend it to engineering applications.