废弃玻璃粉风积沙混凝土柱抗震性能试验研究

Seismic damage behaviour of aeolian sand concrete column mixed waste glass powder

为研究玻璃粉等质量取代20%水泥与风积沙等质量取代30%天然砂对混凝土柱抗震性能的影响,本文设计和制作4根混凝土柱试件。第1根是普通混凝土柱,第2根是玻璃粉等质量取代20%水泥的混凝土柱,第3根是风积沙等质量取代30%河砂的混凝土柱,第4根是同时用玻璃粉和风积沙分别等质量取代20%水泥和30%河砂的混凝土柱。通过低周往复荷载试验,对比分析各个试件的破坏形态、承载力、滞回性能、骨架曲线、耗能能力、延性系数、刚度退化规律和变形特点。结果表明:20%取代率的玻璃粉取代水泥和30%取代率的风积沙取代天然河砂均能提高混凝土柱的抗震性能,降低构件破坏程度;基于试验结果、Fajfar和Park-Ang提出的地震损伤模型,对其耗能因子β进行修正,得到了修正后的Park-Ang损伤模型,并与废弃玻璃粉风积沙混凝土柱的试验过程吻合较好。

In order to study the effect of replacing 20%cement with mass such as glass powder and 30%natural sand with mass such as wind-deposited sand on the seismic performance of concrete columns,this paper designed and produced 4 concrete column specimens.The first one is an ordinary concrete column,the second one is a concrete column with 20%of cement replaced by glass powder and other mass,the third one is a concrete column with 30%of river sand replaced by windy sand and other mass,and the fourth one is also made of glass powder.Concrete columns that replace 20%cement and 30%river sand with equal mass and aeolian sand respectively.Through the low-cycle reciprocating load test,the failure form,bearing capacity,hysteretic performance,skeleton curve,energy dissipation capacity,ductility coefficient,stiffness degradation law and deformation characteristics of each specimen were comparatively analyzed.The results show that:replacing cement with 20%substitution rate of glass powder and replacing natural river sand with 30%substitution rate of aeolian sand can improve the seismic performance of concrete columns and reduce the degree of component damage;based on the test results and the method proposed by Fajfar and Park-Ang For the earthquake damage model,the energy dissipation factor“β”was corrected,and the modified Park-Ang damage model was obtained,which was in good agreement with the test process of the abandoned glass powder aeolian sand concrete columns.