Research on Axial Pressure Performance of GFRP-Stone Dust Geopolymer Concrete-Steel Tubular Columns
WANG Tongkuai1,2,3, ZHAO Qi1,2, LEI Ting2,4, YANG Wenwei1,2,*
1 School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China 2 Ningxia Center for Research on Earthquake Protection and Disaster Mitigation in Civil Engineering, Yinchuan 750021, China 3 School of Architecture and Electrical Engineering, Hezhou University, Hezhou 542899, Guangxi,China 4 Xinhua College of Ningxia University, Yinchuan 750021,China
Abstract: Glass fiber reinforced polymer tube-stone dust geopolymer concrete-steel tubular columns (DSTC-GC) is a new type of composite column obtained by replacing ordinary concrete with waste marble dust geopolymer concrete. A total of 11 specimens were designed and manufactured to study the axial compression performance of glass fiber reinforced polymer (GFRP) and steel tube thickness, concrete type, section hollow ratio and other parameters. The results show that the DSTC-GC specimen has three typical failure modes, and the curve of the specimen shows typical bilinear strengthening. Compared with the ordinary concrete DSTC specimen, it is found that the load-steel tube strain curve has a gentle yield step. GFRP and steel tube have obvious influence on the mechanical properties and deformation of the specimens. Reasonable hollow ratio is beneficial to improve the efficiency and ductility of DSTC-GC specimens. When the content of waste stone powder is 50% (mass fraction), the axial compression performance of DSTC-GC specimen is better, while the axial compression performance of ordinary concrete DSTC specimen is better than that of DSTC-GC. Based on the test results, the functional relationship between fcc/fc0, εcc/εc0 and λt is established. It is found that Gao et al. ' s model is more suitable for the bearing capacity calculation of DSTC-GC specimens.
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2023, Vol. 37 
