Test on Mechanical Properties and Bearing Capacity Calculation of GFRP Bars Reinforced Seawater Sea-sand Concrete Beams Exposed to Marine Environment
CHEN Zongping1,2,*, LI Shengxin1, ZHOU Ji1, DAI Shangqin1
1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China 2 Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China
Abstract: To investigate the mechanical properties ofGlass Fiber Reinforced Polymer bars (GFRP bars) reinforced seawater sea-sand concrete beams exposed to marine environment, seven beams were designed for static loading tests using exposure environment, exposure duration, and sea-sand replacement ratio as various parameters. The failure process and failure mode of the specimens were observed, the load versus deflection curves were obtained. Then, the effects of various parameters on the ultimate bearing capacity, initial stiffness, and ductility coefficient of these beams were analyzed. The results show that, compared with the general atmospheric environment, the ultimate bearing capacity of specimen is improved by 28.0% after being exposed to salt-spray environment, while decreased by 13.0% after being exposed to tidal environment. During a 270 day exposure duration, with the increase of the exposure duration of tidal environment, the ultimate bearing capacity increases first and then decreases, while the initial stiffness and ductility coefficient of specimens both tend to decrease. The increase of sea sand replacement ratio is detrimental to specimens’ ultimate bearing capacity and initial stiffness. Finally, the calculation method of the flexural capacity of GFRP bars reinforced seawater sea-sand concrete beams exposed to marine environment is discussed.
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2023, Vol. 37 
