Experimental Study On Impact Performance Of Reinforced Concrete Piers Mixed With PVA Fiber Stainless Steel

In concrete structures,ordinary steel bars are easily passivated.In order to prevent steel corrosion and improve the durability of concrete structures,stainless steel bars can be used to improve the durability of concrete structures.Polyvinyl alcohol(PVA)fiber is a green building material.It can not only improve the durability of concrete structure,but also improve the impact performance of concrete structure.Therefore,the use of stainless steel bars and the incorporation of PVA fibers in concrete structures are of great significance in improving the impact performance of concrete structures.In this paper,the impact performance of reinforced concrete pier with PVA fiber stainless steel is studied.The main work and research results include:(1)Five specimens of reinforced concrete piers with PVA fiber stainless steel were designed and built.The impact performance of reinforced concrete piers with PVA fiber stainless steel was studied by horizontal impact test.Analysis of impact performance of reinforced concrete pier with PVA fiber stainless steel from dynamic response curve,ultrasonic detection and crack development.The results show that the impact performance of stainless steel reinforced concrete pier is the best when the ratio of length to length of PVA fiber is 1:4.(2)The impact performance of reinforced concrete piers mixed with PVA fiber stainless steel and ordinary reinforced concrete piers replaced by equal diameter is compared and analyzed.The impact properties of impact force time history curve,displacement time history curve and strain time history curve are analyzed.The results show that PVA fiber stainless steel reinforced concrete pier can improve the ability of specimen to resist impact force and impact deformation.(3)Using ANSYS/LS-DYNA finite element software to establish three-dimensional finite element numerical model of reinforced concrete pier with PVA fiber stainless steel under impact load.The impact time history curve anddisplacement time history curve of reinforced concrete pier with PVA fiber stainless steel are analyzed and compared with the test results.At the same time,the impact parameters are analyzed.The results show that the numerical simulation results are in good agreement with the trend of the dynamic response curve of the test.