Experimental Study On Shear Behavior Of Inorganic Polymer Concrete Beams Reinforced With Basalt Tendons

In order to effectively solve the problem of corrosion of reinforcing steel in aggressive environments such as water engineering,ocean engineering structures,some chemical plant and the serious durability problems of concrete caused by freeze-thaw damage,wet and dry cycles,and sulfate erosion.This paper proposes to replace steel bars with basalt bars that are lightweight,high-strength,and have good corrosion resistance and fatigue resistance,and replace ordinary concrete with inorganic polymer concrete that is more compact to the microstructure and more resistant to corrosion,and combine these two materials.The shear properties of inorganic polymer concrete beams reinforced with basalt tendons were studied by experiments and ABAQUS finite element simulations.The research done in this paper is as follows:(1)The tensile test of BFRP tendons shows that the tensile behavior of BFRP tends to be brittle fracture failure.The stress-strain relationship is approximately an oblique straight line.(2)Through the shear test of inorganic polymer concrete beams reinforced with basalt tendons,the failure modes,cracking loads,ultimate loads,deflections,crack development processes,strains of BFRP bars and inorganic polymer concretes of the test beams with different shear ratios and stirrup rates were obtained,and compared analysis.The results show that all tested beams are shear-pressure failure;the load-deflection curve of the test beam has no obvious yielding platform and descending trend.The test beam cracking is a demarcation point,similar to a bi-fold line,under the same condition,the shear span ratio increases and the mid span deflection increases;there is no obvious relationship between deflection change and stirrup spacing;The test beam with shear span ratio of ?= 2.0 and 2.5 has lower cracking load of 10% and 20% than the test beam of ?= 1.5 and the ultimate load decreases by 3.9% and 29.4% respectively.The limit load of the test beam with the spacing S=100mm and 150 mm was reduced by 6.6% and 15.1%,respectively,compared with the test beam with S=80mm.(3)Based on the experimental data,the applicability of the FRP reinforcement building design specifications of the United States,Canada,Japan,and China to the prediction of the shear strength of the test beams was discussed.Meanwhile,based on the deflection calculation theory in the GB50608-2010 code of China,the mid span deflection of inorganic polymer concrete beams reinforced with basalt tendons is calculated and compared with the experimental value.The results show that: the Canadian CAN/CSA S802-12 has the best prediction effect on the shear capacity of the test beam,and has a certain degree of safety;the Japanese JSCE-97 specification is too conservative for its calculation,and its dispersion is also large;deflection calculation theory based on GB50608-2010 specification has certain guiding significance for calculation of deflection of inorganic polymer concrete beams reinforced with basalt tendons.Before the test beams are cracked,the calculation error of deflection is large,and the error after cracking is controlled within about 25%.The calculation is relatively conservative and has a certain safety degree.(4)The finite element simulation of the shear process based on ABAQUS is carried out and compared with the test results.The results show that the finite element simulation results are in good agreement with the experimental results.Finally,based on the existing specifications combined with experimental results and numerical simulations,the expression of the shear capacity of inorganic polymer concrete beams reinforced with basalt tendons is deduced.The results show that the formula can predict the shear bearing capacity of the test beam better.