Based Mechanical Properties Of GFRP Reinforced Mortar-less Block Masonry

Masonry structures are widely used in civil engineering, but there exists someproblems in traditional masonry structures. GFRP reinforced Mortar-less masonrystructure proposed in this paper solves the problems of traditional masonry structures,but also take full advantage of the performance of GFRP to improve the mechanicalproperties of mortar-less masonry. The purpose of this research is to investigate theeffects GFRP exerts on compressive and shear properties of mortar-less masonry.Through experimental research and theoretical analysis, we conduct exploratoryresearch on mechanical properties of the GFRP reinforced mortar-less masonry.Firstly, this paper presents the advantages of mortar-less masonry structures andFRP fabric and its research status all over the world. Then through the experimentalstudy of eighteen compressive specimens and thirty-six shear specimens, we analyzethe effects exerted by GFRP on mortar-less masonry, including cracking load, ultimatebearing capacity, failure modes and deformation capacity. The results show that:GFRP delays the appearance of mortar-less masonry’s initial cracks and improves theultimate bearing capacity of mortar-less masonry in a certain range. By fitting theexperimental data, we can obtain the stress-strain curves and calculate the elasticmodulus of compressive specimen. Comparing the stress-strain curves of theexperimental group and the control group, we come to the conclusion that GFRPimproves the deformation properties of mortar-less masonry.When theoretically analyzing the compressive bearing capacity of the GFRPreinforced mortar-less masonry, the differences in deformation between groutedconcrete and block are ignored, the GFRP reinforced mortar-less masonry is thushomogenized into a single kind of material, and its basic theory is established on thebasis of theory of GFRP confined concrete columns.Based on the calculation methodof lateral restraint force which FRP exerted on cylindrical concrete columns, anequivalent diameter method is adopted to establish the calculation method of lateralrestraint force resulted from GFRP’s confinement on mortar-less masonry. Finally, theexperimental data in this paper are in good agreement with the values of the classicexpression that some researchers presents.Through the stress analysis of shear specimens, we establish its shear model andthe corresponding formula is proposed, then test data in this paper and that of YangWei Jun Yang’s are compared with the values calculated from the proposed formula, the results match well. Finally, we do theoretical analysis on the shear behavior of theGFRP reinforced masonry wall, then describing the main factors on the shear strengthof masonry wall and commonly used four theories about shear strength, by analyzingthe mechanism of GFRP bounding masonry wall, we establish shear model and shearstrength formula of masonry walls, and then comparing test data from some peopleand the calculated values from the corresponding formula, the results match well.