Experimental Research And Theoretical Analysis On Seismic Behavior Of Masonry Strengthened By SGFRP

The masonry structure is a kind of age-old architecture and still widely used in buildings all over the world today. Because of the materials'brittleness, masonry structure's shearing strength, lengthening strength and bending strength are very low. So the seismic behavior of masonry structure masonry is bad. As the approximation of masonry structure's life and improvement of seismic defensive criterion, it is necessary to repair and strengthen so many masonry structures to improve the seismic performance of them.The use of Fiber Reinforced Polymer (FRP) in structure reinforcement is a new technology, which are generally used in reinforced masonry structure by wrapping or pasting sheet of fabric on the surface of reinforced structure. As fiber reinforced polymer materials have some virtues such as high strength, easy handling, durability and not changing the appearance of the reinforced structure, the study and application of the reinforcement technology using on masonry structure have rapid development in recent years. Spray glass fiber reinforced polymer reinforcement technology is the latest technology in the field of structural reinforcement in the United States and some Europe countries. The strengthening process is high-speed spray the short glass fiber and high-performance mixed paste adhesive to be surface of the reinforced structure to improve and enhance the mechanical properties of the structure. The research and application about this technology main focus on reinforced concrete beams, plates and other components in our country and abroad, the reports about the research and application on masonry structure have not yet seen.In this paper, some exploratory studies about the seismic behavior of masonry strengthened by SGFRP have been done in three aspects of experimental research, theoretical analysis and finite element method.1. The SGFRP strengthened experiments about 5 masonry walls were carried out under low cyclic loads of seismic performance. The mechanical behavior and deformation characteristics about the strengthened walls were compared and analyzed, and the reinforcement effect in different glass fiber reinforcement layer and the length were discussed; the compression performance experiments on 10 masonry columns strengthened by SGFRP were done. The reinforcement effect on masonry columns about compressive mechanical behavior was compared and the reinforcement effect in different reinforcement plans was discussed. The results showed that spray glass fiber reinforced polymers can significantly increase the bearing capacity and deformation capacity of masonry structures. The thickness of GFRP layers and the length of glass fiber affect the reinforcement effect in a certain extent.2. Based on the experimental study, established SGFRP reinforced masonry shear wall calculation model, and the corresponding bearing capacity calculation formula was proposed. Reference related research results on FRP reinforced concrete columns, combining materials masonry structure features, the calculation model and corresponding bearing capacity calculation formula was established based on the experimental study. Comparative analysis of test data and results show that both in good agreement, and have some safety margin. The calculation formulas can be provided as references for the engineering practice.3. Using ANSYS finite element analysis software, the separate finite element models of the 4 walls were established and the loading method and boundary conditions were simulated. Finite element calculations simulate the layer of the wall and the reinforcement characteristics of the force and stress distribution, and testing process more consistent, and can reasonably explain the wall to the destroy mode.Finally the results of this research are summarized, and points out the need for further study and solve problems.