Study On The Seismic Performance Of Sprayed GFRP Polymer Strengthened Brick Masonry Walls

Masonry structure types mainly include unreinforced masonry,reinforced masonry,reinforced block masonry and reinforced block shear wall structure.The masonry structure is mainly composed of compressive bearing capacity,tensile capacity and seismic performance poor.At present,spraying GFRP polymer to strengthen the masonry has many applications and is convenient for construction.The overall performance of the repaired and reinforced masonry structure is good,the spraying position is more flexible,and it has broad development prospects.This article discusses the seismic performance indicators such as ultimate bearing capacity,ductility and energy dissipation capacity of unreinforced masonry walls after spraying GFRP polymer.The main research contents and conclusions are as follows:1.Researched the comparison between walls reinforced with GFRP polymer(3thicknesses of 4mm,7mm,and 10mm)with double-sided spraying reinforcement of different thicknesses and walls not reinforced by spraying GFRP polymer;the wall adopts integral modeling,through The cyclic displacement load was applied,the crack development and stress distribution characteristics of 4 walls were simulated and compared,and the four seismic performance indexes were analyzed and compared;the results showed that the GFRP polymer reinforced wall with a thickness of 7mm should be controlled more reasonable.2.Under the action of cyclic displacement load,the wall adopts separate modeling.This time,7mm thick GFRP polymer is used to strengthen the wall,and the influence of different reinforcement methods under the same thickness on the seismic performance of the wall is studied.The reinforcement schemes include horizontal spraying,oblique spraying(X-type)and double-sided full spraying.The four models are analyzed and compared to analyze and compare the main tensile stress distribution characteristics,hysteresis curve,skeleton curve and energy consumption capacity;the results show that: The method of directional reinforcement is the most reasonable and economical.3.According to the experimental project in the literature,establish a two-story masonry structure model,use the integral modeling method to model,simulate and analyze the failure mode of the unreinforced masonry structure under the action of two vertical horizontal earthquakes,and Contrast with the test results;numerically simulated the main plastic strain cloud diagrams of the two-story unreinforced masonry structure before and after reinforcement,and compared and analyzed the reinforcement effect of the wall before and after reinforcement;the results showed that the simulation results of the unreinforced wall and the test results fit well Very high;the reinforced wall effectively limits the cracking of cracks,strengthens the integrity,and has a good reinforcement effect.