Research Of Blast-retrofit Infilled Masonry Walls

So far, a lot of basic researches concerning masonry wall’s anti-explosionperformance were carried out by the United States government and military. But alarge number of explosion test data have been normalized, and couldn’t be used forfurther analysis, as well as verifying the numerical simulation analysis results. And asfor the domestic, researches still be in the early stage, mainly are some numericalsimulation analysis. A new testing method for blast-retrofit masonry walls wasproposed by using drop hammer machine based on the Hunan university’s currentlaboratory conditions. Impact tests of CFRP reinforced and un-reinforced masonrywalls using drop hammer machine were conducted. Calculation models and methodsfor the resistance of un-retrofit and membrane retrofit masonry walls to lateraluniform pressure were introduced. And based on these introduced methods, resistanceof retrofit masonry walls under lateral pressure was calculated. Three typicalsimplified methods, include single-degree-of-freedom, pressure-impulse (P-I)diagrams, and response surface, were introduced to analyze the dynamic response ofmasonry walls under explosion.This thesis’s main research works were summarized asfollows:(1) Tests of reinforced and un-reinforced masonry walls under different impactloads using drop hammer machine were conducted, impact force time-histories weremeasured and recorded, also did the specimen’s macroscopic damage pattern.(2) Comparison of the performance of CFRP reinforced and un-reinforcedmasonry wall against impact load was carried out by studying the macroscopic failurepattern and impact force time-histories. Deficiencies of this new testing method werefounded and summarized, and some improvement suggestions were proposed.(3) Calculation models and methods for the resistance of un-retrofit andmembrane retrofit masonry walls to lateral uniform pressure were introduced. Andbased on these introduced methods, resistance of retrofit masonry walls under lateralpressure was calculated. According to the results, several suggestions about thereinforcement of masonry wall against explosion were put forward.(4) Three typical simplified methods, including single-degree-of-freedom,pressure-impulse (P-I) diagrams, and response surface, were introduced to analyze thedynamic response of masonry walls under explosion.