Experimental Study On Masonry Wall With A Hole Strengthened By CFRP

Masonry structure is a kind of age-old architecture structure and is widely used in buildings. But the masonry structure' shearing strength, lengthening strength and bending strength are very low owing to the material' brittleness, so the aseismatic behavior of masonry building is lower, together with China is a more earthquake country, along with the augment of the habitation years and the heighten of the aseismatic criterion, the aseismatic strengthening problem is very important.The strengthening technique of Carbon Fiber Reinforced Polymer(CFRP) is a kind of structure strengthening method arisen in several years. Because it has many advantages, such as light weight, high strength, convenient construction, excellent corrosion resistance, high fatigue strength and thin additive volume etc, which makes it regarded in masonry structure field by people recently after it is used maturely in the concrete structure field (especially adapting to immemorial buildings owing to thin additive volume), and some groping study has been done. But the theory isn't mature, and a great deal of fundamental study needs to be done to generalize it and establish technique regulation.This paper expatiates Chinese masonry structure' actuality and existing reinforced methods, summarizes CFRP strengthening technique' study and applications actuality, and introduces the mechanics capability of CFRP and the adhesive. Then considering protecting immemorial buildings, through the experiment on seismic reinforcement of three low strength brick wall with a window and three low strength brick wall with a door by carbon fiber sheet under lower cycle reversal loads, the seismic reinforcement effectiveness is studied, such characteristics as the strengthened brick wall's failure shape , deformation , energy consumption, load bearing capacity and CFS's mechanics performance are generally analyzed, the different scheme's reinforcement is compared, and the factor on the increase of bearing capacity is discussed. Based on above analyses, the paper discusses the calculation of shearing capacity to two kinds of brick walls and presents the simplified calculating formula. The test result indicates that the strengthening technique of CFS can reduce the weaken effect to masonry brick owing to windows or doors and can improve low strength masonry structure' aseismatic capability. The application foreground is amplitude in masonry structure.At last, this paper concludes the experiment generally and presents some distinctive advices for further researching on CFRP-reinforcement of masonry wall in the future.