COMPOSITE REPAIR TECHNOLOGY – CONSTRUCTIVESOLUTION ON MASONRY WALL’S STRENGTHENING(EXPERIMENTAL STUDY)

摘要

Existing buildings can contain structural components, the reinforced concrete girders andrnmasonry walls that do not meet the current requirements for load-bearing capacity,rnserviceability and durability. Repair or strengthening of existing buildings is already inrndaily research investigations and civil engineering practice. By the conventional repairrntechnologies in the case of strong seismic impact the relatively high mass of the steel orrnreinforced concrete strengthening sections can cause additional stresses due to increasedrninertia forces. The visual appearance of the building can also be spoiled by bulkyrnreinforcing elements.rnThe Fiber Reinforced Polymer (FRP) composites can provide a constructive solution onrnstrengthening alternative for unreinforced or inadequately reinforced masonry (URM).rnExternally applied FRP composites can be used to improve the in-plane and out-of-planernshear and flexural strength of piers and shear walls. In addition, the FRP composites canrnprevent dangerous debris from falling during and after damaging ground motion. ThernBulgarian research activities on the civil engineering application of the Advanced FRPrn(GFRP, CFRP, and AFRP) Composites are not really started and need significantrnresearch efforts.rnThis paper presents the preparation, implementation and analysis of the experimentalrninvestigation of the Advanced FRP Composites repair technology as constructive solutionrnon masonry wall strengthening. The experiment conducts the real loading and impacts onrn4 (four) bearing masonry walls [W=25cm(10"); H=220cm(88"); L=250cm(120")] untilrnreaching the unallowable limit state, in the form of cracks, of the structures. Supervenedrnmasonry walls strengthening with Advanced FRP Composites, and once again by thernloading and impacts, identical to the previous one, determination the extent of thernrehabilitated initial masonry walls' bearing capacity.