Comparison the effect of different repair method applying on masonry arch bridges

Small scale centrifuge models were used to study the behavior of arches repaired using different techniques. The models under test were 1/12th scale replicas of a 6 meter single span three ring arch. Two types of arch geometry. With span/rise of 4 and 2, were studied is a shallow and deep arch geometry. The models Were tested ill a centrifuge Under a steady equivalent gravity of 12g. Two types of 2-D and 3-D arch models Were studied which had the same geometry but different in the addition of spandrel walls. The 3-D models Were built with spandrel wails bill without any wing walls or parapet. The models were usually tested with fourteen passes of a rolling load and then Lip to the observation of first signs of failure to enable them to be suitable for applying a repair method. The repaired models were tested using the same procedure but up to the full failure load. Plastic mesh reinforcement. stitching, and concrete slab oil top of the soil backfill were applied as repair methods to the 2-D arch models. Stitching of arch barrel and the barrel to the spandrels, applying partial saddle concrete and strengthening of spandrel Wall Using reinforced concrete were tested in the 3-D arch models. The results are presented and compared with cacti other in this paper.