Cyclic Out-of-Plane Flexural Behavior of Masonry Walls Rehabilitated by Inserting Stainless Pins

Abstract eng:
We present the results of cyclic out-of-plane flexural tests of brick walls reinforced by inserting stainless pins. In seismic rehabilitation of historic URM buildings, preservation of their appearance poses the main difficulty. Inserting stainless pins diagonally in the plane perpendicular to the wall is a solution to overcome the difficulty. Since all stainless pins are inserted from mortar joints, no aesthetic alternation is caused by the method. In this paper, a series of cyclic flexural tests of brick walls are performed to study the effectiveness of the following two patterns of the reinforcement: (1) Stainless pins are inserted in parallel from one side of the wall. This reflects the pattern employed in practice. (2) Stainless pins are inserted from both sides of the wall so that they cross at the center plane of the wall. With this pattern, we aim to improve the seismic performance by making the reinforcement symmetric. From the tests, serious degradation of strength was observed in a couple of loading cycles when the former pattern of the reinforcement was applied. In contrast, almost no degradation was observed when the stainless pins were inserted in accordance with the latter pattern. From the results of the tests, we propose simple formulas for assessing the capacity of the reinforced brick walls. The effect of the latter pattern of the reinforcement was predicted well with the proposed formulas.

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