| As the principal load-bearing element and lateral force resisting element, stone masonry wall has a great influence on seismic behavior of stone building. In order to make sure stone wall can bear different seismic loads, a new approach to strengthen stone walls by reinforced with steel-mashed modified cement mortar is proposed. The seismic behavior of stone masonry walls strengthened by steel-meshed modified cement mortar is investigated.Four stone masonry walls strengthened with steel-meshed modified cement mortar were tested under low cyclic horizontal loading. Parameters investigated include strength of modified cement mortar, intensity grade of reinforcing steel bar and strengthening modes. The failure mode, bearing capacity, hysteretic curve, skeleton curve and energy dissipation of specimens were investigated. It was indicated that:(1) steel-meshed cement mortar can restrain the development of wall stairs form cracks, even change the failure modes;(2) the shear strength and hysteresis energy dissipation of the strengthened walls increased significantly compared to un-strengthened walls, each specimen has plump hysteretic loops;(3) adopting double-faced reinforcing mode and increasing surface mortar strength can improve the shear strength in different extent, and the former is much more remarkable, range of shear strengthen improvement of the double-faced reinforced one triple that of single-faced reinforced one;(4) intensity grade of reinforcing steel bar has little influence on shear strengthen. An empiric formula for calculating the bearing capacity of the strengthened walls are proposed and the results are close to the experiment.Nonlinear numerical simulation under monotonic loading on stone masonry walls strengthened with steel-meshed modified cement mortar were carried out by Abaqus program. The simulation results agree well with experimental results. The established finite element analytical model can predict the mechanical behaviour of reinforced wall accurately. |
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