Shear behavior of interlocking masonry brick wall portal with the substitution of Mount Sinabung volcanic ash against pushover static load

Abstract

Earthquake events produce a shear damage effect on the interlocking masonry wall brick in the form of diagonal cracks. This shows that there's an influence of the resistance of the masonry to bear the shear force against the horizontal force in the direction of the wall plane caused by the earthquake. The purpose of this research is to determine the shear strength and crack patterns of walls against static loads and to utilize volcanic ash from Mount Sinabung as one of the constituent materials of interlocking masonry brick because the eruption activity of Mount Sinabung is also one of the most active in the world. The samples are in the form of a 3 m x 3 m wall surrounded by a 0.13 m x 0.13 m beam-column portal filled with interlocking masonry brick of 0.25 m x 0.125 m x 0.1 m with the optimum substitution of Mount Sinabung volcanic ash by 20% as a substitute for sand. Wall portal test was done by giving a pushover static load on the wall joint which refers to ASTM E 564-2003 to get the value of shear strength and crack pattern of the wall. From the static test results of interlocking masonry brick wall portal, the samples are able to accept a pushover load of 63931.2 N which results in an ultimate displacement of 35 mm with a crack thickness of 4 mm. The wall shear strength obtained is 21.31 N / mm. Based on the analysis of the equivalent energy elastic plastic (EEEP) curve, it is obtained that the elastic stiffness of the wall is 5905.88 N / mm and the wall's yield load is 57237.55 N with the deviation of 9.69 mm. Failure of the interlocking masonry brick wall portal is a shear failure characterized by cracking like a ladder pattern on the wall. Based on the crack pattern that occurs, the wall portal is a type of stepped cracks shear failure.