The Effect of Bracing on Masonry Wall with Opening to Earthquake Response

Indonesia is a country that prone to earthquakes. The weak wall properties toward flexural and shear force is the main weaknesses so often damaged heavily because of earthquake. The bracing addition at the wall able to increase the wall resistance strength in facing the earthquake. The diagonal bracing use often difficult to implement if there is opening for window and doors. In the research, it is used two bracing model, that is knee bracing and inverted v-bracing. The specimen model is by using masonry wall constrained with wall dimension 120 cm × 100 cm, dimension of practical column beam 7 cm × 7 cm and opening dimension 70 cm × 30 cm is modeled single opening at the center of span. Bracing reinforcement material by using steel and bamboo. Based on the research results, the bracing use able to increase the structural resistance strength toward earthquake load compared with the opening wall without bracing when given cyclic load. The wall model with knee bracing from the bamboo reinforcement the strength increase 99% and deformation decrease of 31%. At the wall model with inverted v-bracing from the steel reinforcement the strength increase 297% and deformation decrease 37%. For wall model with inverted v-bracing from bamboo reinforcement the strength increase 128% and deformation decrease 38%. The bracing model differences and the bracing reinforcement material type influence the earthquake resistance strength and deformation decrease.