Evaluation of The Effect of Shear Wall Arrangement in Dual Systems Subjected to Lateral Loads

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Addis Ababa University


Dual structural systems are still efficiently used by civil and structural engineers to address the public demand for residential buildings, schools, hospitals and office buildings. Furthermore, they are effective in resisting lateral loads by combining the advantages of their constituents. However, dual structural systems with moment frames are designed to carry lateral forces in longitudinal direction entirely while structural walls are positioned in shorter side of the building to resist transversal lateral loads are challenged by Northridge earthquake. After then, this type of dual system is cited by Erdy Charles k. (2007) as dangerous combination of shear walls and moment resisting frames. Hence, in an effort to address this problem, comparative analysis among the sample dual system buildings with different shear walls arrangement is carried out and overall seismic performance of the dual system is evaluated using non-linear push over analysis method. Three cases of shear wall arrangements for each sample building are used to examine the effect of different shear walls arrangement on the whole system, their interaction with frames and their out-of-plane bending resistance. Results of non-linear push over analysis are obtained for each case in the form of capacity curves and plastic hinge formation patterns. The observation of these results shows that the overall seismic resistance capacity is dependent on the shear wall location. Also it reveals that the shear walls are vulnerable to local failure due to bending moment in their out-of- plane direction, regardless of their location. Therefore, caution should have to be taken during designing of this type of dual system in order to avoid premature collapse of shear wall in its out-of-plane direction, which may perhaps leave the building defence less to transversal components of earth quake load.



Sciences in Structural Engineering