Numerical Study of the Position and Dimensions of the Openings on the Seismic Ductility of the Reinforced Concrete Slab - Column Connections Having Flexural Reinforcing and Shear Bolts

Concrete slabs are of the main components of the concrete structures. Implementing flat slab is more simple and economic than other ones owing to it’s ease of formatting. Furthermore, the flat slabs mostly utilized in the buildings with relatively irregular plans of flat slab- column structures. Unfortunately, the typical structures are ready to punching are prone to shear failure, but such shear brittle failure can be controlled by reinforcing the shear. Shear bolts is a shear strengthening method the influence of which on the slabs has been investigated in the present study. In practical situations, it is often necessary to create openings in slab to allow electrical, water or air conditioning ducts to go through floors. The existence of openings and their form along with their dimensions and slab-column connections impact the strength and ductility of the slabs. These specimens were placed under vertical load and cyclic lateral loads. The vertical load for each specimen was kept and cyclic lateral load increased. When the peak tension created, displacement in different points of slab and ductility were compared among different specimens. The analysis results show that shear bolts can increase lateral peak load resisting capacity, the lateral drift capacity at peak load, and also the ductility of the slab-column connections. Shear bolts also change the failure mode of the slab-column connections. Shear bolts capacity of the slab resist the lateral loads increases. The square opening dimensions are smaller better and circular opening more ductility to square opening one with same space.