Effect of Perimeter Frames in Seismic Performance of Tall Concrete Buildings with Shear Wall Core and Flat Slab System

Abstract eng:
Tall buildings are being increasingly designed with structural system comprising of flat slab or flat plate system and shear wall core with or without perimeter beams. The behaviour of this system under lateral loads is dependent on numerous parameters such as the height of the building, floor plate size, size and location of the shear wall core, flat slab spans, amongst others. Importantly, it is also dependent on the provision or otherwise of a perimeter frame. The paper studies the effect of perimeter frames for structural systems with flat slab structure and shear wall core for different locations of the shear wall core and for different heights and spans of three concrete towers. In a structure with a central shear core, the effective depth of structure resisting lateral loading is practically equal to the depth of the shear wall core. Providing outriggers to such a system greatly helps in improving its behaviour by engaging the perimeter columns with the shear wall core and thus increasing the effective depth of structure participating in lateral load resistance. The effect of such perimeter frame with outrigger system is also studied.

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