Dynamic Behaviour of T-Shaped RC Walls Designed with Direct Displacement-Based Design

Abstract eng:
The behaviour of T-section walls in the direction parallel to the web is characterised by different strength and stiffness in the two possible loading directions, with the wall generally being stiffer and stronger when the flange is in tension than when it is in compression. In this paper, a comprehensive set of T-shaped walls is designed according to the Direct Displacement-Based Design principles, utilising the recently developed expressions for limit-state curvatures. The case studies are subjected to extensive nonlinear dynamic time-history analyses. Their performance is examined in terms of displacements, inter-storey drifts, moment and shear force, the envelopes of which are evaluated and compared to the ones obtained after applying the proposed modifications in the design process. Higher mode effects are investigated. Modelling issues related to T-shaped walls are raised, a set of guidelines within the direct displacement-based design frame are proposed and the current capacity design of cantilever walls is revised to include the particularity of T-shaped walls, leading to a more rationalised design of structures containing T-shaped walls.

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