DIRECT DISPLACEMENT-BASED DESIGN OF FRAME-WALL STRUCTURES

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DIRECT DISPLACEMENT-BASED DESIGN OF FRAME-WALL STRUCTURES
T. J. SULLIVAN, M. J. N. PRIESTLEY and G. M. CALVI
ROSE School, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy
Received (05/09/2005)
Revised ( / / )
Accepted ( / / )
A Direct displacement-based design (DBD) procedure for structures that comprise both frames and walls is
presented in this paper. Within the new procedure, strength proportions between walls and frames are
assigned and are used to establish the design displacement profile before any analysis has taken place.
Knowledge of the displacement profile and recommendations for the combination of frame and wall
damping components enables representation of the structure as an equivalent single-degree of freedom
system. The Direct DBD process is then utilised to set the required strength level which is proportioned to
the structure in line with the initial strength assignments. To test the design methodology, two sets of 4, 8,
12, 16 and 20-storey reinforced concrete structures are designed. The first set considers frame-wall
structures in which the frames are parallel to the walls and the second considers structures in which linkbeams
connect from the frames directly onto the ends of the walls. A suite of time-history analyses are
conducted to validate the methodology, which is seen to perform excellently.
Keywords: displacement based design; frame wall; dual system; seismic design.

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