جستجو در تالارهای گفتگو

DEVELOPMENT OF AN INNOVATIVE SEISMIC DESIGN PROCEDURE FOR 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 A displacement-based design (DBD) methodology for structures that are comprised of both frames and walls has been proposed and then tested through examination of several case studies. Strength proportions between walls and frames are decided before any analysis has begun. The various steps required to represent a frame-wall structure as a single-degree of freedom system are identified and a Direct DBD process is then adopted to set the required strength level. To test the design methodology, two sets of 4, 8, 12, 16 and 20-storey reinforced concrete structures are designed, with different proportions of the total strength assigned to the frames. A suite of time-history analyses have then been conducted to validate the methodology, which is seen to perform reasonably well. Finally, improvements to the procedure are outlined and areas for future research are identified. Keywords: Displacement based design; frame wall; dual system; seismic design. sullivan2005.pdf

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. [Hidden Content] Revised DDBD of frame-wall structures 2006 paper.pdf