جستجو در تالارهای گفتگو

Direct Displacement-Based Seismic Design of Eccentrically Braced Steel Frames Gerard J. O’Reilly & Timothy J. Sullivan Abstract A series of eccentrically braced frames (EBF) are designed and subjected to nonlinear analyses to highlight ambiguities and differences in current seismic design provisions for EBF structures. This provides motivation to implement better guidance for the checking of local displacement demand considerations and move towards a displacement-based design approach. A recently proposed direct displacement-based design (DDBD) procedure for EBFs is then described and further developed in this paper through the calibration of a spectral displacement reduction factors that relate the displacement of an inelastically responding structure to that of the equivalent linear representation used in the DDBD of EBFs. Such an expression is calibrated as part of this study using an experimentally validated numerical model also proposed here for the EBF links such that the actual hysteretic behaviour of the links is well represented. The DDBD guidelines are applied to EBF systems from 1 to 15 storeys in height and their performance is verified via nonlinear dynamic analyses using two different sets of design spectrum compatible ground motions. The results of the study indicate the robustness of the proposed DDBD method in limiting the interstorey drifts to design limits for a variety of EBF systems with short links, thus demonstrating that the proposed DDBD method is an effective tool for seismic design of EBFs. TandF_1485618928.rar

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

Development of a Displacement-Based Design Method for Steel Frame-RC Wall Buildings Article in Journal of Earthquake Engineering · February 2010 Impact Factor: 1.18 · DOI: 10.1080/13632460902995138 Reyes Garcia T. J. Sullivan Gaetano Della Corte Abstract A Displacement-Based Design (DBD) methodology for steel frame-RC wall structures has been proposed. The effectiveness of the methodology in limiting lateral displacements has been tested by designing a set of case studies. Their structural performance was investigated through nonlinear time-history analyses by using seven spectrum-compatible accelerograms. For the seismic intensity and modelling assumptions considered in this work, it is found that the proposed design methodology controls the lateral displacements of the buildings well. Keywords: displacement based design, steel frame-RC wall buildings, drift, displacement, time-history analyses Garcia et al (2010) Development of a displacement based design method for steel frame-RC wall buildings.pdf

DIRECT DISPLACEMENT-BASED SEISMIC DESIGN OF CONCRETE BUILDINGS MJN Priestley, MJ Kowalsky - Bulletin of the New Zealand National …, 2000 - cat.inist.fr Abstract A seismic design procedure is developed to enable concrete buildings to be designed to achieve a specified acceptable level of damage under the design earthquake. The acceptable limit is defined as a displacement profile related to limit material strains or code specified drift limits. In this procedure, the elastic properties, including initial stiffness, strength and period, are the end product of the design rather than the starting point. It is shown that the procedure is simple to apply, and results in significant differences from the more conventional force-based procedure. Designs for multi-storey frame and wall buildings are presented, and target displacements are compared with results from inelastic time-history analysis. Source 2000, vol. 33, no4, pp. 421-444 (14 ref.) Publisher New Zealand National Society for Earthquake Engineering, Wellington, NOUVELLE-ZELANDE (1974-1998) 33(4)0421.pdf

Displacement based design of reinforced concrete structural walls: an experimental investigation of walls with rectangular and t-shaped cross-sections Thesis (Ph. D.)--Clarkson University, 1995. Includes bibliographical references (p. 134-141) and abstract. Thomsen__Wallace-Disp-based_design_of_RC_structural_walls_An_experimental_investigation_of_walls_with_rectangular_and_T-shaped_cross-sections_NSF_report-1995.rar