Seismic assessment of RC building frames using direct-displacement-based and force-based approaches
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Seismic assessment of RC building frames using direct‑displacement‑based and force‑based approaches Anurag Sharma1 · R. K. Tripathi1 · Govardhan Bhat1 Received: 9 May 2020 / Accepted: 1 September 2020 © Springer Nature Switzerland AG 2020
Abstract The conventional force-based design (FBD) method has been in practice for seismic assessment of RC building frames. In the FBD method, the main focus is on the seismic forces over the structure. In recent years, various shortcomings have been pointed out by research works, for example assumed initial stiffness of structural components, inappropriate response reduction factors, etc. To overcome these limitations of FBD, many new techniques have been developed and implemented. One such method is the direct-displacement-based design (DDBD) method. In this, the basic assumption is that strength is less critical than displacement. DDBD is a design theory in which design criteria are articulated for achieving a specified level of performance goals that are subjected to the defined level of seismic hazards. In this paper, the vulnerability of buildings situated in high seismic regions in India has been assessed. Four- and eight-storey RC building frames are taken into consideration. The non-linear time-history analysis is carried out, and the inelastic behaviour of buildings in the form of base shear, inter-storey drift ratio (ISDR) and maximum displacement is assessed. Also, fragility curves have been developed considering the effect of ISDR. It is concluded that the DDBD approach is more reliable and efficient for designing RC building frames as compared to its counterpart FBD approach. Keywords Fragility curves · RC building frames · Time-history analysis · Direct-displacement-based design · Inter-storey drift
Introduction Research on the DDBD method for RC building frames has been extensively carried out during the last decade. Yet, it is still an active research area for researchers across the globe. The application of the DDBD method for designing RC building frames was first carried out by Priestley and Kowalsky [1]. Consequently, with time, the DDBD method was investigated and new developments came in. Panagiotakes and Fardis (2001) compared 4-storey RC buildings designed by the DDBD procedure and the procedure prescribed in Eurocode 8 [2]. Pettinga and Priestley (2005) applied the DDBD * Anurag Sharma [email protected] R. K. Tripathi [email protected] Govardhan Bhat [email protected] 1
Department of Civil Engineering, National Institute of Technology Raipur, Raipur, Chhattisgarh 492010, India
methodology to 6-storey RC tube-frame structures and tested it using time-history analysis. They studied the change in design displacement profiles and lateral force distribution [3]. In 2007, Priestley et al. [4] gave a detailed description of the DDBD method for RC building frames. An effective comparison was carried out between conventional FBD and DDBD for RC building frames by Sil et al. (2018) and Sharma et al. (2019),
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