Seismic evaluation of RC frame designed with effective and gross section using FBD and DDBD approach
- Vol.95(9), September
- Thane ACC LTD 2021
- 16-31p.
Seismic performance evaluation of RC frame designed based on stiffness of effective section as per IS:1893-2016 and gross section as per IS:1893 (2002), respectively is carried out. For this purpose, 2, 4, 7, and 10 story RC frames are designed using two design methods namely, force based design (FBD) and displacement based design (DDBD) considering effective and gross section properties of RC elements, respectively. The designed RC frames are analyzed using nonlinear static pushover analysis (NSPA) and nonlinear response history analysis (NLRHA) to obtain the pushover curve and the inter-story drift ratio (IDR), respectively. Response reduction (R) factor of respective RC frames is evaluated using the information received from the bi-linear idealization of pushover curves. The evaluated R factor of RC frame designed based on the stiffness of the effective section is observed to be larger than that of a similar frame designed with gross section properties. The R value of RC frames designed using the DDBD approach is observed to be higher as compared to the similar frame designed using the FBD approach, suggesting higher energy dissipation ability of DDBD frames during nonlinear behavior. The results of NLRHA show that the IDR of all RC frames, irrespective of whether they are designed based on stiffness of either gross or effective section using the FBD or DDBD approach, respectively, is less than the maximum allowable IDR, suggesting that both FBD and DDBD methodology is capable of designing structures with controlled residual behavior, irrespective of gross or effective section used in the design. However, the IDR of the RC frame designed based on the stiffness of the effective section is observed to be lower as compared to the frame designed based on the stiffness of the gross section.