Seismic optimization design for uniform damage of reinforced concrete moment-resisting frames using consecutive modal pushover analysis

Abstract

In this study, a practical optimization procedure is developed for uniform damage design of reinforced concrete moment-resisting frames using consecutive modal pushover analysis based on the framework of performance-based earthquake engineering. Consecutive modal pushover, which can capture the higher-mode effect well, is employed to derive the inelastic seismic demands of structures subjected to considered seismic hazards. Furthermore, the optimization problems are formulated using the profile of inter-story drift ratios and component hinge rotations to redistribute the steel reinforcements from components with low damage to ones that experience high damage under the constant-cost constraint, until a state of uniform damage distribution prevails. By applying the proposed design procedure to two prototype frames with five and eight stories designed using the Chinese Seismic Design Code (GB 50011-2010), the efficiency of the method as well as the variation of steel reinforcements is demonstrated. The seismic performances of final solutions and prototype frames are compared through nonlinear dynamic analysis for scenarios of 22 ground motions matching well with the code-compliant spectrum. The results show that the proposed method allows for a significant reduction of maximum story drifts combined with more evenly distributed story drifts and component hinge rotations, indicating better seismic performance for the optimized structures.

Performance-based seismic design optimization of reinforced concrete structures with multiple ground motions via surrogate model

“…The seismic performance of RC buildings is fundamentally governed by a combination of factors, including geometry configuration, material properties, component sizes, and section reinforcements (Bai, Jin, Zhang, & Ou, 2016). While the geometry configuration is typically predetermined based on architectural considerations and space constraints, and material properties are often chosen based on their availability, the sizes of components such as beams, columns, and shear walls, along with their respective reinforcement ratios, remain crucial design variables that can be optimized to achieve the desired seismic performance.…”

Practitioner-friendly design method to improve the seismic performance of RC frame buildings

“…Due to the prevalence of RCF, researchers have used different approaches to propose design procedures to achieve cost-competitive seismic designs that exceed code minimum performance. One approach is structural optimization (Arroyo and Gutie´rrez, 2017;Arroyo et al, 2016;Bai et al, 2016;Khatibinia et al, 2013;Li et al, 2010aLi et al, , 2010b, in which the optimal configuration of structural members is determined subjected to different constraints. Another approach is performance-based design (PBD; Fragiadakis and Papadrakakis, 2008;Hajirasouliha et al, 2012;Sinkovic´et al, 2016;Zameeruddin and Sangle, 2016;Zou et al, 2007), which finds a framework for its application in FEMA P-58 (Haselton et al, 2018); in PBD, buildings are designed to meet certain measurable seismic performance goals.…”

Seismic Performance Evaluation of Special RC Frames with Gravity Steel Columns under the Base Level

“…In the system, the performance of which is evaluated in this study, the upper part consists of special RC moment frames. Several research efforts have focused on developing methods to improve seismic design procedure of RC frames beyond minimum code requirements [1][2][3] and performance-based earthquake engineering is used to assess the effectiveness of these improvements [4,5]. Seismic collapse safety of ductile moment frames has been assessed by Haselton [6] and seismic collapse capacity of nonductile RC frames is evaluated and compared with ductile moment frames by Abbie et al [7].…”