Modified-modal-pushover-based seismic optimum design for steel structures considering life-cycle cost

Abstract

A modified-modal-pushover-based optimization technique is presented to design steel moment resisting frame buildings for minimizing the life-cycle cost based on the framework of performance based earthquake engineering. Modified modal pushover analysis (MMPA) procedure capturing the higher mode effect well is utilized to analyze the inelastic seismic demands of the structures subjected to the considered design earthquakes in terms of the Chinese seismic code for buildings, especially for the medium-to high-rise buildings. Furthermore, the life-cycle cost is formulated as the summation of the initial material cost and the future expected damage loss, which can be stated as a function of seismic performance levels and their corresponding failure probability by means of a statistical model. Meanwhile, the damage loss is explicitly and continuously expressed by the defined interstory drift index using the fuzzy-decision theory. Moreover, the powerful adaptive simulated annealing algorithm is applied to solve the discrete optimization problem due to the discreteness of standard steel sections. Finally, a 9-story planar steel frame is provided to illustrate the effectiveness of the proposed optimization design technique, which achieves not only more cost-effective design but greatly improves the robustness of the optimum design as well.

Life‐cycle cost optimization of semiactive magnetorheological dampers for the seismic control of steel frames

“…The references of Table 1 present the expected loss ratios for buildings under the earthquake excitations. Because these ratios are dimensionless, they have been used in different sites (e.g., previous studies [2][3][4][5][6][7] ).…”

“…[ 1 ] Therefore, in recent studies, the life‐cycle cost has been the seismic optimization goal of designing the control system for retrofitting (or seismic design) the structures. [ 2–9 ] Mitropoulou and Lagaros [ 3 ] investigated the performance and cost of seismic isolators using life‐cycle cost analysis. They showed that although the seismic isolator system is expensive, the life‐cycle cost is less than its fixed counterpart.…”

Assessment of the Effectiveness of Cabling System Configuration in Retrofitting Steel-Concrete Composite Buildings

“…Such problems include the sizing of individual members (sizing optimization problems), the selection of the most efficient placing of structural members (topology optimization) or a combination of both in order to achieve a single or multiple goals at the same time (multiobjective optimization). The existing literature is rich of papers proposing and applying optimization algorithms in structural problems [62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78].…”

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

“…Application to reinforced concrete (RC) frames illustrated that the proposed methodology can achieve a significant reduction of the direct construction cost and improved seismic performances. Zou et al (2007) and Li et al (2012) developed the optimization technique for minimizing the life-cycle cost using the nonlinear static pushover analysis.…”

“…Using nonlinear static pushover analysis as a optimization tool has been widely investigated (e.g. Ganzerli et al, 2000;Li et al, 2012;Liu et al, 2003Liu et al, , 2005Zou and Chan, 2005;Zou et al, 2007) since it can predict the structural seismic demands with acceptable accuracy and easy operation, as well as can avoid the confusion of selecting suitable ground motion as the seismic input for structural nonlinear optimization because different ground motion inputs can result in different final optimum solutions. Nevertheless, there is no investigation on the inelastic structural optimization for uniform damage design.…”