高层钢结构不同减震加固方案的抗震韧性评估

With the increasing demand for seismic strengthening of existing buildings, it has become a concern to evaluate the seismic strengthening schemes based on the seismic resilience. Taking a high-rise steel structure as an example, the presented paper compares two seismic strengthening schemes from the perspective of seismic resilience. Firstly, 20 seismic waves are selected from PEER earthquake ground motion database by the greedy algorithm to make their average acceleration response spectrum coincide with that of target acceleration response spectrum. Through the Monte Carlo Simulation, the lognormal distribution functions of repair cost, repair time, hurt ratio and death ratio are obtained, and the 84% fraction values are taken as representative values to evaluate the two reinforcement schemes. Finally, the two reinforcement schemes are further evaluated based on the proposed concept of reinforcement benefit ratio. The results indicate that the reinforcement scheme with more dampers may cause a higher cost, while the reinforcement scheme with fewer dampers is more economical. The main work conducted in the presented paper is the application of seismic resilience in the evaluation of seismic reinforcement schemes, which improves the theories of seismic reinforcement and provides reference for the further application of seismic resilience in seismic reinforcement practice.