A seismic emergency performance optimization model for infrastructure systems under demand differences: A case study in China

Abstract

Infrastructure systems play a crucial role in ensuring the safety of cities and the well‐being of residents after earthquakes. Meanwhile, infrastructure systems are vulnerable to earthquakes and may fail to provide necessary services, highlighting the significant need to improve seismic emergency performance. Nevertheless, the seismic emergency performance of infrastructure systems still lacks effective enhancement strategies and optimization models, which makes it challenging to devise and benchmark appropriate emergency enhancement actions. This study proposes an emergency performance optimization model for infrastructure systems against earthquakes. The model aims at maximizing the effects of resistance actions and short‐term recovery actions on infrastructure systems with consideration of residents' expectations of infrastructure performance after earthquakes. The efficacy of the proposed model is tested by a case study in China. Experiments and results illustrate advantages of the seismic emergency performance optimization and prioritize resistance and short‐term recovery activities within constraints set by available resources.

Seismic control of a smart structure with semiactive tuned mass damper and adaptive stiffness property

“…where k i max and k i min are preset adjustable maximum stiffness and minimum stiffness, respectively. In Equation (7), the variable stiffness range of SASD, and control effects of different numbers of SASD implemented along the height of the building will be discussed and compared in Section 4.…”

“…The schematic diagram of the enhanced earthquake protection smart structure with an SASD on the first story and an STMD on the top story is shown in Figure 5. In Figure 5, the SASD can vary its stiffness in real-time according to Equations ( 5)- (7); the STMD can retune its stiffness based on the displacement signal of the top story according to the WT-based algorithm, and switch its damping coefficient according to Equation (2). The combined control strategy of the smart structure with SASD and STMD is illustrated in Figure 6.…”

“…An earthquake is a very destructive and dangerous natural disaster, which will cause a serious impact on people's life and property safety 1,2 . How to effectively protect the safety of building structures under earthquake, improve its resilience 3–6 and control the dynamic response has always been a hot research topic in the field of earthquake engineering and structural control 7–9 …”

“…1,2 How to effectively protect the safety of building structures under earthquake, improve its resilience [3][4][5][6] and control the dynamic response has always been a hot research topic in the field of earthquake engineering and structural control. [7][8][9] The tuned mass damper (TMD), which is composed of mass, spring, and damping elements, is a popular mechanical device for vibration control. [10][11][12][13][14] For a passive TMD with a constant mass, the control effect is dependent on the frequency ratio and damping ratio.…”