Structural Engineering and Mechanics

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Lifetime seismic performance assessment of high-rise steel-concrete composite frame with buckling-restrained braces under wind-induced fatigue

  • Liu, Yang (State Lab. of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology) ;
  • Li, Hong-Nan (State Lab. of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology) ;
  • Li, Chao (State Lab. of Coastal and Offshore Engineering, Faculty of Infrastructure Engineering, Dalian University of Technology) ;
  • Dong, Tian-Ze (Department of Architecture and Civil Engineering, City University of Hong Kong)
  • Received : 2020.02.03
  • Accepted : 2020.10.07
  • Published : 2021.01.25
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Abstract

Under a severe environment of multiple hazards such as earthquakes and winds, the life-cycle performance of engineering structures may inevitably be deteriorated due to the fatigue effect caused by long-term exposure to wind loads, which would further increase the structural vulnerability to earthquakes. This paper presents a framework for evaluating the lifetime structural seismic performance under the effect of wind-induced fatigue considering different sources of uncertainties. The seismic behavior of a high-rise steel-concrete composite frame with buckling-restrained braces (FBRB) during its service life is systematically investigated using the proposed approach. Recorded field data for the wind hazard of Fuzhou, Fujian Province of China from Jan. 1, 1980 to Mar. 31, 2019 is collected, based on which the distribution of wind velocity is constructed by the Gumbel model after comparisons. The OpenSees platform is employed to establish the numerical model of the FBRB and conduct subsequent numerical computations. Allowed for the uncertainties caused by the wind generation and structural modeling, the final annual fatigue damage takes the average of 50 groups of simulations. The lifetime structural performance assessments, including static pushover analyses, nonlinear dynamic time history analyses and fragility analyses, are conducted on the time-dependent finite element (FE) models which are modified in lines with the material deterioration models. The results indicate that the structural performance tends to degrade over time under the effect of fatigue, while the influencing degree of fatigue varies with the duration time of fatigue process and seismic intensity. The impact of wind-induced fatigue on structural responses and fragilities are explicitly quantified and discussed in details.

Keywords

Acknowledgement

The financial supports from the National Natural Science Foundation of China (51738007, 51808099) and the National Key R&D Program of China (2016YFC0701108) are gratefully acknowledged. The authors also acknowledge the China Meteorological Administration for offering the recorded wind data.

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