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Structural Engineering and Mechanics
  Volume 49, Number 5, March10 2014 , pages 631-644
DOI: https://doi.org/10.12989/sem.2014.49.5.631
 


Seismic assessment and retrofitting of existing structure based on nonlinear static analysis
Pengpeng Ni

 
Abstract
    Seismic assessment and retrofitting of existing structure is a complicated work that typically requires more sophisticated analyses than performing a new design. Before the implementation of a Code for seismic design of buildings (GBJ 11-89), not enough attention has been paid on seismic performance of structures and a great part of the existing reinforced concrete structures built in China have been poorly designed according to the new version of the same code (GB 50011-2010). This paper presents a case study of seismic assessment of a non-seismically designed reinforced concrete building in China. The structural responses are evaluated using the nonlinear static procedure (the so-called pushover analysis), which requires its introduction within a process that allows the estimation of the demand, against which the capacity is then compared with. The capacity of all structural members can be determined following the design code. Based on the structural performance, suitable retrofitting strategies are selected and implemented to the existing system. The retrofitted structure is analyzed again to check the effectiveness of the rehabilitation. Different types of retrofitting strategy are discussed and classified according to their complexity and benefits. Finally, a proper intervention methodology is utilized to upgrade this typical lowrise non-ductile building.
 
Key Words
    seismic assessment; nonlinear static procedure; retrofitting; capacity; demand
 
Address
Pengpeng Ni : ROSE Programme, UME (Understanding and Managing Extremes) Graduate School, IUSS Pavia (Institute for Advanced Study, Pavia), Via Ferrata 1, 27100 Pavia, Italy
 

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