Abstract
The capacity of a structure can be assessed using inelastic analysis, requiring sophisticated numerical procedures such as pushover and incremental dynamic analyses. A simplified method for the evaluation of the seismic performance of steel moment resisting frames (MRFs) to be used in everyday practice has been recently proposed. This method evaluates the capacity of buildings employing an analytical trilinear model without resorting to any non−linear analysis. Despite the methodologies suggested by codes, the assessing procedure herein described is of easy application, also by hand calculation. Furthermore, it constitutes a suitable tool to check the capacity of the buildings designed with the new seismic code prescriptions. The proposed methodology has been set up through a large parametric analysis, carried out on 420frames designed according to three different approaches: the theory of plastic mechanism control (TPMC), ensuring the design of structures showing global collapse mechanism (GMRFs), the one based on the Eurocode 8 design requirements (SMRFs), and a simple design against horizontal loads (OMRFs) without specific seismic requirements. In this paper, some examples of the application of this simplified methodology are proposed with references to structures supposed to exhibit global, partial and soft storey mechanism.
Highlights
The safeguard of the built heritage is gaining an increasing interest in structural and seismic engineering [1,2]
Rigid plastic analysis has generally been used as an assessment tool against vertical and horizontal loads
The novelty point of the procedure is to use the rigid plastic and elastic analysis joined with a performance-based evaluation aimed at assessing the seismic performance of existing buildings, ensuring a rapid mapping of the built heritage in terms of seismic vulnerability
Summary
The safeguard of the built heritage is gaining an increasing interest in structural and seismic engineering [1,2]. In the perspective of a seismic classification of the built heritage, it is necessary to define a standardizable, unique and user−friendly methodology [19,20,21,22]; recently, a simplified assessment approach has been developed concerning steel moment resisting frames (MRFs) [23] based on a trilinear model that needs only the elastic structural analysis and the rigid-plastic analysis and does not require any static or dynamic non−linear effort. The novelty point of the procedure is to use the rigid plastic and elastic analysis joined with a performance-based evaluation aimed at assessing the seismic performance of existing buildings, ensuring a rapid mapping of the built heritage in terms of seismic vulnerability
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