Overview on the Nonlinear Static Procedures and Performance-Based Approach on Modern Unreinforced Masonry Buildings with Structural Irregularity

Abstract

Performance-based design plays a significant role in the structural and earthquake engineering community to ensure both safety and economic feasibility. Its application to masonry building design/assessment is limited and requires straightforward rules considering the characteristics of masonry behavior. Nonlinear static procedures mainly cover regular frame system structures, and their application to both regular and irregular masonry buildings require further investigation. The present paper addresses two major issues: (i) the definition of irregularity in masonry buildings, and (ii) the applicability of classical nonlinear static procedures to irregular masonry buildings. It is observed that the irregularity definition is not comprehensive and has different descriptions among the seismic codes as well as among researchers, particularly in the case of masonry buildings. The lack of global language may result in the misuse of the procedures, while adjustments may be essential due to irregularity effects. Therefore, irregularity indices given by different codes and research studies are discussed. Furthermore, an overview of nonlinear static procedures implemented within the framework of the performance-based approach and improvements proposed for its application in masonry buildings is presented.

A comparative study on a complex URM building: part I—sensitivity of the seismic response to different modelling options in the equivalent frame models

“…Although the irregular plan of the building would suggest further interesting investigations on the use of other horizontal load patterns or more refined nonlinear static procedures, able to better account for the higher and torsional modes (e.g. as discussed in Azizi-Bondarabadi et al 2019or Aşıkoğlu et al 2021), these issues were out of the scopes of the research activity, mainly focused on comparing the results provided by EF models when adopted by using the same modelling and analysis method assumptions. Thus, also in performing the nonlinear static analyses and representing the results, the RTs adopted common hypotheses on the load pattern, the displacement plotted in the pushover curves and the choice of the control node (as much as possible close to the centre of masses).…”

Integration of Modelling Approaches for the Seismic Assessment of Complex URM Buildings: The Podestà Palace in Mantua, Italy

“…Of course, when applied to monumental buildings, particular attention has to be paid to its correct use starting from the aforementioned EF idealisations of walls that may present various sources of irregularities (in the opening layout, in the heterogeneity of materials, in the discontinuities, etc.). An overview on the issue, including the repercussions of irregularities in the performance-based assessment, is presented in [51]. Regarding the rules for EF idealisation specifically, although different criteria were proposed in the literature (e.g., [1,[52][53][54]), no agreed rules have been unanimously yet recognised.…”

The Journal Buildings: A Bibliometric Analysis (2011–2021)

“…The second largest citation stream is in red, starting in 2019 and further developing in 2021. These papers in red provide insights into and analysis of seismic vulnerability [34], seismic assessment [35] and nonlinear static procedures [36]. Other citation streams all contain only a few nodes.…”