Seismic Vulnerability Assessment of Reinforced Concrete Buildings Using Hierarchical Fuzzy Rule Base Modeling

A reliable building vulnerability assessment is required for developing a risk-based assessment and retrofit prioritization. Tesfamariam and Saatcioglu (2008) proposed a simple building vulnerability module where the building performance modifiers are in congruence with FEMA 154. This paper is an extension of the building vulnerability assessment that include detailed performance modifier in congruence with FEMA 310 that is represented in a heuristic based hierarchical structure. Some of the input parameters are obtained through a walk down survey and are subject to vagueness uncertainty that is modelled through fuzzy set theory. A knowledge base fuzzy rule base modeling is developed and illustrated for reinforced concrete buildings damaged in the 1 May 2003 Bingöl, Turkey earthquake.

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Risk-Based Seismic Evaluation of Reinforced Concrete Buildings

Earthquake Spectra ◽

10.1193/1.2952767 ◽

2008 ◽

Vol 24 (3) ◽

pp. 795-821 ◽

Cited By ~ 41

Author(s):

Solomon Tesfamariam ◽

Murat Saatcioglu

Keyword(s):

Reinforced Concrete ◽

Fuzzy Rule ◽

Hierarchical Structures ◽

Rule Base ◽

Northridge Earthquake ◽

Reinforced Concrete Buildings ◽

Building Vulnerability ◽

Concrete Buildings ◽

Ranking Scheme ◽

Risk Parameters

Seismic resiliency of new buildings has improved over the years due to improved seismic codes and design practices. However, vulnerability of seismically deficient older buildings, designed and built on the basis of older codes of practices, poses a significant threat to life safety and survivability of buildings. It is economically not feasible to retrofit the entire inventory of seismically deficient buildings. Therefore, there is need for a comprehensive plan to identify critical buildings and prioritize their retrofit and upgrading requirements. A risk-based evaluation technique is proposed in this paper to quantify seismic assessment and develop a ranking scheme for reinforced concrete buildings. The seismic hazard, building vulnerability and consequence of failure are handled in hierarchical structures. Some of the input risk parameters, expressed as qualitative and quantitative quantifiers, are transformed into commensurable values. A knowledge-based fuzzy rule base modelling is developed and verified through the use of 1994 Northridge Earthquake data on seismic damage of reinforced concrete buildings.

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BASE ISOLATION IN SEISMIC RETROFITTING OF R/C BUILDINGS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2016.150 ◽

2016 ◽

Vol 3 (2) ◽

Author(s):

Alberto Dusi ◽

Marco Mezzi ◽

Tan Teng Or

Keyword(s):

Reinforced Concrete ◽

Seismic Vulnerability ◽

Base Isolation ◽

Human Life ◽

Lessons Learned ◽

Seismic Retrofitting ◽

Reinforced Concrete Buildings ◽

Building Vulnerability ◽

Concrete Buildings ◽

2009 L’Aquila Earthquake

The paper, based on the authors’ direct involvement in managing actual retrofitting design, reports on seismic vulnerability assessment, design and implementation issues related to the seismic retrofit of reinforced concrete buildings through base isolation. The retrofitting interventions design of damaged buildings involves three aspects: the damage survey, the assessment of the vulnerability of building in its original structural configuration, the design of intervention needed to reduce the building vulnerability up to a conventional level, normally indicated by the seismic standards. In the first part of the paper, the experience achieved in the retrofit of reinforced concrete buildings damaged by the Italian 2009 L’Aquila earthquake is presented by referring to a typical intervention designed by the authors. Topics related to conventional vs base isolation retrofitting strategies, structure’s performance, safeguard of human life, construction efficiency and repairing cost are analyzed with reference to actual case study. Lessons learned from the Italian experience have been critically applied to the design of retrofit intervention of a building, designed according to the current Nepal set of codes and under completion at the time of the earthquake, damaged by the Gorkha 2015 earthquake. In the second part of the paper activities carried out for the definition of a specific site seismic input, for the dynamic characterization of the building and for the design of the base isolation retrofit are presented.

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