Sustainable Selective Mitigation Interventions towards Effective Earthquake Risk Reduction at the Community Scale

Maria Polese,Marco D’Aragona,Marco Di Ludovico,Andrea Prota

doi:10.3390/su10082894

Maria Polese, Marco D’Aragona + Show 2 more

Open Access

https://doi.org/10.3390/su10082894

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Journal: Sustainability	Publication Date: Aug 15, 2018
Citations: 14	License type: CC BY 4.0

Affiliation: University of Naples Federico II

Abstract

Risk reduction policies are crucial in regions of high seismic risk, having significant exposure and building vulnerability. In Italy, the Sismabonus incentive mechanism was recently approved, which regulates the possibility of benefiting tax deductions after seismic strengthening interventions on buildings. This paper presents a simplified approach for evaluating the effects of implementation of the Sismabonus policy at the territorial scale. Considering only reinforced concrete RC building typologies, a speed method for calculating the probability of being in relevant risk classes is introduced and it is applied to a town in southern Italy. The evaluation is based on simplified modeling of lateral seismic behavior and on the estimate of the peak ground acceleration corresponding to the attainment of building capacity. The effect of possible retrofit interventions is also considered. This performance-based procedure allows for taking into account the cost for selective retrofit interventions and contemporarily to estimate the variation of mean expected annual loss that is obtained with building upgrading.

Highlights

It is well-known that seismic risk for a region depends on the hazard, on the vulnerability of the assets at risk and on the exposure
This paper presents a simplified approach for evaluating the effects of implementation of the Sismabonus policy at the territorial scale
The evaluation is based on simplified modeling of lateral seismic behavior and on the estimate of the peak ground acceleration corresponding to attainment of building capacity (PGAc) for relevant limit states, namely damage limitation (SLD) and life safety limit state (SLV)

Summary

Introduction

It is well-known that seismic risk for a region depends on the hazard, on the vulnerability of the assets at risk and on the exposure. Not being possible to intervene on seismic hazard, basic policy approaches aimed at disaster mitigation are either oriented to reducing the exposure (e.g., through growth restrictions or land-use regulations) either to mitigating the consequences of events The latter goal may be pursued by enhancing preparedness information, improving building codes for new buildings or promoting retrofit interventions for unsafe existing ones. Selective solutions increasingly mitigating the earthquake effects and with corresponding variable costs are investigated This performance-based procedure for evaluation of the modified risk-class allows for taking into account the cost for selective retrofit interventions and to estimate the variation of mean expected annual loss that is obtained with building upgrading [10,11].

The Sismabonus Incentive Mechanism

Probabilistic Assessment of Seismic Risk Class for Infilled RC Buildings

Modeling of Local Retrofit Interventions

Application for a Town in Southern Italy

Building Inventory

Risk Classes for Building Typologies

Discussion and Conclusions