Identification of Most Relevant Factors for Demolition: a Study on the Database of RC Demolished Buildings After L’aquila Earthquake

Abstract eng:
The evaluation of building reparability after damaging earthquakes is a complex issue, involving factors such as the damage state, residual capacity and post-earthquake safety, initial performance level with respect to design earthquake and repair and retrofit costs [1]. In the post-earthquake reconstruction process after the 2009 L’Aquila earthquake, the funding request had to be accompanied by a detailed assessment of repair costs, the pre-earthquake safety level respect to new building standard (%NBS) and, if needed, by a detailed design of retrofit intervention and costs. Here we examine the database of severely damaged buildings after L’Aquila, collecting information of repair and retrofit costs as well as the final decision on reparability, to determine most important factors influencing demolition decisions for Reinforced Concrete (RC) buildings; 122 out of 472 severely damaged RC buildings were demolished. A logistic regression is performed to estimate the probability of demolition p dem for building typologies. Considering pre-earthquake information, the construction age is the most influential parameter, with older buildings having a higher p dem . Other significant parameter is %NBS. Considering post-earthquake information, the repair cost is expectedly the most important parameter. It results that p dem can be expressed as a function of construction age, %NBS and repair costs.

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