Anna BOSI1 / Martina MANDIROLA2
(1Vienna Consulting Engineering (VCE), Austria / 2EUCENTRE, Pavia, Italy)
Abstract: Each earthquake is a lesson for the engineering community: well-known concepts are largely confirmed, some aspects are underlined, and new ones appear or gain relevance.
This applies also to the recent earthquake that heat Emila region in May: the importance of a seismic design also for industrial buildings is the new aspect that this earthquake put into the attention but well-known concepts have also been largely confirmed in particular concerning masonry structures.
This paper reports the damage typologies observed during one week of post-earthquake assessment in Emilila region, in particular in the municipalities of Novi di Modena and Ferrara.
In general, two main elements have been identified:
In the countryside the damage is widespread and the level of damage is high.
In Ferrara low level non-structural damage is prevalent; high structural damage mainly affects very poor quality structures. In particular for old structures, the damage encountered is mainly a pre-existing one.
The higher level of damage that characterizes the constructions in the countryside is mainly due to proximity to the earthquake epicentre; nevertheless, the survey revealed that in general the quality of the buildings in the municipalities of the countryside is low. This applies also to the new structures visited; most of them presented low quality details and low or null seismic design.
In Ferrara was found that old structures retrofitted in the recent past presented almost null damage, while not-retrofitted old structures presented a diffuse pre-existing level of damage mainly induced by the ageing of materials and elements (in particular high flexible floors).
It was also interesting to notice as Ferrara still preserves a slight historical memory: a large part of the historical structures have old chains (even if probably not effective), most likely introduced after the strong seismic event that occurred in the city in the period 1570-´74.