Structure: private building for residential use, isolated, located in Loro Piceno (MC), built in 1800, renovated in 2003. The building consists of two above-ground floors in the main body and one above-ground floor in the west extension with a vertical structure of sack masonry covered with solid bricks, perforated brick block partitions, and wooden floors and roof.
Foundations: main body underfounded with double reinforced concrete curb inside and outside cm 40x50h, placed on 10cm lean concrete, connected with brackets. Extension to the west and staircase body to the east, direct foundation, consisting of a reinforced concrete slab starting 0.2mt from the ground floor, thickness of about 50cm, not protruding from the outer vertical masonry and placed on 10cm of lean concrete.
Failure: the visual analysis of the building showed throughout the building, but with greater prominence in the northwest corner, a network of lesions with sub-vertical, sub-horizontal, and inclined courses. The crack pattern, with tensile failure, was produced by shear and bending stresses corresponding to asymmetrical deformations classifying the failure as differential vertical translation. The failure began following the 2016 earthquake and following.
Soil: from information gathered during the inspection and from the geological report, it appears that the following stratification is present:
– From p.c. to 0.5-1.8mt: loose silts with included and vegetable soil;
– 0.5-1.8 to 1.5-4.2mt: clayey silts constituting eluvial-colluvial deposits;
– 1.5-4.2 to 7.0-13.7mt: clayey silty loams and/or silty clays constituting the altered substrate;
Followed by silty-marly clays constituting the intact substrate.
The surface clay lithotype is subject to volumetric shrinkage and contraction by drying with subsequent swelling as a result of seasonal climatic and rainfall trends.
Request for action: seismic improvement work on house damaged by the earthquake events of 2016 and after.
