Abstract
Many buildings and heritages are yearly damaged due to new construction plans in vicinity of them. Current engineering practice in Iran lacks unfortunately regulations to enforce the designers of new buildings to re-evaluate the structural integrity of adjacent old buildings which are prone to unacceptable induced settlement and distortions. To damage assessment of old building, deflection ratio was used for unreinforced load-bearing wall (masonry) building. In this paper some practical methods like story limits for the new buildings according to the specification of old structure, improvement of shallow foundations and increasing the embedment depth of new foundations have been studied in order to decrease the settlement and undesirable effects of adjacent constructions. Parametric studies using numerical analysis, Flac3D, have paved the way how above mentioned methods can remedy the problem. So induced consolidation settlements due to new construction in adjacent building were studied. In conclusion, increase of admissible story of new building up to one floor by increase of embedment depth as much as one meter and three floors by using of mat foundation instead of single footing were highlighted these methods.
Highlights
Today with the increasing development of cities and high rise buildings in urban areas, it’s necessary to keep an eye on the destructive effects of new constructions on the existing old buildings which are mainly small and masonry
When a new building construction happens in vicinity of another building, in view of geotechnical concerns two major risks arise: 1. Soil rupturing and sliding in vicinity or underneath the existing foundation caused by excavation of a new foundation
Three measures, namely the story limits for the new buildings, increasing the embedment depth of new foundations and the proper choose of the shallow foundations for the new building are typical methods to reduce damage imposed on the adjacent old building
Summary
Today with the increasing development of cities and high rise buildings in urban areas, it’s necessary to keep an eye on the destructive effects of new constructions on the existing old buildings which are mainly small and masonry. The experimental study by conducting a number of laboratory scaled model tests on the effect of interference between two adjacent surface strip footings was on reinforced sand was carried out by Ghosh and Kumar [9]. Their investigation showed that the ultimate bearing capacity and settlement of footing generally becomes maximum in terms of efficiency factors (ξγ and ξδ) at a certain critical spacing between the footings. This paper describes some case studies and the potential preventive measures to control the angular distortion of the adjacent building due to construction in neighborhood. 3-Dimensional finite difference is used to investigate some measure numerically
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