ABSTRACT

With the increase in population growth, urbanization is increasing too. that leads to the traffic as well as parking issues especially in metropolitan cities like Karachi. London and Shanghai etc.To accommodate parking issue for the vehicles mainly in urban areas, basements (i.e. excavation) under or nearby high rise buildings are preferred. In the result of excavation, ground movements occur that have major
impact on structures. buildings and utilities etc.Past research usually oversimplified surface structure as an equivalent elastic beam which is unable to represent behaviour of a framed building realistically. in this study, the detrimental effects on n two
storey RCC framed building (ground & first floor) founded on piles due to an adjacent excavation-induced ground movement were determined. Elasto-plastic
coupled-consolidation analysis was adopted. An advanced constitutive model was med to capture soil behaviour. This model has ability to capture the unique features of soil which are non-linear, degradation of stiffness (with stress, strain & path
) and stress-strain dependent dilatancy of soil. The concrete damaged plasticity (CDP) model was used to capture cracking behaviour in the concrete beams, columns and piles. It was revealed that significant differential settlement was observed in the building on completion of the excavation. As a result of the
settlement, the slope (maximum of 0.2%) and tilting (maximum of 16%) were induced in the two storeys framed building. The induced slope and tilting are not equa and resulting in the distortion of the frame of the building. As a
the tension cracks are indeed at the Inner side of the column. The detrimental effect of excavation on the frame can be minmized by increasing thickness of the wall