DIFFERENTIAL SETTLEMENT OF BUILDINGS

The discusser describes experience with the interpretation methodology of the differential settlements while analyzing the settlement records of some apartment buildings (5 floors; and 10-11 floors). The foundation ground consists of partially compacted collapsible loessial soils, highly deformable when wetted. Systematic long-term settlement records are available - but only on the corners of the buildings. In the anlaysis procedure, differential settlement was expressed through the tilt, unit torsion, and minimum versus maximum settlement ratio of building at different time intevals. For the 5-storey building, it was possible to delimit the area, into which, with a 90 percent probability, the building deformations do not cause damage. It is emphasized that such recommendations are valid only for similar buildings and structures; for instance, higher but more rigid structures underwent some tilts up to 8 percent without structural, architectural or functional damages. A better prognosis of differential settlements was considered, therefore, as more efficient in view of a more appropriate calculation of the resistance of the structure. The statistical processing of differential settlement records was adopted. The dependence between differential and maximum settlements was established for different levels of frequency and 90 percent level was finally adopted. The probable differential settlement for the 5-story building is tabulated. For the 10 or 11 story buildings, the predicted maximum tilt does not exceed 5 percent and the maximum settlement is not more than 30 cm.

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Filing Info

  • Accession Number: 00127110
  • Record Type: Publication
  • Report/Paper Numbers: ASCE #11534 Proceeding
  • Files: TRIS
  • Created Date: Dec 29 1975 12:00AM