The foundation subsidence of the tower-type structures

The roll of a building is the deviation of the building from the vertical. As a rule, the roll is determined for high-rise buildings, the height of which significantly exceeds the base. The building roll occurs due to the foundation subsidence, thermal deformation, ageing of structures, wind loads, etc. Unacceptable rolls of buildings lead to their destruction, as well as to the decommissioning. The issue of building roll control has been of concern to specialists since ancient times. An example of the roll of ancient buildings is the Leaning Tower of Pisa. Rising prices of land plots lead to an increase in high-rise construction. They can form entire residential quarters. Therefore, the control of such structures verticality is of particular relevance. For this purpose their rolls are determined. Various methods of geodetic measurements as well as devices have been developed to determine the building roll. DBN B.1.3-2:2010 regulates a permissible error of determining the even foundation subsidence of the tower-type structures. However, there is no clear specification of the necessary accuracy of their lopsided subsidence. To solve this problem we propose the following approach. Summing up it should be noted that the general and partial formulas for determining the amount of roll and its direction are obtained (the values of the marks set in the basis of the circular tower structure are used). Having the roll value and its direction, determined by the subsidence, it is possible to find out the impact of vertical drift of foundation on the roll of the whole building. The suggested approach can be used for tower structures with foundations of various geometric shapes.