The algorithm for solving the problem of accounting work of system “foundations-load-bearing floor” with phased modeling in modern CAD

For buildings, that have shallow Foundations under columns and Load-bearing floor the mutual influence of these structures on each other is characteristic. The Foundations of the frame are forced to perceive additional loads from Load-bearing floor. Load-bearing floor gets non-uniform deformation, occurring from the supporting influence of Foundations. This leads to a change in the character of distribution of internal bending moments in the Load-bearing floor. To take into account such a complex mutual influence of these constructions in the one calculation model is difficult. To solve the problem, it is suggested to use a special algorithm. An algorithm for a phased solution to the problem of calculating the system “Foundations – Load-bearing floor” is suggested. It allows to take into account the features of the real work of constructions. The case of shallow Foundations and a Load-bearing floor is considered. In this case plate loads the Foundations, and Foundations limit plate displacements. The problem was solved by computer modeling of the system deformation process “Foundations – Load-bearing floor”. The plate of the Load-bearing floor is considered as a plate on elastic foundation with a restriction of deformation in places where pad foundation under a column are connected. The influence of Foundations on the Load-bearing floor displacements restriction was modeled by connection of the final stiffness. The problem is formulated as linear. The task solving was made in program complex “Lira”.