Предмет: Алгебра, автор: armanagekyan9

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-2(а-3b)-6(b+2a)

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Автор ответа: julyap

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$-2*(a-3b)-6*(b+2a)=-2a+6b-6b-12a=-2a-12a= \\ =-14a$

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COLUMNS IN WALLS
A common problem in the design of building foundations is a foundation wall that must share its location with a row of columns. This takes place along the exterior walls of buildings with frame structures.
When loads are transferred to the ground there are various possibilities for the relationships between the columns, the wall, and the foundation elements. The column loads may be light, as in the case of a one-storey building with light construction and short spans or the column loads may be large, as in the case of a multi-storey building.
Type of Foundation. If the foundation consists of deep elements, either piers or groups of piles, the wall is usually designed as a spanning element of one type or another. When the foundation is of the shallow bearing type, there may be several possibilities for the column/wall/footing relationships.
EXAMPLE (see fig. 2)
Allowable soil pressure: 3000 psf (150 kPa).
Concrete design strength: 3000 psi (21 MPa).
Allowable tension on reinforcing: 20,000 psi (140 MPa).
FIGURE 2
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