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GEO5

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Wings

The frame "Wings" allows for inputting the bridge wings dimensions. The wings can be either symmetrical or unsymmetrical. Assuming unsymmetrical wings requires inputting the right and left wing dimensions separately. The screen always displays the currently input wing - only the left wing is then visualized in the remaining frames.

The frame "Geometry plane view" can also be used to input or edit the wing thicknesses and lengths.

The Wing-abutment joint cross-section can also be verified in the frame "Dimensioning". The load due to moment is considered. The whole wing is loaded by active pressure developed behind the wall. The "Dimensioning" dialog window serves to input the magnitude of surface surcharge to determine the wing pressure. The surcharge specified in the frame "Surcharge" is then not taken into account and the terrain behind the wing is considered as flat. The resulting moment applied to the joint is obtained by multiplying the overall magnitude of soil pressure acting on the wall surface and by the difference of centroids of the pressure resultant and the joint.  

The length of cross-section used for dimensioning is considered by default as the wing height - a different length of wing-abutment joint can also be specified after selecting the option "Reduce for dimensioning".

When using prolonged wing walls it is possible to input dimensions of the foundation below the wall. Such foundation jumps are reflected in the analysis by computing a fictitious width of the foundation as:

where:

Atot

-

overall area of foundation including all jumps

S

-

length of abutment foundation

dfict

-

fictitious width of foundation for verification analysis

The foundation is then considered as being rectangular, which is simplified but rather conservative assumption.

Frame "Wings"