DAMA software

The DAMA software was developed by Hwang and Witczak (1979) for the Asphalt Institute and has integrated into the pavement design program of the Asphalt Institute (Asphalt Institute SW-1 2005). 

DAMA software not only calculates stresses, strains and deflections in a multi-layer system with elastic behaviour but also allows the user to analyse the influence of monthly variations in the temperature of the pavement. In the calculation procedures over a period, the mean monthly air temperatures are required as an input. 

Stresses, strains and deflections are calculated at each layer interface and at the pavement surface in three distinct points the centre of one tyre (point 1), the edge of one tyre (point 2) and at the midpoint of the dual wheels (point 3). All of these points lie on the centre-to-centre bisector of the dual wheels. The total number of layers is limited to five. 

DAMA also computes the cumulative pavement damage due to excessive subgrade deformation leading to surface rutting and fatigue cracking of the asphalt-stabilised layer. More details can be found in the SW-1 user s guide (Asphalt Institute SW-1 2005). 

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The thickness of the individual layer is determined from appropriate design charts, developed with the aid of the multi-layered elastic analysis software called DAMA. 

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