Chainage Alignments and Profile Control Curves

Horizontal Control Chainage Alignments

1. The system allows the definition of main chainage alignments and ramps consisting of one or more contiguous segments of straight, simple spiral, compound spiral or circular curves. Alignments could be defined w.r.t the global co-ordinate system or to its own local system.
2. For intersecting alignments, the system computes and displays the intersection points and their attributes such as Northern and Eastern co-ordinates, station, azimuth and ground elevation.
3. The system allows the user many options to print and view graphically or in table any number of selected alignments and identifies the characteristics of key points between segments as well as many number of points at regular intervals along the alignment.
   The system also allows for alignment curves to be projected over any selected ground terrain contour plate.
4. Using the point definition feature, the user could request to compute the co-ordinates of sets of points that are offset in any direction from any point on an alignment.

Vertical Profile Curves

The system allows the definition of two types of vertical profile curves :

1. Curves defined by multi-segments of (straight - parabola - straight)

2. Spline curve obtained by fitting polynomial curve between arbitrary set of points.

The system computes and allows printing and viewing the ground elevation within the domain of the profile control. This allows the engineer to fine tune the the preliminary bridge design by investigating the effect of road elevation and span layout on the height of abutments and piers as well as on foundation elevation, etc.