The bridge has a double curved concrete deck with the following data:

The given lengths are calculated as arc-length on the floor plan. The 4 piers are located in 20°, 40°x3 and 20° from the

center of alignment as shown above. The approach bridges at the start and end of the 160° bridge are not modelled here.

Figure: Deck in 4-bottom-lines cross section at Section Start.

The 1^st cross section is a normal 4-bottom-lines massive deck having slope 2% and anti-slope 11% at the last 540mm width.

Figure: Deck in 4-bottom-lines in Elevation South.

The double curved alignment is characterized by the West end is 4710mm higher than the East end in this example shown above.

It takes less than a haft of hour to create this bridge for creation of the alignment and the massive 4-bottom-lines.

The piers, foundations and piles are predesigned in ICDAS library and just loaded into any project.

Figure: Deck in 6-bottom-lines cross section at Section Start.

The 2^nd cross section is a 6-bottom-lines massive deck having the top surface as  the 1^st cross section. The thickness

at center raise to 1100mm to obtain the minimum thickness 310mm on the right wing of the cross section.

Figure: Deck in 6-bottom-lines in Elevation South.

The elevation at the West end keeps unchanged 4710mm above the East end so the South view above is updated from 

the 1^st case without any modification.

Figure: Deck box-girder cross section at Section Start.

The 3^nd cross section is a box-girder designed in 1500mm depth from top to bottom surface at center of the box. 

This box-girder has a significant bigger bending and torsional stiffness compared to the two first massive deck.

Figure: Deck box-girder in Elevation South.

The elevation at the West end keeps unchanged 4710mm above the East end so the South view above is updated from the 1^st case without any modification. 

Figure: Massive 4-bottom-lines vs. Massive 6-bottom-lines  vs. Box-girder deck.