- Deepest line elevation, relative elevations, thickness of deck, 3D model, section views
Click on images and click again for 3000 pixels view.
View 1: Bridge alignment, Sections and Views definition, Floor Plans Site View.
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The bridge has an alignment of two circles of radius 30m, View 1. To keep the design simple the bridge is assumed symmetrically in horizontal plan where the angle to true north has been set to zero in Revit Floor Plans Site view in project file.
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The bridge is created in family files then loaded into project file. Having global coordinate of the bridge at the centre point, the user can enter it for Project Base Point in project file to obtain the true location of the bridge, and thereby the true setting outs of geometry.
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View 2: Section 1 at the start of curved stretching of the alignment (input)
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View 3: Section 3 at the centre of curved stretching of the alignment (output)
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View 4: Section 2 at the end of curved stretching of the alignment (input)
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The cross sections of deck are designed at the start
and end of the alignment, called Section 1 and 2,
limiting the stretching of bridge where it is curved.
Once the 3D deck girder is created based on these
two sections and the curved alignment, the user can
automatically create any cross section in between,
here e.g. Section 3 at the centre of the deck girder.
Elevations of the bridge have been set relative to the absolute level, here 20m. Section 1 has the deepest point on the right side top of deck , elevation 1540mm. This elevation becomes on the left side of the Section 2. At the centre of bridge, Section 3, the deepest elevation 1540mm becomes in the middle of the cross section.
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The bottom of deck has a slope of 2.5% as the top of
deck in Section 1 and 2. It yield 102mm above the
absolute level 20m at the highest corner of the bottom.
At the centre of bridge, Section 3, the bottom of deck
becomes horizontally with the mean elevation of 51mm
(=102/2).
The centre boxes of the three cross sections have been designed to keep a constant thickness of 1095mm. The edge beams has an outer thickness of 545mm on the higher side, and 640mm on the lower side of the cross sections, as they are inputted for the Section 1 and 2. As the result, the Section 3 automatically has a mean value of thickness of (545+640)/2=593mm for both of the two edge beams.
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View 5: Elevation view of bridge fromEast
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Elevation East shows the east view of the bridge. Elevation 2019mm is from Section 2, top of the edge beam.
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The bottom of pier is 7000mm below bottom of deck, and the bottom of piles is 19600mm below bottom of deck. All foundations have 600mm thickness. The piles have cross section 250x250mm.
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View 6: Elevation view of bridge from North
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Elevation North shows a view from north side of the bridge.
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Elevations 2019 and 1840 are shown for the Section 2 on the left.
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View 7: 3D view of bridge fromSouth from top
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The 3D South Top shows the bridge from the south side from above.
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The deepest elevations 1540mm on top of deck are highlighted.
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View 8: 3D view of bridge fromSouth from bottom
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The 3D South Bottom shows the bridge from the south side from below.
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Elevation 0 at the bottom of Section 1 turns to be 120mm at the end of Section 2. At the centre of bridge, Section 3, the mean elevation is 51mm.
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View 9: Pier and piles (input)
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The pier is designed in V-shape with two ellipse columns. The ellipse column has the long axes along the foundation at the bottom, but turn to be along the deck on the top. Thus, the upper half of the column has the strong axes against the bending due to load from the deck.
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The piles are designed inclining in both of bridge direction and cross direction. It is needed due to the curved bridge deck, the braking forces, temperature expansions, creep and shrinkages from the concrete deck.
