Concrete box girder bridge, loft along curve inconsistencies

Grasshopper
1

Hi I’m looking to get advice for the best way to develop the curves generated for a concrete box.

1. Two curves have been generated to define the internal and external surfaces of the box. These have been brought together as a boundary surface for actual box section.

2. Provided a Rhino8 file with a 300m curve

3. There might be some errors as I’ve generated some text and dimensioning reading in an excel sheet dimensions also attached

4. Geometry has been generated for the box in the YZ plane

5. Only used the outer curve to loft

What is the best way to loft or extrude the box section along a curve

Not quite what I expected, its been a while and I’m rusty. I did not upload the excel data due to restrictions, but that was used for a dimensioning exercise so hopefully not required

many thanks

Kenyon

Canvas at 18;16;24
Canvas at 18;16;241916×861 53 KB

Box_GH_Rev_A.gh (42.8 KB)

R8_400m_curve.3dm (43.1 KB)

2

Here is one solution. I used the orient to locate the outer and inner box shapes to your curve geometry. After that I used the loft and subtracted the inner volume from the outer. There are many other methods. This will only work here because your curve has no elevation. This would not work if you had superelevation.

Box_GH_Rev_A-brad.gh (47.1 KB)

image
image1015×534 19.8 KB

3

Hi Brad, many thanks for your response I looked at your definition and I was able to amend based on the aspects you mentioned. My orient was lacking some definition, once I resolved that I was able to generate the box.

Thanks

Kenyon

Box_GH_Rev_B.gh (48.7 KB)

4

No problem. If this is a real world project please let us know how you use GH. I am always interested to see how other engineers are using this.