hello can you send me the arch bridge file and guide if possible? thank you
For an Arch check the Wiki below.
You can also use as reference the dataset and documentation you can find at File\Examples\Verification Examples and FAQ\ Modeler Link Segments & Truss Modeling as shown in the image and explained in the Wiki link below.
An arch would use the same concept of creating different independent Parts in the Cross-section and making the distance between them a variable.