This should be handled as a private message or direct message, but you didn't include a contact e-mail with yesterday's question.
Your message #2 in your posting indicated that you have a student (I am assuming a High Schooler) who is in need of direction regarding supporting long spans for a class assignment. Have your student investigate the following catalog:
This should be able to provide them with suggestions for solving the problem encountered in their school project. It also includes enough calculus to prove to them that Structural Engineering isn't for sissies and can't be supplanted by merely picking items out of a catalog for actual construction projects.
This is for information and educational purposes only! Actual structural design requires hiring a professional - the reason your earlier post was closed.