The Beam Project Description describes the concepts that you need to research. The Beam Design Package explains the types of sources that are acceptable for this project.
Use the ASTM Digital Library to find standards that you can use to evaluate the performance of your beam. you can search by keyword to find relevant standards, or look them up by designation if you know of one that will be useful (try D3737 to see how this works).
Journal articles and technical reports will give in-depth information on specific research that is related to your topic.
Use these databases to search for journal articles you can use to support your project research.