https://youtu.be/pLELhPSFD6w

https://youtu.be/qWb0KjdznMc

보강판 설계가 귀찮다면?

https://youtu.be/TKg5Cl8uFP0

https://youtu.be/NawPKUDiS-I

https://youtu.be/1IGj9F1hNU8

참고 할만한 자료

ai03's Designer Spreadsheet