[MIDAS로 배우는 구조역학] 18장 기하비선형 해석 Geometric Nonlinear
• YouTube: 
https://www.youtube.com/watch?v=_qqMW8d-8UI&list=PLXMmPDu5-PnfaY2KqGNHYeIbZ4AMntpO1&index=18
• PDF: 
https://www.dropbox.com/s/6bcfocohd47svof/04_18%20Geometric%20Nonlinear.pdf?dl=0