8Verein Deutscher Ingenieure. VDI 2230 Part 1, System- atic Calculation of High Duty Bolted Joints, Joints with One Cylindrical Bolt[S]. Dtsseldorf: Verein Deutscher Ingenieure, 2003.
9Germanischer Lloyd. Rules and Regulations IV - Industrial Services, Part 1 - Guideline for Certifica- tion of Wind Turbines [M]. Hamberg: Germanis- cher Lloyd, 2010.
10Warren Y, Richard B. Roarks Formulas for Stress and Strain[M]. New York: McGraw Hill Profes- sional, 2001.
