STABILITY OF RIB-REINORCED CYLINDRICAL SHELLS UNDER WIND LOAD

The nonuniformness of wind load on the surface of shells compilcates the stability study of shells. With the aid of the Trefftz criterions the stability analysis for stiffener-reinforced cylindrical Shells under wind load is conducted. The effects of the stiffener eccentricity is also studied. It is observed that smooth shells is the most vulnerable, and the load-bearing ability of shells with circunferential ribs is better than that of shells with longtudinal stiffeners and the best load-bearing ability is acquired when shells are reinforced with both circumferential ribs and longitudinal stiffeners. It is also found that the load-bearing ability is in descending sequence for shells with outer ribs, shells with inner ribs and shells with central ribs on the shell skin