An experimental determination of the remaining strength of glued-in bolts after 9 years is presented. The hollow tapered bolts served as the blade to rotor hub connection of a windmill with wooden blades. The test method is presented along with the load history of the bolts, the recorded residual strength, the observed fracture modes and the force displacements curves. A total of 11 bolts were pulled out between undamaged bolts. The mean strength was found to be 362 kN with a standard deviation of 37 kN. This residual strength is 95% of previously recorded data. At fracture, a displacement between 0.4 mm and 1.0 mm was observed. In the majority of failures the bolts were pulled out like a cork from a bottle. A FEM-analysis confirms the higher load bearing capacity of the special hollowed tapered bolts compared to solid bolts.
|Title of host publication||Proceedings of the International Wood Engineering Conference, Volume 4|
|Place of Publication||Madison|
|Publication status||Published - 1996|
|Event||International Wood Engineering Conference - New Orleans|
Duration: 1 Jan 1996 → …
|Conference||International Wood Engineering Conference|
|Period||01/01/1996 → …|