Tubular Piles – Buckling Design in a Complex Situation

Buckling of long steel cylindrical shells subjected to external pressure

“…Deriving the critical buckling stress according to EN 1993-1-6 [1] for an infinite cylinder results in nearly the same value. For uniform pressure on a long cylinder (24 m for a tubular pile; [18]) the ideal buckling stress differs only slightly from the previous cases. This aspect confirms that the shell-buckling behaviour for long cylinders is rather a ring-buckling…”

“…The comparison is based on ring or cylinder with a radius r ¼ 900 mm and r/t ¼ 50. The geometry of the long cylinder is chosen in accordance with tubular piles as described in [18]. For a circular ring subjected to a uniform pressure p an analytical solution (cfr.…”

“…As the first factor is fix for steel constructions (E and m) a range can be determined for s cr with r/t450 and steel grades with f y X240 N/mm 2 [18]. The equivalent slenderness parameterl K is calculated for different r/t ratios and materials according to Eqs.…”

Experimental Investigation on Buckling Behavior of soil‐embedded Piles

“…A special feature of the setup was the ability to vary the stress state (and thus the stiffness) of the soil in a controlled manner by means of airtight hoses wrapped along the inner wall of the soil container. This allowed the application of lateral pressure to the soil body, as already demonstrated in [10]. In the same vein, the top surface of the soil was covered with semi-circular pneumatic pillows and a stiffened lid to allow for application of vertical pressure on the soil body.…”

“…Other studies have been conducted in the field of aerospace research, aiming at design improvements of solid fuel rockets or on silo structures considering effects of an inner filling (see e.g. the comprehensive literature review provided in [9]). More recent insights can be found in the works of Hübner [9] and Winkel [14].…”