| 摘要 |
Hollow pole construction for the raising of post constructions, guard rails, separating constructions or the like, utilized in connection with arterial traffic, arranged to have significant static strength and rigidity during normal use, while being flexible and energy absorbing when the construction is exposed to local, transverse loads. When subjected to a blow-like impact, the pipe wall of the pole construction will collapse and a "wave of collapse" is generated, propagating easily in the longitudinal directions of the pole construction. The wave of collapse leaves a flattened cross-sectional profile that will bend easily around a car, for example. A particular combination of material properties and geometrical shapes for the cross-section of the pole is applied, in that the thickness of the pipe wall remains in the range of [formel 1], where the unit for the thickness, t, and diameter, D, is millimeter and the unit for the yield stress for the material is N/mm<SUP>2</SUP>, while the diameter, D, to thickness, t, ratio remains in the range of [formel 2], E being the modulus of elastiticity (Young's modulus) and having the same unit as the yield stress, s<SUB>0</SUB>, of the material. |
