Specification of emergency loads structure of head-frames
Abstract: On the basis of generalization of the results of mathematical modeling of the dynamic behaviour of the mechanical system «head-frame structures – a winder» a specification of special loads structure has been done. For head-frames structures equipped with winders which have technical characteristics causing a possibility of a hoisting rope breaking on jamming a rising vessel, design values of special loads being determined by a maximum value of the amplitude of a total hoisting rope tension which is determined by a critical value of the length of the hoisting rope jammed branch at a given speed of a winder movement. For the structures of cage winding head-frames, at a hoisting rope breaking as a result of jamming a rising vessel, the effort in an adjacent branch can keep on increasing and reach a peak value at the moment of a dog response. As a result of this when determining a special load because of a dog response, besides the efforts in brake ropes one should take into account a peak value of the effort in a hoisting rope adjacent branch. For the structures of skip hoisting and cage winding head-frames which are not equipped with a dog and for which a hoisting rope breaking it is not possible, one should consider a possibility of breaking a hoisting rope as a result of a rising vessel hanging-up at the level of discharges.
Keywords: head-frame, emergency loads, building structure designs.
Pages: 53-66.
For citation: Kuschenko, V. M.; Mykhailov, O. V. Specification of emergency loads structure of head-frames. – Text : electronic. – In: Metal Constructions. – 2008. – Vol. 14, N 1. – Р. 53-66. – URL: https://donnasa.ru/publish_house/journals/mk/2008-1/05_kuschenko_mihajlov.pdf (date of access: 21.11.2024). – ISSN 1993-3517.
Vol. 14, N 1 (2008)
Journal: Metal Constructions
Publish house: Donbas National Academy of Civil Engineering and Architecture
Journal: Metal Constructions
Publish house: Donbas National Academy of Civil Engineering and Architecture