Four Comparative Study Of The Crane Specification Structure Fatigue Design

Fatigue failure is a common kind of mechanical parts and structure damage. According to working environment, quayside container cranes always run frequently with heavy load. The parts; of quayside container cranes are easy to damage than other kinds of cranes The question of crane structure fatigue damage is often concerned. The key to improve fatigue strength of crane steel structure is steel structure fatigue design. It is the most effective measure of improving structure fatigue strength and ensuring structure safe working to take reasonable fatigue design methods and to avoid factors of influencing fatigue life in structure details design.Based on analyzing characteristic of fatigue damage, the paper discusses structure fatigue design rules and methods. After that, factors influencing structure fatigue life and measures of designing are studied about common used methods of crane structure fatigue design in present.Hoisting appliances are kinds of important special equipment. Many countries have promulgated their design rules and standards of cranes. Because of some factors, for example the design schedule, designers design cranes just according to the rule offered by the contracts and agreements when they design a crane. By using different kind of crane design rules, the results of design and calculation may be different. This paper selects four rules like the Chinese national standard of Design Rules of CranesGB3811 - 83) the European F.E.M standard ofRules for the Design of Hoisting Appliances) (Rev. Edition 1998.10) , the German standard of Calculation Rules of Cranes Steel Structures (DIN 15018/1 - 1984) and the American national standard of Rules for Construction of Overhead and Gantry Cranes(Top Running Bridge, Multiple Girder(ASME NOG-1-2002). Taking a quayside container crane as an example, this paper calculates its whole process fatigue strength according to the four different rules, and contrasts and analyzes methods of fatigue design calculation of steel structure.In this paper, the construction fatigue calculation makes use of finite element methods of structure. Nodes' stresses of crane structure are given by static element analysis. According to different request of these rules, the paper makes checking programs of fatigue design calculation of steel structure by using FORTRAN calculating language. And it contrasts and analyzes the results of output.As a final conclusion from the example calculations, the standard of ASME NOG-1-2002's result has relative low fatigue strength capacity to steel structure fatigue design of this kind of container crane, and that of F.E.M 1998 has relative high capacity. Those of GB3811 - 83 and DIN 15018/1 -1984 are between that two , and have near results. Because of complicated structures and loads, the task spends much time according to four calculating and designing standards. The distributed pattern of this kind structure fatigue strength given by above calculations, although the paper calculates one example, can help designers to foresee danger areas and take some measures to improve fatigue strength at the beginning of design. It can also shorten period of structure fatigue design. The calculation result of danger areas has some reference value to structure designers.Written by B.Y. Shan (Mechanical Engineering) Directed by Z.H. Wang...