Studies On Portal Crane Life Assessment Method Based On Stress Analysis

Portal cran in port economic construction plays a very important role, but as a result of ambient conditions, the portal cran is easy to corrosion, plus homework frequent, fatigue damage phenomenon is very common, every movement of the metal structure parts, as long as it under repeated load effect, could happen crack initiation, expand, and cause sudden fracture of the fatigue and cracks, the domestic ports each year because of hoisting equipment operation caused a lot of damage to property and injury accident, research and prevent the happening of the accident to the production safety of the social importance.《Regulation for periodicity inspection of lifting appliances》TSG Q7015-2008 in article 14 states: to use time more than 15 years, in severely corrosive environment (such as the sea, wet area, etc.) or high winds, high frequency of use area large hoisting machinery shall, according to the specific situation has pointed increase other inspection means and, when necessary, according to large hoisting machinery actual security and use the unit the level of safety management ability, security assessment.According to the portal cran metal structure of the main failure modes: fatigue fracture, The author will local port a useful life of more than 15 years of portal cran as research object, by the Miner fatigue damage cumulative theory and rain flow count method as the theoretical basis, and the dynamic stress analyzer and static stress analyzer acquisition under various working conditions and make the use stress of portal cran design parameters and a working days of the actual working parameters, control the fatigue parameters is derived and eventually fatigue residual life calculation formula for the portal cran fatigue residual life to provide feasible evaluation method and means, to estimate accurately portal cran fatigue residual life provide scientific data.The research results can accurately estimate the relative content of departure crane remaining life, to reduce the portal cran fatigue damage accidents, and guide the crane of design, manufacturing and special equipment inspection analysis has an important meaning, and the special equipment for the field detection provide new effective methods, and to establish China's special equipment safety provide technical support for the dynamic regulatory mechanism, to ensure the rational utilization of portal cran and guide the safe running of the equipment has the important meaning.