The Solver Of Bridge Structure Design And Research On Dynamic Reliability Of Crane

Overhead travling crane is one of the most used lifting equipment, at the same time many safety misadventure has happen to it. One of the safty misadventure reason is the metal which is made up of crane exist fatigue. For this reason, it is very important to estimate the metal constructure of crane. To estimate the crane base on the data of stress, data volume is the basis which can impact accuracy of the satety evaluations.It is widely known that reliability is one of key indicators on safety evaluation. For crane metal structure, the traditional structural reliability calculation model is after the stress distribution and force distribution can be got. The Principle of Stress Strength Interference was directly used to calculate the reliability and obtain the structure reliability. But this method structural reliability of the stress cycle only can be calculated once or a specified number cycles. The reliability can't be calculated at any time, and this method didn't take into account the impacted by the strength degradation. So it will not essentially reflect the structural reliability are impacted by stress cycles and duration with stress increasing. However, the crane service time is always very long, and the structure often suffered a lot of repeated random stress cycles, and the affecting factors of the reliability such as stress cycles and the structure strength are often changing over time. In this case, when the reliability of the in service crane structure, it should also be changing over time. In the past, the force cycles time and the structural strength of metal degradation was ignored when the structure reliability had been calculated, it obviously affected the reliability of the crane. This text is based on the actual situation, considering the role of stress cycles and material strength changed over time to calculate the crane structure's dynamic reliability.In this paper, the main component includes:First, it expounded the more data of stress is very important for satety evaluations, so as to the dynamic reliability. Second, according to the running data which has collected form overhead travling crane, use structure mechaniscs to analysis the structure of crane and coding the program to acculate the stress on the crane.Lastly, use of the model of Stress Streng Interference and strength degradation to set up of the dynamic reliability of crane.The plenty of running data of overhead travling crane can be translated to stress; the question of lacking stress data is being solved. A degradation model of dynamic reliability for the crane structures is established. A theoretical foundation on cranes dynamic monitoring and estimating the residual life for the structures have been laid. The research has a great practical in engineering and a significance for making certain maintenance and repairing plan on crane.