Quayside Rods Of Circular Cross-section Straight Rib Suppression Of The Vortex-induced Vibration Simulation

The quayside container crane ,as one kind tall and erect structure, is extremely sensitive to the earthquake and the wind load influence, The quantity of quayside container crane increased, and the height of quayside container crane also highly increased in the recent years. So the wind vibration affects more and more, and the destruction accidents caused by the wind also sometimes occurred. So the wind vibration questions call the designing departments more and more attentions. This dissertation mainly analyzed and researched the harm of vortex vibration in the round cross-section rod of quayside container crane and the necessary to control the transverse wind direction vibration. The current measures of control vibration and the disadvantage of them were listed in this dissertation. We brought forward some measures which will be very useful to control the vortex vibration and had done a lot of experiments. At last, some suggestions for application are brought forward according to the experimental results.The main form of the rod wind vibration in quayside container is transverse wind direction vibration, especially the vortex-induced vibration. This kind of vibration is caused by the alternate shedding vortex behind both sides of the rod when wind blow. Besides, in case the vortex shedding frequency is equal to a inhere frequency of rod, the rod will arises the vortex shedding resonance or called vortex resonance.The resonant velocity of wind has directly relation to the inhere frequency of structure, and the inhere frequency of the round cross section rod is affected by many factors. One of the main factors is the restriction status in two ends of the rod. In this paper, the vibration frequency of round cross section rod in quayside crane and the resonance wind speed in different status were calculated. Including the theory states, the actual states and the states after improvement. Some conclusions were summarized according to the contrast of the vibration frequency and the resonance wind speed in different states. These conclusions can be referred in the design process of quayside crane.In order to control the wind-induced vibration of the round cross-section rod in quayside crane, especially the transverse wind direction resonant vibration, there are many measures to restrain the vibration, the easy way is to assemble some interference fixtures which can break the rule of alternate shedding vortex, then the transverse wind direction vibration force is reduced. By now, there isn't very effective measures were used in the structure design of quayside container crane. Against this situation, the reason which caused the wind vibration in the rod and the main factors were analyzed and researched firstly, and then the wind vibration in the rod was simulated by experiments of different steel tube. In the end, straight interference ribs were selected to do some experiments. These straight interference ribs were drilled some holes and the distance between on every interference ribs is different. These disturbance fixtures are easy to make. The experiments result of different straight interference ribs were contrasted, and the contrast graphs of different situations are provided in this dissertation. At last, some suggestions for application are forwarded according to the experimental results.