Dynamic Response Analysis Of Drift Ice Impacting Radical Gate

The Yellow River in Ningxia and Neimenggu is 1,140 kilometers long,which develops from the low latitude to the high latitude,and whose flow potential conditions has been varied changeably.So ice flow is not stable during the ice flood season annually,and ice disaster occurs frequently.Embankments along the river,channels,bridges,culverts,sluices,irrigation and drainage pumping station,railway bridges and other hydraulic structures and road engineering facilities are all within the scope of ice flood disaster-prone area.The radial gate is worth studying for the reason that its spatial beam frames behavior will be varied by the outer load.Based on the commercial finite element software ANSYS/LSDYNA,Pre-processing software Hypermesh,and Post-processing software LS-PrePost software,etc.,combined with a certain radial steel gate as the research object,which is located in the upper reaches of the Yellow River in Ningxia and Neimenggu and frequently encounters ice run in winner,this article analyzes the mechanical characteristics and work way of the radial gate,establishes reasonable three-dimensional finite element model of radial gate.,and studies the dynamical response under the impact of massive ice.The content includes the following aspects:Firstly according to the mechanical characteristics and work way of radial gate,the element types that can reflect the actual working state of each radial gate component are confirmed,which establishes simplified three-dimensional finite element model of radial gate.Secondly using the model,this paper analyzes concretely energy process of flow ice,ice dynamical process,energy process of radial gate and the changing process of the key nodes displacement in the process of ice impacting radial gate at the size of 100cm×100cm×50cm and speed 2m/s.And then it compares ice force values under different ice loading condition and at different speed.Under water pressure load,it compares vibration response such as total displacement and effective stress at different impact angle,different impact location points in the different height and different horizontal position by the worst ice load condition for the radial gate,the size of 200cm×200cm×50cm and speed 2m/s.Meanwhile,it summarizes some rules and establishes numerical simulation method of the ice impacting radial gate under water pressure load is confirmed.Lastly,the stress and deformation law of the main components of the gate(gate page,main beam and longitudinal beam)under the impact load of flow ice are analyzed in detail,and the strength and stiffness of the radial gate are checked,in order that the stress and deformation of the gate can be controlled.