Calculation of Local Stability of 3 000 t·h-1 Bridge Grab Ship Unloader Structure
The stability is the premise of the normal operation of the structure.Taking the 3 000 t·h-1 bridge grab ship unloader as the analysis object,the local stability is calculated by theoretical calculation method.The ship unloader is mainly composed of boom,tower leg and portal leg.The local stability of these three parts directly determines the stability of the whole ship unloader,so it is necessary to calculate its cover plate and web plate.First of all,the upper plate stress,lower plate stress,plate shear stress and composite stress are calculated according to the load and shell parameters of the structure,and then the equivalent critical compressive stress and equivalent critical composite stress of the material are calculated,and then the material utilization rate of each structure plate is obtained.Finally,the calculation results are evaluated by the crane design code.The results show that the maximum edge stress and composite stress on the plate are 158 MPa and 166.32 MPa respectively,and the equivalent critical compressive stress is 211.77 MPa and the equivalent critical composite stress is 188.36 MPa.The maximum utilization rate of the material is 0.88,which meets the requirements of the specification.This calculation method can provide basic data for the design and optimization of ship unloader,and can also provide a certain reference for the stability analysis of ship unloader and similar structural parts.
bridge type grab ship unloaderlocal stabilitymaterial utilization rate
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万方数据
