The Research On The Structural Optimization Of All-vertical-piled And Mudsill Wharf

The all-vertical-piled and mudsill wharf is a new type structure.To better realize the economic and social benefits of the terminal,it is necessary to optimize the structure.The method of traditional optimization design lacks the theory to do the guidance,the designer mostly modify the existing structures in accordance with the specification and the experience.Then,calculate the internal force to carry on the strength,the rigidity and the stability check.The "best" program is selected.But this method has some limitations,theoretically the design is conservative.So,the Modern method come into being,it combines structural analysis,computer technology and the mathematical optimization algorithm,turning the passive checking into active design control.The finite element design optimization method is one of them.This paper uses an all-vertical-piled and mudsill wharf as an example,builds the finite element model with ANSYS Parametric Design Language and gets the internal force value of each working condition by the linear elastic method.According to the requirements of the specification and design,the load is combined and it is found that the combined condition is up to 173225.The combination of these conditions is calculated by MATLAB software.Then,the most unfavorable load combination of each component and the corresponding internal force are sorted out.Using this method greatly imoroves the accuracy and efficiency of the calculation.Then,select the former(after)row of piles and other four typical components of the combination of conditions,as the components that need to be optimized.The OPT module of ANSYS is used to optimize the terminal structure,and the optimization method of sub-problem is adopted.Taking the dimension of each component as the design variable and the overall volume of the structure as the objective function,the constraint condition is the princpal stress and the maximum displacement.According to the importance of the components,seven typical components are optimized one by one under the combination of the respective unfavorable loads.The results show that the average optimization degree of the components is about 10%,the volume of the whole structure model is 14%lower than that of the original structure,and the average change rate is about 8%,but both are within the constraint range.This shows that the model does have the optimal space.Moreover,the method for optimizing the design can provide a reference case for similar design of terminal structure.