Research On Structure Optimization Of Overhead Vertical Wharf In River Under Earthquake

Based on static and dynamics analysis, an analysis of anti-seismic optimizationdesign combined with a certain inland river overhead vertical wharf engineering projectwas conducted by using ANSYS finite element analysis software and genetic algorithmin this paper. The main contents and conclusions are as follows:1．Orthogonal design, condition amplification factors and vibration mode judgmentfactors were adopted to analyse and to evaluate the the effects of the variations ofstructural optimization design variables on the most unfavorable conditions, thevibration modes and so on in this paper. The following conclusions are got throughcalculation and analysis: the effects of variations of structural optimization designvariables on the most unfavorable conditions and the first order to the ninth ordervibration modes are small; six order vibration modes are needed to calculate to meet thecode requirements for seismic design of engineering.2. Calculation and analysis show that optimization of which population size,crossover rate and mutation rate respectively are30,0.5and0.05is of good effects andof stable convergence. The following conclusions are got through range analysis: effectsof mutation rate on the optimization effects and the convergence of algorithm is biggest,next is population size and the minimal is crossover rate.3. The elite genetic algorithm with finite element method was used to solve theoptimization design of overhead vertical wharf. An anti-seismic optimizationmathematical model of which optimization goal and termination conditions respectivelywere minimum total volume and iterative maximum numbers was established forgenetic optimization calculation. The bearing capacity of the structure and components,the normal requirements and structural requirements were its constraints and theyshould meet the codes’ requirements. Comparison and analysis before and afteroptimization were conducted. The total volume can be reduced by17.97%incompliance with earthquake and the constraints and20generation iteration results canachieve obvious optimization effects.