Truss Structure Route Optimization Analysis

Construction process planning of structures has an influence upon the cost of the construction, the internal force of the structure, the safety during the construction course etc. So it is very important to find the optimal construction planning. It is a new topic in structure optimization relating to construction mechanics. Construction process is often planned by trial on the basis of previous experience. The work is very tough and could not always give an optimal answer. In this study, our objective is to search for the optimal construction process by a numerical analysis.This paper sums up research in construction planning of structures. An inverse analysis for construction planning by removing members is introduced in order to find an optimum solution of the construction process satisfying given criteria. By studying the mechanical phenomena of structures' inner parameters varying with time, the optimal construction planning is gained with computer-supported. The corresponding program is applied in several plane truss structures and developed to analyze space truss structures.An optimizing method based on biological evolution-Genetic Algorithm is proposed to the problem of the construction process planning analysis. Adapting the successful experience of path optimization problem, improved genetic operators are adopted: The sequence of numbers, which is arranged by the removal order of members, is assumed to represent a chromosome by natural code; transforming baseline information of this problem into immune operators; combining rank-based model with elitist model; designing special crossover and mutation operators. The mathematical model for computer and special programs are provided in this paper. Based on these improvements, numerical examples are given to show the reliability and efficiency of genetic algorithm in these problems.