Optimization in Selecting the Construction Projects of Large-span Steel Truss Based on Extension Theory

摘要

Large-span steel trusses have been widely used in spatial structures. With the development of technology, more newrnconstruction techniques in this field have emerged. The determination of construction methods will be important tornlimit the cost of structural construction, and will be influential on the construction progress and quality of thernstructure. So how to make a good choice of construction methods has been paid more attention in this field.rnOn the basis of System Engineering Theory and detailed analysis of economic and technique index of large-spanrnsteel truss structures, and using analytical hierarchy process method, the current paper establishes the Engineeringrnindex system of construction methods for the same type buildings. In addition, according to thernextension-mathematics principles, multi-layer Complex Extension-mathematics Judgment Model is built and thernweight coefficient of each index is calculated using the analytical hierarchy process method. By the ExpertrnInvestigation Method, each index judgment matrix is built, and the multi-layered extension combination judgment isrncarried out. At last, the final objective of optimization in selecting the construction scheme of large-span steel truss isrnobtained.rnThe analysis of real construction project shows that this model has high efficiency and practicability in choosing thernconstruction method of large-span steel truss buildings. The index of this model is easy to be dealt with, and thernresult of the model analysis has good agreement with the real engineering. This study provides the effective tools forrnthe construction optimization of large-span steel trusses and will improve construction quality, speed up constructionrnprogress, and minimize of the project expenditure, and so on.