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(蘭州理工大學(xué)土木工程學(xué)院， 蘭州 730050)
摘要: 張弦桁架設(shè)計(jì)參數(shù)較多且相互影響，常伴有較大的幾何非線性變形，因此需要精確尋找結(jié)構(gòu)形狀及預(yù)拉力，以獲得結(jié)構(gòu)整體性能的優(yōu)化結(jié)果。 在 MATLAB 平臺上利用多種群遺傳算法，通過命令流調(diào)用 SAP2000，在對結(jié)構(gòu)優(yōu)化的同時(shí)，實(shí)現(xiàn)“找形”及“找力”；第一階段尋找各類構(gòu)件的截面，發(fā)現(xiàn)桁架弦桿截面的改變對整體優(yōu)化結(jié)果影響較小，在此基礎(chǔ)上進(jìn)行第二階段結(jié)構(gòu)整體優(yōu)化。 通過對 10 組模型優(yōu)化，發(fā)現(xiàn)最優(yōu)矢高、垂度、桁架上弦截面高度、初始預(yù)拉力與跨度呈顯著線性上升變化，腹桿間距基本保持不變，而撐桿數(shù)目則在 6~ 13 范圍內(nèi)變化；通過分析得到各最優(yōu)設(shè)計(jì)參數(shù)與跨度的方程，發(fā)現(xiàn)變化范圍越大的參數(shù)線性程度越高，說明該方法可用于一般張弦桁架的優(yōu)化。
關(guān)鍵詞: 張弦桁架；多種群遺傳算法；選形優(yōu)化
中圖分類號:TU323. 4 文獻(xiàn)標(biāo)志碼:A 文章編號:1002￣848X(2022)01￣0056￣07
DOI:10. 19701 / j. jzjg. 20200322
Design and shape selection optimization of truss string structures based on genetic algorithm
SUN Yanping， SUN Yuping
(School of Civil Engineering， Lanzhou University of Technology， Lanzhou 730050， China)
Abstract: The design parameters of the truss string structure are many and influence each other， often accompanied bylarge geometric nonlinear deformation， so it is necessary to accurately find the structure shape and pretension to obtain theoptimization results of the overall performance of the structure. On the MATLAB platform， the multi population geneticalgorithm called SAP2000 was used through the command flow， while optimizing the structure， achieved " shape finding"and " force finding" . In the first stage， the section of various components was searched， and it was found that the change ofcomponents section of truss chord has little influence on the overall optimization results. On this basis， the second stage wasoptimized of overall structure. Through the optimization of 10 groups of models， it was found that the optimal rise， sag，height of upper truss chord section of truss， initial pretension and span show obvious linear upward change；the distancebetween web members is basically constant and the number of strut varies from 6 to 13. The equations of the optimal designparameters and span were obtained by analysis. It was found that the larger the variation range， the higher the linearity ofthe parameters， which shows that the method can be used for the optimization of general truss string structure.
Keywords:truss string；multi population genetic algorithm；shape selection optimization
第一作者:孫彥平，碩士研究生，主要從事預(yù)應(yīng)力鋼結(jié)構(gòu)研究，Email:syp4055@ 163. com。
[引用本文] 孫彥平，孫玉萍. 基于遺傳算法的張弦桁架設(shè)計(jì)與選形優(yōu)化[J]. 建筑結(jié)構(gòu)，2021，52(1):56￣62. SUNYanping，SUN Yuping. Design and shape selection optimization of truss string structures based on genetic algorithm[ J].Building Structure，2022，52(1):56￣62.
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