發(fā)布時(shí)間：2018-06-28 16:00

  本文選題：輪輻式 + 懸索結(jié)構(gòu)�。� 參考：《東南大學(xué)》2015年碩士論文

【摘要】：本文對(duì)鞍形輪輻式單層懸索結(jié)構(gòu)的初始形態(tài)進(jìn)行了優(yōu)化研究。在懸索結(jié)構(gòu)中,拉索必須保持受拉；結(jié)構(gòu)本身不具各幾何剛度。需要找到特定的預(yù)應(yīng)力分布才能維持幾何位形：且具有多設(shè)計(jì)參數(shù)、目標(biāo)函數(shù)無(wú)法形成顯式函數(shù)的特點(diǎn)。經(jīng)過(guò)廣泛對(duì)比,本文選取遺傳算法作為主要研究方法。本文對(duì)介紹了自適應(yīng)全局優(yōu)化概率搜索算法——遺傳算法,對(duì)遺傳算法的基本組成部分進(jìn)行了詳細(xì)闡述；針對(duì)懸索結(jié)構(gòu)的特點(diǎn),本文設(shè)計(jì)了采用改進(jìn)并行策略和最佳保留策略的遺傳算法。為了更高效地使用遺傳算法實(shí)現(xiàn)結(jié)構(gòu)優(yōu)化,本文使用(?) 1ATLAB調(diào)用ANSYS進(jìn)行遺傳操作,解決了兩種軟件信息交換的關(guān)鍵問(wèn)題,編制了相應(yīng)程序,并采用十桿平面桁架算例驗(yàn)證了計(jì)算流程的可行性。本文建立了采用改進(jìn)的遺傳算法對(duì)輪幅式單層索網(wǎng)進(jìn)行初始形態(tài)優(yōu)化研究的流程,并選擇了合適的遺傳操作算子。本文建立了索網(wǎng)的簡(jiǎn)化模型,確定了以最小投資為優(yōu)化目標(biāo),以結(jié)構(gòu)形態(tài)、拉索截面和索網(wǎng)初始預(yù)應(yīng)力為優(yōu)化變量,并對(duì)優(yōu)化變量進(jìn)行了合理簡(jiǎn)化,提高優(yōu)化效率。本文對(duì)輪幅式單層索網(wǎng)的初始形態(tài)特性進(jìn)行了研究,根據(jù)“共節(jié)點(diǎn)的三根索共面”這一原則,設(shè)計(jì)了此種索網(wǎng)的幾何初始位形創(chuàng)建方法,減少了變量數(shù)目。另外,本文采用迭代法確定索網(wǎng)初始預(yù)應(yīng)力比例,并編制了相關(guān)程序。根據(jù)輪輻式單層索網(wǎng)優(yōu)化流程,本文對(duì)多個(gè)懸索結(jié)構(gòu)算例進(jìn)行了優(yōu)化研究,驗(yàn)證了采用遺傳算法對(duì)輪幅式單層索網(wǎng)初始形態(tài)進(jìn)行優(yōu)化的可行性。本文對(duì)蘇州工業(yè)園體育場(chǎng)索網(wǎng)的計(jì)算模型和荷載工況進(jìn)行了合理簡(jiǎn)化,采用改進(jìn)的遺傳算法對(duì)蘇州工業(yè)園體育場(chǎng)索網(wǎng)進(jìn)行初始形態(tài)優(yōu)化,并對(duì)輪輻式單層索網(wǎng)的特點(diǎn)進(jìn)行了總結(jié)。另外,本文對(duì)支座標(biāo)高流暢變化的模型進(jìn)行優(yōu)化,并與原優(yōu)化結(jié)果進(jìn)行對(duì)比,得出索網(wǎng)高差和索網(wǎng)的初始預(yù)應(yīng)力水平對(duì)索網(wǎng)用鋼量影響較大；支座節(jié)點(diǎn)坐標(biāo)對(duì)索網(wǎng)用鋼量影響較小的結(jié)論。本文指出可以根據(jù)建筑美觀性確定支座的位置,再將初始預(yù)張力基值HC以及預(yù)張力調(diào)整系數(shù)μ作為優(yōu)化變量,尋找合理的初始預(yù)應(yīng)力水平。
[Abstract]:In this paper, the initial shape of saddle-spoke single-layer suspension structure is studied. In suspension structures, cables must be kept in tension; the structure itself does not have any geometric stiffness. It is necessary to find a specific distribution of prestress to maintain the geometric configuration. Moreover, the objective function can not form an explicit function because it has many design parameters. After extensive comparison, this paper selects genetic algorithm as the main research method. In this paper, the adaptive global optimization probabilistic search algorithm, genetic algorithm, is introduced, and the basic components of genetic algorithm are described in detail. In this paper, a genetic algorithm based on improved parallel strategy and optimal retention strategy is designed. In order to use genetic algorithm to realize structure optimization more efficiently, this paper uses (?) 1MATLAB to call ANSYS for genetic operation, solves the key problem of two kinds of software information exchange, and compiles the corresponding program. A ten-bar plane truss example is used to verify the feasibility of the calculation process. In this paper, an improved genetic algorithm (GA) is used to study the initial shape optimization of a single-layer cable network with wheel amplitude, and a suitable genetic operator is selected. In this paper, the simplified model of cable network is established, and the optimization objective is the minimum investment, and the structural shape, cable section and initial prestress of cable net are taken as the optimization variables, and the optimization variables are reasonably simplified to improve the optimization efficiency. In this paper, the initial morphological characteristics of single-layer cable-net with wheel width are studied. According to the principle of "three cable coplanar of common node", the geometric initial configuration of this cable-net is designed, and the number of variables is reduced. In addition, the initial prestress ratio of cable net is determined by iterative method, and the relevant program is worked out. According to the optimization flow of spoke single layer cable network, this paper studies the optimization of several suspension cable structure examples, and verifies the feasibility of genetic algorithm to optimize the initial shape of wheel amplitude single layer cable net. In this paper, the calculation model and load condition of cable network of Suzhou Industrial Park Stadium are reasonably simplified, and the initial shape of cable network of Suzhou Industrial Park Stadium is optimized by improved genetic algorithm. The characteristics of spoke single layer cable net are summarized. In addition, this paper optimizes the model of the smooth change of bearing height, and compares with the original optimization results, and draws the conclusion that the difference of cable network height and the initial prestress level of cable net have great influence on the amount of steel used in cable network. The conclusion that the coordinate of support node has little influence on the amount of steel used in cable network. In this paper, it is pointed out that the position of the bearing can be determined according to the aesthetics of the building, and the initial pretension base value HC and the pretension adjustment coefficient 渭 can be taken as the optimization variables to find the reasonable initial prestress level.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU399

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本文編號(hào)：2078551