發(fā)布時間：2018-05-27 21:52

  本文選題：弦支穹頂結構 + 預應力比�。� 參考：《廣州大學》2017年碩士論文

【摘要】：弦支穹頂是由單層網(wǎng)殼和索-撐體系組合而成的輕度預應力大跨空間結構,其受力性能好、跨越空間距離大、造型優(yōu)美;目前已廣泛用于航站樓、體育場館、會展中心等大型公共設施屋蓋中,如2008年北京奧運會羽毛球館、濟南奧體中心體育館等屋蓋結構均為這種結構體系。弦支穹頂結構設計的核心就是確定最佳環(huán)索預應力;過大或過小的環(huán)索預應力,都將嚴重影響結構的受力性能及結構耗鋼量等方面。為了確定弦支穹頂結構最優(yōu)的預應力設計方案,本文選取幾何法及撐桿控制面積法確定環(huán)索預應力比,選取支座徑向位移相等準則及網(wǎng)殼頂點豎向位移相等準則確定環(huán)索預應力幅值,將它們進行交叉組合構成4個環(huán)索預應力設計方案。另外還選取剛性索法及改進剛性索法作為環(huán)索預應力設計方案,共6個預應力設計方案;以2008年北京奧運會羽毛球館弦支穹頂結構屋蓋為研究背景;研究了各個預應力設計方案的優(yōu)缺點和工程適用性。采用ANSYS優(yōu)化模塊零階優(yōu)化方法對弦支穹頂結構進行預應力優(yōu)化設計。即:以結構總重量為目標函數(shù),考慮構件的長細比、強度應力、穩(wěn)定應力和結構位移等約束,考慮12個結構設計荷載工況,針對不同的環(huán)索預應力設計方案,基于ANSYS-APDL編程語言編制了弦支穹頂結構優(yōu)化設計程序,充分考慮了預應力與構件截面的相互影響,實現(xiàn)了弦支穹頂結構優(yōu)化設計過程中環(huán)索預應力和構件截面同時優(yōu)化的目標。為了提高弦支穹頂結構優(yōu)化設計程度,首次提出改進罰函數(shù)優(yōu)化設計方法,并將改進罰函數(shù)優(yōu)化方法和傳統(tǒng)優(yōu)化方法的優(yōu)化結果進行綜合對比分析;研究表明:改進罰函數(shù)優(yōu)化方法可有效提高了結構的優(yōu)化程度,以撐桿控制面積法確定環(huán)索預應力比,以支座徑向位移相等準則確定環(huán)索預應力幅值,所獲得的結構重量最輕同時結構水平與豎向剛度也最大。為了更深入全面的研究弦支穹頂結構的靜力性能,本文詳細探討了包括結構矢跨比、撐桿長度、預應力大小、撐桿面積、環(huán)索面積等參數(shù)對其靜力性能的影響;以期為今后弦支穹頂結構的工程設計和實際應用提供有價值的參考。
[Abstract]:The chord dome is a light prestressed long-span spatial structure composed of single-layer reticulated shell and cable-bracing system. It has good mechanical performance, has a long span of space and has beautiful shape. At present, it has been widely used in terminal buildings, stadiums and stadiums. The roof structure of large public facilities such as Beijing 2008 Olympic Feather Hall and Jinan Olympic Sports Center Gymnasium is this kind of structure system. The core of the design of chord dome structure is to determine the optimum ring cable prestress, which will seriously affect the mechanical performance of the structure and the steel consumption of the structure. In order to determine the optimal prestress design scheme of the dome structure, the geometric method and the bracing control area method are selected to determine the prestressing ratio of the ring cable. The radial displacement equality criterion of support and the vertical displacement equality criterion of the vertex of reticulated shell are selected to determine the prestressing amplitude of ring cable, and four design schemes of ring cable prestress are constructed by cross combination of them. In addition, the rigid cable method and the improved rigid cable method are selected as the design scheme of the ring cable prestressing force, six prestressing design schemes are selected, and the research background is the roof of the domes of the Feather Hall of the Beijing Olympic Games in 2008. The advantages and disadvantages of each prestress design scheme and its engineering applicability are studied. The zero order optimization method of ANSYS optimization module is used to optimize the prestressed design of the dome structure. That is, taking the total weight of the structure as the objective function, considering the constraints of the aspect ratio, the strength stress, the stability stress and the displacement of the structure, 12 structural design load conditions are considered, and different design schemes of the ring cable prestress are considered. Based on the ANSYS-APDL programming language, the optimization design program of the domes structure is developed, which fully considers the interaction between the prestress and the section of the members, and realizes the goal of the optimization of the cable prestress and the section of the members during the optimum design of the domes. In order to improve the degree of optimal design of the dome structure, an improved penalty function optimization method is proposed for the first time, and the optimization results of the improved penalty function optimization method and the traditional optimization method are compared and analyzed synthetically. The study shows that the improved penalty function optimization method can effectively improve the optimization degree of the structure. The ratio of ring cable prestress is determined by the method of bracing control area, and the amplitude of ring cable prestress is determined by the criterion of equal radial displacement of support. The weight of the structure is the lightest and the horizontal and vertical stiffness of the structure is also the largest. In order to study the static performance of the chord dome structure more thoroughly, this paper discusses in detail the influence of the parameters including the rise-span ratio of the structure, the length of the brace, the size of prestress, the area of the brace and the area of the ring cable on the static performance of the dome. In order to provide valuable reference for the engineering design and practical application of the dome structure in the future.
【學位授予單位】：廣州大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU399

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