【摘要】：筒形交叉環(huán)管-索網(wǎng)幕墻主要由交叉環(huán)管骨架和馬鞍形單層索網(wǎng)組成。8個橢圓形環(huán)管以與地面呈一定角度放置,在空間上相互交叉形成56個區(qū)格,作為幕墻支承骨架；幕墻索網(wǎng)被骨架環(huán)管分割,形成相對獨立的56片索網(wǎng)填充于骨架區(qū)格內(nèi)。交叉環(huán)管和索網(wǎng)共同構(gòu)成幕墻主體,底部通過支座與裙樓相連,頂部通過連接桿件與屋蓋結(jié)構(gòu)相連,立面上布置大量傘狀支撐與主體結(jié)構(gòu)相連,從而使幕墻依附于主體結(jié)構(gòu)。此類結(jié)構(gòu)具有體型大、造型美觀等特點,但構(gòu)件布置復(fù)雜,拉索數(shù)量巨大,索力相互影響大,結(jié)構(gòu)受力復(fù)雜,給設(shè)計及施工都帶來了相當(dāng)大的難度。武漢萬達(dá)漢秀劇場項目為大型水上表演中心,富有濃郁中國元素的傳統(tǒng)“紅燈籠”造型極好地詮釋了漢文化的特點,而筒形交叉環(huán)管-索網(wǎng)幕墻形象地表現(xiàn)了這一造型。本文結(jié)合該項目,對筒形交叉環(huán)管-索網(wǎng)幕墻進(jìn)行了索網(wǎng)找形-找力方法的應(yīng)用研究,結(jié)構(gòu)動力特性與荷載分析,施工方法及施工全過程模擬分析的研究,索夾抗滑移性能試驗研究及關(guān)鍵節(jié)點性能研究。以下就此分別進(jìn)行介紹：對索網(wǎng)結(jié)構(gòu)的常見形式及工程應(yīng)用進(jìn)行了歸納總結(jié)。索網(wǎng)結(jié)構(gòu)主要應(yīng)用于場館屋蓋結(jié)構(gòu)及玻璃幕墻中,而武漢萬達(dá)漢秀劇場項目中索網(wǎng)結(jié)構(gòu)應(yīng)用于碟片式鏤空幕墻中,與常規(guī)屋蓋索網(wǎng)結(jié)構(gòu)的水平向布置不同,又與封閉式玻璃幕墻不同,具有其獨特之處。對該幕墻的工程概況及結(jié)構(gòu)特點進(jìn)行介紹。對索網(wǎng)結(jié)構(gòu)的找形-找力進(jìn)行了細(xì)致的研究。為了找到滿足已知預(yù)應(yīng)力狀態(tài)力學(xué)平衡條件和結(jié)構(gòu)邊界條件的曲面,需要對結(jié)構(gòu)進(jìn)行找形分析,理論方面分別從非線性有限元法的拉索單元位移函數(shù)、UL坐標(biāo)列式的拉索單元、非線性平衡方程的求解方法以及非線性有限元法找形的具體方法進(jìn)行了研究。編制了相應(yīng)的計算程序,利用小彈性模量找形法對索網(wǎng)進(jìn)行找形,在不考慮拉索及索夾自重的條件下找到滿足預(yù)定等效預(yù)張力的索網(wǎng)形態(tài)。同時從拉索等效預(yù)張力的施加、迭代法找力分析理論兩個方面對結(jié)構(gòu)找力分析進(jìn)行了研究。同樣在不考慮索網(wǎng)及索夾自重條件下找到與找形結(jié)果相對應(yīng)的索力分布,并在此初始平衡態(tài)下考慮索網(wǎng)及索夾自重,得到恒載初始態(tài)下的索力分布。在幾何大變形下求解結(jié)構(gòu)平衡剛度,基于恒載初始態(tài)的剛度求解結(jié)構(gòu)的動力特性,該幕墻結(jié)構(gòu)自振頻率密集,振型以局部彎曲為主。研究處于恒載初始態(tài)的索網(wǎng)結(jié)構(gòu)在外荷載作用下的性能。索網(wǎng)幕墻自重輕、剛度小,屬于風(fēng)敏感型結(jié)構(gòu),重點研究在風(fēng)荷載作用下的結(jié)構(gòu)性能。由于鏤空幕墻沒有防水防撞等要求,故雖索網(wǎng)在正常使用極限狀態(tài)下變形較大但仍能滿足要求。承載能力極限狀態(tài)下結(jié)構(gòu)應(yīng)力適中,安全且經(jīng)濟(jì)。在極限風(fēng)荷載作用下鋼結(jié)構(gòu)部分未見明顯剛度退化,而索網(wǎng)由于幾何效應(yīng)剛度更是有所增加。除風(fēng)荷載外,溫度作用對預(yù)應(yīng)力索網(wǎng)結(jié)構(gòu)的預(yù)張力將產(chǎn)生一定影響,進(jìn)而影響索網(wǎng)的整體剛度,故溫度作用也作為重要荷載進(jìn)行分析。分析結(jié)果顯示,±30℃的溫度荷載對索網(wǎng)變形的影響為風(fēng)荷載引起變形的1/27左右。索網(wǎng)幕墻結(jié)構(gòu)拉索數(shù)量大,結(jié)構(gòu)整體性強,不同的施工順序?qū)こ塘�、施工精度、工期等都有很大影響。通過協(xié)調(diào)各目標(biāo)間的矛盾,確定合理的施工順序,并據(jù)此進(jìn)行施工全過程模擬分析,掌控施工過程結(jié)構(gòu)安全并為拉索張拉控制力提供參考。索夾的抗滑移性能與關(guān)鍵節(jié)點的受力性能良好是滿足結(jié)構(gòu)設(shè)計假定的重要保證。對索夾抗滑移性能進(jìn)行了試驗研究,結(jié)果顯示索夾的最大抵抗不平衡力約為11kN。對關(guān)鍵節(jié)點的受力性能進(jìn)行實體有限元分析,對不滿足結(jié)構(gòu)要求的節(jié)點提出針對性的加固措施。最后,對本文的研究工作進(jìn)行了總結(jié),指出本文的主要研究結(jié)論及需要繼續(xù)研究的問題。
[Abstract]:The cylindrical cross-loop-cable net curtain wall is mainly composed of a cross-loop framework and a saddle-shaped single-layer cable net, And a relatively independent 56-piece cable mesh is formed in the framework region lattice. The cross loop and the cable net together form a curtain wall main body, the bottom of the curtain wall body is connected with the skirt building through a support, the top part is connected with the roof structure through the connecting rod, a large number of umbrella-shaped support is arranged on the vertical surface and is connected with the main body structure, and the curtain wall is attached to the main body structure. The structure has the characteristics of large body size, beautiful shape and the like, but the structure of the component is complex, the number of the cables is large, the cable force is large, the structure is complex, and the design and the construction are very difficult. Wuhan Wanda-Hanxiu Theater project is a large-scale water performance center, and the traditional "red lantern" of the rich Chinese elements has a good interpretation of the characteristics of the Han culture, while the cylindrical cross-loop-cable-net curtain wall has shown this shape. In this paper, the research on the application of the cable-net-finding-force-finding method for the cylindrical cross-loop-cable-net curtain wall is carried out in this paper, and the research of the structural dynamic characteristics and the load analysis, the construction method and the simulation and analysis of the whole process of the construction, the research on the anti-slip performance of the cable clamp and the performance of the key nodes are studied. The general form and application of the cable net structure are summarized in this paper. The structure of the cable net is mainly applied to the structure of the roof of the venue and the glass curtain wall, and the structure of the cable net in the project of the Wuhan Wanda Hanxiu Theater is applied to the disc-type hollow curtain wall, and is different from the horizontal direction of the conventional roof cable net structure, and is different from the closed glass curtain wall, and has the unique advantages. The general situation and structural characteristics of the curtain wall are introduced. The finding-finding force of the cable net structure is studied in detail. in ord to find a curved surface that satisfy that mechanical balance condition and the structural boundary condition of the known pre-stressed state, the structure can be shaped and analyzed, the cable unit of the cable unit of the non-linear finite element method, the cable unit of the UL coordinate system are respectively derived from the theoretical aspect, The solution of the nonlinear equilibrium equation and the method of finding the shape of the nonlinear finite element method are studied. A corresponding calculation program was prepared to find the shape of the cable net by using the method of small elastic modulus to find the shape of the cable net satisfying the pre-tension of the cable and the cable clamp under the condition of not considering the self weight of the cable and the cable clamp. At the same time, the force analysis of the structure is studied in terms of the application of the equivalent pre-tension of the cable, the iterative method and the theory of force analysis. And the cable force distribution corresponding to the finding result is found under the condition that the cable net and the cable clamp are not taken into consideration, and the cable net and the cable clamp self-weight are taken into consideration in the initial equilibrium state to obtain the cable force distribution under the constant load initial state. The dynamic characteristic of the structure is solved by the stiffness of the initial state of the constant load, and the natural frequency of the curtain wall structure is dense and the vibration mode is mainly based on the local bending. The performance of the cable net structure under the influence of the external load is studied. The cable net curtain wall has light self-weight and small rigidity, and belongs to the wind-sensitive structure, and focuses on the structural performance under the action of wind load. Because the hollow curtain wall does not have the requirements of water-proof and anti-collision, the deformation of the cable net in the normal use limit state can still meet the requirements. The structural stress is moderate, safe and economical in the limit state of bearing capacity. There is no significant stiffness degradation of the steel structure under the limit wind load, and the stiffness of the cable net is increased due to the geometric effect. In addition to the wind load, the effect of temperature on the pre-tension of the pre-stressed cable net structure will have a certain effect, and further influence the overall stiffness of the cable net, so the temperature effect is also analyzed as an important load. The results show that the effect of the temperature load of 30 鈩，

本文編號：2490957