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Span tubular truss structure and properties of Roof System


Paper Keywords: spatial structure; steel truss structure; roof structure; calculation Abstract: means used in this analysis is based on theoretical analysis and practical engineering calculations based on tightly coupled, the conclusion has some significance and value in engineering, but also for further exploration of space provide the basis for steel truss structural system. Introduction space is a steel truss span space structure is an important member. Zhengzhou University new campus stadium to the truss by the three rings, three sets of radial trusses and three poles for the main components of the composition of the outer ring, the external loops of the radial truss structure with the main bearing skeleton, the design of the outer ring through the closed , to form a ring hoop tension, limiting the external side of the radial truss sliding bearing radial displacement, thus reducing the vertical deflection of the whole structure, in which, while meeting regulatory requirements, the structural steel reached Best economic indicator. Horizontal projection of the roof plane axisymmetrical shape the petals, in a radius of about 7m and 15m and the peripheral set at the three closed loop truss, set 24 along the radial space truss, and truss as a dividing ring staggered along the circumferential direction arrangement, the radial truss is divided into outer, middle and inner three parts. Simple appearance of the entire structure, Lightness, reasonable force, transfer directly, the overall performance is good. It helps to understand the structure and properties to explore, design and construction guidance, and provide the basis for the application of similar structure. 1 tubular truss structure outlined recent years, the steel structure not only in marine engineering, bridge construction has been widely used, but also in industrial and civil buildings used widely, steel structure, building structures in our country more and more applications, such as the use of Phase III of Baosteel square tube truss, Jilin skating training center, Harbin Ice and Snow exhibition, Shanghai, the Sports million square steel are used as the main structural elements, Guangzhou Gymnasium roof and round with a square steel pipe, the Shanghai Hongkou Stadium roof with circular steel bearing system as the Chengdu Shuangliu Airport roof use of a round steel as the main force component . In the field of public buildings, steel structure, the form of an endless stream of unique structure, such as the Sydney Aquatic Centre, the United States 迦登格罗芙 Crystal Cathedral; single large space area,[link widoczny dla zalogowanych], in addition to supermarkets, warehouse and warehouse to a wide range applications, also there are some very large structures, such as airport hangars in Singapore last chapter, Osaka International Airport Terminal; span structures in addition to light, such as pedestrian bridges and crane structure; other special purpose structures, such as the antenna mast and Space launchers and so on. 2001 completed construction area of ​​7250 exhibition in Beijing Botanical Garden Greenhouse is the first joints of the curve with steel truss structure. Steel timber for the 16Mn, the largest steel pipe specifications for 299mmx12mm, the total steel tonnage of 720t. Shanghai Stadium roof membrane structures mainly formed by the intersecting steel truss 32 Pin, ring beam composed of north-south symmetry of the saddle shape, the maximum span of 288.4m, elevation of 31.74-70.54m, maximum pipe diameter of the main truss 508mm, direct welded K-type node. The longest cantilever beam 74.162m, with the British steel material 50D. Nanjing International Exhibition Center is a long two-story exhibition hall 243m, 75m wide and large column-free space, curved roof, north and south ends of the main entrance of each cantilever 15m, 14m overhanging the west side of another. Uses a steel arch, purlin frame structure of the program. 2 in the form of steel truss structure and characteristics of 2.1 pipe truss classification: According to the bar by the force of character and layout can be divided into flat tube truss structure and for the Space truss structure. Plane truss structure of the winding tube, bottom chord and web member in the same plane, the structure of plane stiffness is poor, the general need to ensure that the structure of the lateral side support and stability. Pipe truss structure in the existing projects, the use of Warren Truss and Pratt truss forms, Warren Truss is generally the most economical arrangement, compared with the Pratt Truss Warren Truss is only half the number of its belly bar with the node, and the ventral rod material length of the uniform, this would greatly save material and machining time. Vierendeel truss mainly used in construction features or functionality of the arrangement of support does not allow the situation when the diagonal bars. For the Space truss structure is usually triangular cross section, compared with the flat tube truss structure, it can have a large span, and the triangular truss good stability and torsional rigidity and aesthetic appearance. Not arranged or can not be arranged outside the support surface of the occasion, providing a larger triangular truss span space. A set of triangular truss space frame structure is similar to a Pin, and more economical. Can reduce the lateral support members to improve lateral stability and torsional rigidity. For small span structures, lateral support may not be arranged. 2.2 connector commonly used in cross-section form cross-section in the form of round bars, rectangular, square, etc., by connecting the different components of the truss sections can be divided into the following form:
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