Key Technology Of Intergrity-Lifting Construction Of Monolayer Spoke-Type Cable-Net Of Saddle Shape

Spoke-type cable-net structure is composed of external pressure ring beam, the radial cables and inner ring cables. This kind of structure system has mechanical characteristics of the whole tension structure, at the same time, it overcome several disadvantages of general tension structure, firstly, it has simple structural system, secondly, its force transmission is direct, thirdly, it's not easy to form institutions. The roof structure of sports center stadium that located in Suzhou Industrial Park, adopts spokewise saddle-shaped monolayer cable-net structure, which is composed of column, pressure ring beam, the radial cables and inner ring cables. The area of the roof structure is 36000 m2. The inclined v-shaped column form a conical space shell structure, it forms a rigid roof supporting structure and supports the top pressure ring beam directly.This article is based on the roof structure of the Suzhou Stadium and studys the spokewise saddle-shaped monolayer cable-net structure, it mainly includes the construction scheme determination, zero state finding, construction process and cable length error analysis. Specific work content and conclusions are as follows.We inductive the spoke-type tension structure's basic concepts, characteristics, common form, typical engineering applications and introduce the project summary, structure composition, characteristics, materials and specifications of steel structure and cable and main node form detaily, meanwhile, we elaborate the research status of the molding technology and the error sensitivity of the spoke-type tension structure at home and abroad.We summarize the construction methods of the spoke-type tension structure. According to the the roof structure of the Suzhou Stadium's mechanical characteristics that high cable force is smaller than low, we put forward the construction method named intergrity-lifting and high-altitude partial anchoring, it greatly saves equipment investment. According to the possible difficulties in the construction, we put forward the relevant measures such as arranging the crane transportation of the construction site, using the continuous traction increase jack and the innovative design of the tooling ear plate.We expound the theory and methods of force-finding and form-finding of the tension structure, it includes the form-finding of the whole structure's zero state and the force-finding of the cable and rod. According to the dead load state's configuration and cable force, we use the algorithm of iteration to find the zero state of the roof structure of the Suzhou Stadium and we get the steel structure installation state and extract the key assembled coordinates.We expound the analysis theory of the nonlinear dynamic finite named NDFEM, it includes analysis process and key technical measures. Then we use this method to carry out the construction process analysis of the roof structure of the Suzhou Stadium and we get the the structure configuration, cable force, and the steel structure stress of various working conditions in the construction process.Tensile structure's forming state is obviously influenced by cable length, tension force and outer-linked node coordinates, we need a variety of combination error impact analysis before construction to determine reasonable control index. In this article, we take the roof structure of the Suzhou Stadium as an example, through the random-error impact analysis, we can not only master how cable length errors and surrounding substructure's installation errors impact the cable force, but also determine the reasonable error control indicators, in addition, we carry out multiple comparison analysis research, firstly, we contrast three cable-length-error distribution models, including constant value distribution, uniform distribution and normal distribution; secondly, we contrast cable force influenced by radial-cable errors and ring-cable errors; thirdly, we contrast different cable-length error control standards. We can conclude that the average distribution has a greater impact on cable force than the normal distribution and has a smaller impact than the constant value distribution among the three kinds of cable-length error distribution models and if we reduce cable-length error limit, we can loosen the permitted installation errors of the outer-linked nodes.Finally, this paper summarizes the major research contents and achievements systematically and put forward the unsolved problems and further research direction.