Research On Key Technology Of Design Theory And Construction Control In Spoke Tension Structures

The control of configuration and force is the primary content of constructioncontrol. For tension structures, since pre-stress is one of the main sources of stiffness,structural configuration and force depend on each other and they are more difficult tocontrol than ordinary rigid structures. Based on spoke structural roof, this paper studiedits key problems of design theory and construction control.Firstly, according to the topologic properties of spoke structures,Constraint Removal Method and Nodal Displacement Method are proposed forforce-finding analysis. These two methods can find the distribution of pre-stressof the spoke structures associated with general finite element software directly.They are the foundation of integrated analysis for spoke structures’ design andconstruction control.Aimed at the application of Design and Tension in Fixed Length and SizeTechnology, a method to determine the length tolerance criteria of cables inspoke structures is obtained, which is based on first-order-second-momentreliability index. With respect to the sensitivity of pre-stress variation to cableslength error, the method divides spoke structures’ members into two categories:local sensitive members and global sensitive members, and give them differentlength tolerance criteria. The criteria are the construction and acceptancestandard of Bao’an Stadium.The influence of construction environment temperature on initial pre-stressstate of spoke structure is studied. It is proved that the difference between themanufacturing temperature of compression ring and cables affects the initialpre-stress state mostly while the influence of installation temperature inconstruction site can be ignored. A method to evaluate the affection ofcompression ring’s configuration error and the phenomena that curtain wallsystem gets involved in the tension process is brought forward and used in theconstruction of Bao’an Stadium.A method to estimate cable force based on static displacementmeasurement is proposed, which can be used in tension structures with singleself-stress mode. The disturbance of displacement measurement error to the veracity of cable force estimation result is researched. With the comparing ofseveral load-measurement schemes, it is summarized that the load scheme toimprove veracity of cable force estimation result is the load under which thestructural geometric stiffness takes primary effect. The method was carried outon a spoke structure and a cable dome respectively and proved to be available.The influence of finite element model’s configuration error and the method’sapplication on the multi-self-stress-mode structures is discussed.According to Bao’an Stadium, an integrated model of spoke structural roofwith scale of1:10was built. Several tension schemes and cable-breakingexperiment were carried out on the model. The course of cable forces duringtension process and the requirement for capacity and amount of tensionequipment were compared with experiment data and numerical analysis.Optimal scheme was selected and used as reference for construction of Bao’anStadium. The experiment also proved that Design and Tension in Fixed Lengthand Size Technology is available.