NUMERICAL SIMULATION FOR CONSTRUCTION PROCESS OF TENSILE STRUCTURES

摘要

Long-span tensile structures are used widely in Olympic Games and World Cup stadiums. But constructionrncontrol is a difficult and important problem. For large deformation occurs with rigid body displacement in theirrnforming process. The reason that large deformation occurs is that tensile structures in construction process arerngeometric changeable structures. Tensile structures are different from normal structures because rigidity ofrntensile structures come from prestress which is introduced through construction. In the course of introducingrnprestress, for the interrelationship of cables, it’s difficult to obtain the designed stage through tensioning cablesrnonly one time. The construction process has an intensive relationship with the design. Especially the project ofrnintroducing prestress directly determines whether the designed prestress equilibrium can be obtained. So,rnconstruction analysis is necessary for tensile structures. In this paper, 3 states in forming process of tensilernstructures are divided, which are zero prestress state, construction state and initial prestress state. And the inversernprocess analysis method is proposed which can simulate tensile structures construction procedure. Through thernmethod, the tensile force and deformation in the course of construction of a tensile structure can be obtained. Thernappropriate construction project, which is simple and economical, can be selected through calculation results ofrndifferent tension orders. At the same time, the designed prestress can be obtained through tensioning one timernand cable force needn’t to be adjusted many times. Interrelationship of members forces are considered in thernmethod. And tension forces in every step of construction are obtained through the method. An example indicatesrnthat the inverse process analysis method can be used to analyse the construction process of tensile structures.