PRESTRESSING ANALYSIS AND INSPECTION FOR HYBRIDIZED STRUCTURE COMPOSED OF PRESTRESSED RETICULATED SHELL AND STEEL ARCH

摘要

Based on Yangtse-River model-testing hall which is a national key engineering using loan of World Bank, a new type of large-span space structure, hybridized structure composed of prestressed reticulated shell and steel arch, is introduced. Then the limitations of traditional methods for prestressing analysis based on the conception of force are pointed out and from the view of initial cable deformation, influence matrix method for this structure is established. However, influence matrix method has some shortages in its application including complex computation and suppose of linear structural behavior. Accordingly, iterative method is presented to analyze the structure in this paper and results show that iterative method is more efficient and has better applicability in engineering compared with influence matrix method. Subsequently, a sequential method based on initial cable deformation is adopted to simulate the whole tension process. Therefore, the results of cable forces and displacements in every tension phase are obtained, thus providing theo- retical basis for the control of tensioning process. Finally, by the inspection of tensioning process, the theoretical analysis is verified and inspection results also demonstrate the safety of Yangtse-river model testing hall.