Model Experiment Of The Hybrid Mast-Cable System

Represented by cable structure and cable dome structure, the cable-strut tensile structure is widely applied and therefore being the research hotspot of large-span spatial structural system. Based on a real project, the performance of a new tensilestructure------the mast-cable hybrid system, is carefully studied by both theoreticalanalysis and model experiment in this thesis. It puts emphasis to discuss the rational shape, the structural property of original prestressed state, the structural behavior under load and the rational construction schemes.In chapter 1, after consulting the related literatures, the characteristic and classification of space structure are introduced firstly. Then the concrete contents in the analysis of tension structure and the engineering background of this thesis are described. Finally, the major research contents of this thesis are presented.In chapter 2, the relevant theories of shape analysis are reviewed firstly. Then the initial form of the mast-cable hybrid system is studied, including the kinematic analysis, the total feasible prestress and the structural geometrical stability. By adjusting the form of the structure, the total feasible prestress and the stable conditions can be satisfied in the end. Four shape-finding methods of the mast-cable hybrid system are discussed in this thesis also, and the better one is selected by comparing the formation process of every method which is simulated numerically in dynamic relaxation method.In order to understand the working property of the mast-cable hybrid system thoroughly and verify the reliability of theory analysis method, a model experiment is presented for tension structures of this style. In chapter 3, the design of the model experiment, model manufacture, and the methods and instruments for the modeling test are introduced. Then an experiment's scheme is made to meet the purpose of the model test. The measure method of cable force and node coordinates, the applying fashion of the prestress force, the loading measures of several load case and so on are discussed.In chapter 4, the four shape-finding methods which are mentioned above are carried out in the modeling test. Then the model's initial prestress distribution and node coordinates under the best one are measured and compared with the theoretical analysis. The result shows that they are identical. Besides, static tests are carried out of the structural under three different load case. The behavior of the structure under load is studied by analyze the results of statical experimen. In the end, some advices are put forward for real project.At the end of thesis, some conclusions are summarized and the problems which are needed to be studied in the further are presented.