Tension And Static Performance Experimental Study Of The New Type Hybrid-tension Structure

As a innovation of hybrid-tension structure used in the large-span roof structuralengineering, the new roof structure system of Baoji natatorium has five prominentcharacteristics: First, in a single specimens of roof trusses, the bottom chord iscomposed of two steel tension cables, which belong to a space curve; Second, in thevertical elements, there are not only using circular steel tube as the vertical webmembers, but also adopting tie rods to form the diagonal braces; Third, the rigid upperchord is made up of different forms part. Forth, along the vertical structure, themorphology of the upper and bottom chord are changed irregularly. Fifth, the two sidesof single specimens of roof trusses have different shapes, and the winding planefeatures obvious gradients.The changes of the structure’s morphology and composition will inevitably leadto the change of its mechanical properties. And because of the prestressing features, theapplication of steel tie rods will cause the tension construction process changes.Therefore, it is very urgent and necessary to research the prestressed construction andstatic characteristics of this new hybrid-tension structure. This problem is analysis inthis thesis on the experimental study and numerical theoretical analysis, which basedon a scale model.Firstly, it introduces the characteristics of the traditional hybrid structure andmakes a brief overview of the theory of non-linear finite element in hybrid-tensionstructure numerical analysis.Secondly, considered that such a large entity hybrid-tension structure test to be very rare, it described the detail of the experiment in the second chapter. And the testresults show that the prestressed construction scheme adopted in this test had a goodtension effect. The mechanical behavior of the structure under various loadcombinations can meet the requirements, and there is no any adverse phenomenonwhen the structure worked under a half span load. The maximum deflection of thestructure under the1.5times of design load are somewhat much less than the limit.Thirdly, through numerical analysis, the final tensioning scheme is selected forthe test, and a detailed study performed on the structural static performance. Theanalysis showed that the vertical stiffness of low-side part of the structure is a little bitweak, upper chord structure is subjected to axial force and a smaller moment. Thestatic performance of this new structure is familiar to the truss hybrid-tension structure.The test and analysis results are in good agreement, but there are obvious differences.The test results are better than the theoretical expectations, and pointed out that whichsections should be paid a particular concern in the engineering design.At the end of the thesis, the fifth chapter summarizes the whole text and gives aprospect to the next step.