Performance Analysis On Large-span Complex Steel Truss Structure During Construction And Research On Key Problemsof Chongqing Jiangbei Airport

In recent years, with the rapid development of economy in our country, the building structures’ height and size are growing as well. The steel truss structure is applied more and more widely in order to meet the requirements of buildings’ bearing capacity and function. Steel truss structure always changes rapidly, which not only makes the structure design face a great challenge, but also makes the construction of steel structure encounter a lot of difficulties. Generally,on account of its good plasticity and high flexibility, the control of the steel structural deformation and the hoisting accuracy is particularly important in order to achieve the expected requirements.A lot of analysis and researches were done according to Chongqing Jiangbei T3 A terminal engineering. This will ensure that the structure stress and deformation in the construction process can meet the needs of design. The main research contents are as follows:①The development of large-span steel structure in recent years was described, what’s more, the development trend of large span steel truss, the application status and the classification standard were mainly introduced.②According to the constitutive mechanism of steel, some analysis about the structure performance of the largest T3 A terminal’s E area during the construction were done by the finite element analysis software. As a result, the whole slip scheme can meet the requirements of the construction project considering the temperature action.③The reliability of cast-steel joint was analyzed by the Workbench module of ANSYS. For its numerous connection bars, complex stress situation and difficult construction process, it is hard to ensure that each member can be docked effectively once the stress analysis are not in place. It was verified by the results of the experiment, which can form an effective monitoring data for the cast steel installation.④Measuring and positioning efficiency has been improved via the steel column and welding ball positioning method. This method ensures the accuracy of welded ball joints and the whole space truss system.The research result about the Chongqing T3 A construction of large-span steel truss terminal can provide reference for other similar engineering structures, and it has important practical significance for promoting the research and analysis of large-span steel truss structure theory.