| With the rapid development of modern science and technology, people’s demand on modern architecture will not limit to its function only, and it also needs to meet the art and aesthetic demands as well. Such demands urge the research and design staff make constant update and creation. And the space steel structure system of construction catches their special attention. It is mainly made of steel and low carbon materials. Steel structure materials are mainly characterized with the strong strength and stiffness, relatively lighter weight, thus, on construction projects, most of them are used in some super-tall, complex structure, and large span modern architecture. In addition, due to the uniformity of internal material and the same performance of every direction, the materials can be used to handle variety of assumptions. With its tenacity,elasticity and adaptability to deformation, it will not be destroyed when the dynamic and static force load acts on it. Therefore, it is widely adopted in modern architecture.Taking "Lujiang Stadium Roof Steel Truss Analysis and Mechanics Performance Test" project as background, the paper focuses on the systematic analysis of displacement, deformation, stress and internal force the structure when the structure is bearing kinds of loads and earthquake by using MIDAS/GEN finite element software and its theory. The key work is as following:(1) The development and application of the steel truss system at home and abroad,the classification of the truss structure and its connection form;(2) The steel tube truss work, the design principle, the theoretical basis to design,finite element analysis theory, the truss beam element calculation, the actual monitoring principle of engineering structures and related instruments;(3) Under different load condition, the paper completes the analysis and calculation of steel tube truss work by using the MAIDS/GEN finite element analysis software. And get the result of stress, internal force and deformation. Furthermore, it analyzes the ultimate bearing capacity, security, working state and degree of stability,finding the whole change rules, stress distribution and deformation meet the requirements;(4) Changes in rigid strength, displacement, vibration or swing scope are set onsteel tube truss work, in order to observe its stiffness change, and educe the rationality of truss element length and cross section, and good coordination and integrity of steel tube truss structure with;(5) In anti-seismic research, the condition is set in frequent earthquake, and the modal response spectrum analysis of truss structures is adopted. It is concluded that when different seismic wave is input in the structure stress, the structural bearing and deformation rules is in accordance with regulations; Also, in more severe earthquake,using elastic time history analysis method to study the anti-seismic capacity,displacement and deformation of the whole and local structure, and get the maximal displacement values. Plus, the paper makes a comparison of the structure’s reaction when bearing the combination of seismic wave and different single seismic wave, it is concluded that the change of structure during the seismic action is within the prescribed scope.(6) The paper compares the elastic time history analysis and modal response spectrum analysis, and sum up the two methods’ differences in the project. And the paper compares it with the practical projects, finding that the elastic time history analysis is closer to the actual situation;(7) After soring out of the data, the paper compares the results whit those that were received from our model, we found their changes are consistent basically. But there are a variety of factors; there are some differences in local structure tests.The paper makes a discussion of the structure design and the calculation during the design and put out some solutions, based on the analysis of Lujiang stadium roof steel tube truss structure, the security, and stability. |
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