A Comparative Study Of Influence Factors And Analysis Methods On The Progressive Collapse-resistant Behavior Of Prefabricated Steel Frame Structure

Prefabricated steel frame structure with inclined support joints is a novel structural system, with the advantages of environmental protection, construction speed, recycled materials, re-utilization. So this structure has a broad development prospect and practical value. The engineering structures may be subjected to various accidental emergencies, such as explosions, fire, and car crash etc, in their long life. These accidental emergencies may lead to the damage of the main force components, and thus lead to the progressive collapse. Once the event of progressive collapse of structure occurs, it will result in tremendous casualties and economical loss, and have a bad impact on society. Therefore, scholars around the world have carried out a large number of experimental and theoretical research on the progressive collapse-resistant performance of structure in recent years. However, there is no deep research on the progressive collapse-resistant performance of prefabricated steel frame structure with inclined braces. In this thesis, the alternate path method was employed to study the progressive collapse-resistant performance of prefabricated steel frame structure with inclined braces. The main contents are as follows:(1) The definition of the alternative path method was introduced in terms of the United States criterias GSA2003 and Do D2013. Column fuction loss position, load combinations, methods of analysis, and the failure criteria were compared.(2) Pushdown method was employed to perform the vertical pushover analysis on precast inclined support joint steel structures and prefabricated steel frame structures in case of the side column or the middle column loss using the finite element software SAP2000. The force transmission path and the force performance of prefabricated steel frame structure were analyzed.(3) Instantaneously applied load method was employed to perform the dynamic nonlinear analysis on precast inclined support joint steel structures. The effects of fail time, column fuction loss position, diagonal brace, material yield strength, damping ratio and joint rotational stiffness on the progressive collapse-resistant performance of prefabricated steel frame structure with inclined braces were analyzed, respectively.(4) Linear static analysis, nonlinear static analysis and nonlinear dynamic analysis methods were employed to evaluate the progressive collapse-resistant performance of prefabricated steel frame structure with inclined braces according to the US an-ti-progressive collapse criterias GSA2003 and Do D2013, respectively. Then, the evaluation results of these methods were compared.