| Concrete-Filled Steel Tube Arch Bridge is a new structure, which is beginning to flourish in recent years. Compared to traditional reinforced concrete, it has some advantages such as high bearing capacity, lightweight, high toughness, construction of convenience, pretty bridge type and so on, and has been widely used in long-span arch bridge. Meanwhile, modern transport system becomes more and more developed, the transportation of combustibles and explosive devices become more frequent. So, if the traffic accident occurred on the bridge especially for Half-Through Arch Bridge with Concrete Filled Steel Tube, its suspender would easily be damaged in the fire, and lead to the damage of whole arch bridge.This paper is based on the calculation method of research on fire-resistance of structures, whitch aims to the overall reaction of the steel structures under high temperature. The finite element analysis software ANSYS is applied to analyze the Large-Span Half-Through Arch Bridge with Concrete Filled Steel Tube, when some boom was in fire. The following researches have been carried out in the dissertation:①Summarized the rules of the material properties and mechanical properties under fire condition, and the model of stress-strain relationships for high strengthen steels under high temperature.②According to the experiment data, established ANSYS thermal and structure finite element analysis model, compared ANSYS results with experiment results, found the two results were similar, so verified the correctness of this analysis method.③Studied on the rule of arch rib and bridge's variation under high temperature, evaluated the region of influence, when some booms fired.④Studied on the internal force's variation of the boom and arch rib, Evaluated the fire resistance and critical temperature with bridge's boom under fire condition.⑤Analyzed the effects to arch bridge when the bridge deck and suspension member transversal girder was in different arrangement. |
PDF Full Text Request