Research On The Performance-Based Anti-Progressive Collapse Design Of The No-Plaform-Pillar Awning

No-plaform-pillar awning have open space, light and beautiful shape, etc. It meets the use and image requirements of modern high-speed rail station and becomes an integral part of the current railway station. However, as the speed up of train transportation rhythm and the increase of train speed, combined with the artificial and natural uncontrollable factors, dozens of train derailment events already have occurred around the world. When a derailed train impacts the structure of the adjacent track, especially in the large volume, low redundancy structure which holds dense crowd, it not only may cause great loss of life and property, also can produce the bad social influence. The research on the anti-progressive collapse of the no-platform-pillar awning suffered a derailed train crash has important practical significance.This paper introduced the performance design to the research of train derailment impact force and no-platform-pillar awning integrity. In allusion to the impact force of train derailment, this paper put forward the theoretical framework of the performance-based design of no-platform-pillar awning anti-progressive collapse. Main content includes to determine the fortification level of impact force, the performance level of structure, and structural performance parameters, etc. According to the provisions of the current railway in our country, fortification level of impact force is the impact force when a train derails at a speed of 80 km/h and 250 km/h. Awning structure performance levels can be divided into good condition, slight damage, serious damage, collapse and so on. Vertical displacement of awning structure is selected to express the performance level. Existing studies have shown that purlin have important influence to the performance of awning structure for high-speed room anti-progressive collapse. However, the traditional purlin design only meets bending, buckling and structural requirementsThis paper took a no-platform-pillar beam string awning which is a large passenger high-speed railway station on the beijing-shanghai as an example and adopted the method of numerical simulation to analyze the effect of purlin connection mode, purlin distance and purlin span to the performance of awning after 1-2 pillar failure anti-progressive collapse. Compared with simply supported purlin, continuous purlin can better control the displacement of failure pillars. Comparing failure column displacement under different purlin spacing, I found that when purlin spacing was at 1.5m, the failure column displacement was minimum; There is an inverse relationship between purlin length and failure pillars displacement.The research results of this paper laid a theoretical foundation for the development of anti-progressive collapse theory. And it can also be used in some practical design awning structure.