| With the uneven development of world politics and economy,the terrorist activities are becoming more and more rampant.Because of its simple,lethal,great social influence and other characteristics,the terrorist explosion attack has become the most important and commonly used form of terrorism.The CTH,which is of great important strategic significance to national and regional politics,economy and cultural,is an important transportation infrastructure.Therefore,blast attacks in or on the transportation hub buildings not only will cause a large number of casualties and equipment damage,but also can lead to immeasurable economic losses and serious social panic.In this paper,research methods of explosion wave propagation,explosion damage modes and collapse mechanism of CTH projects are summarized and analyzed through literature review,data analysis,field research and numerical simulation.Then,the anti-explosion protection technology and corresponding countermeasures are put forward.The specific content as follows:(1)The advantages and disadvantages of the empirical formula,test and numerical simulation method to study the explosion wave propagation law are summarized firstly.Then,taking the port of Tianjin "12/8" particularly serious fire explosion accident as the background,calculate results of the empirical formula and numerical simulation method are compared and analyzed.Based on the summary and analysis results,and considering the requirement of calculation cost and accuracy,the suitable simulation methods of blast wave propagation of CTH projects under different working conditions are advised.(2)Selecting the typical structure and components of the CTH project and analyzing their damage modes under explosion.By summarizing the existing results,the failure and collapse mode of reinforced concrete frame structures under different blast loads are obtained.Then selecting the grid of Donghai Road Station of Jinbin Light Rail as the research object and numerical analyzing its cause of disaster and collapse mechanism in "12/8" explosion accident.Analysis results show that the reason of collapse of grid structure is the failure of connected nodes at the head of columns under blast waves,and the influence of explosion ground motion on the grid structure is very small.(3)According to explosion damage mechanism of structure and components of the CTH project,anti-explosion protection technical measures and countermeasures of the CTH project are proposed from following aspects: clear distance,isolation facilities,anti-explosion measures of components and structure,new security system,comprehensive monitoring system and explosive disposal equipment. |
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