Study On Propagation Rule Of Blast Wave Of Car Bomb Which Explode On City Streets

As the terrorism growing and spreading in the world, it brought endless grief and agony to human beings which has became like the cancer to damage the nation security and society steady. Blast terrorist attack was the common and large used damage mode for the international terrorism of the moment in various terrorist attacking, however, because the car bomb could obtain in various ways, configured and hidden conveniently, and had great lethality and destructiveness, it became the main kinds of blast terrorist attack. Nowadays blast terrorist attack less occurred in our country, whereas as the terrorist attacking became internationalization and networking, affected by the forces of ethnic separatism, international hostile forces kept producing political propaganda of the secessionism, infiltration operations and terrorist attack in frontier ethnic region, which seriously impact the political stability and Border security in frontier region. Thus the blast terrorist attack has become one of the important factors of the threat of nation and city security. Damage effect of building structure after the blast terrorist attack, and research of building anti- blast terrorist attack protection technology should be paid wide attention to. In this paper, the propagation rule of air blast wave and the inflation to around builds after the car bomb explosion on city streets were studied by simulation experiment and numerical calculation, all of this works on the foundation of study results and primary theory analysis by pre-researchers, provided the necessary proof to estimate the damage effect of building structure after the car bomb terrorist attack, and explored protection technology of car bomb terrorist attack. The main works in this paper as follows:1. the purpose, significance, research existing state, object and main content of this paper are introduced.2. the basic theory of air blast wave caused by car bomb was system analyzed which included threat analysis of mode and charge of car bomb to build, the formation and transmission of blast wave caused by car bomb, flow motion, parameters of explosion wave and the effect of explosion wave to buildings.3. The simulation chemical explosion was carried out to study the car bomb blast on city streets. The propagation rule of blast wave caused by ordinary explosive on street and was studied, the influence rule of type of classical street crossings to blast wave diffusion also been researched. 4. Car bomb explosion on city streets was studied by numerical simulation. In order to profound study the propagation rule of blast wave of car bomb, the street model were build as 'T' and '+' two kinds of typical street and ANSYS/LS-DYNA 3D code was used to calculation.At last, the research finds in this paper are generalized, some valuable conclusions are got and the problems which need to go on researching are put forward.