The Dynamic Response And Optimum Design Of Vaulted Blast Resistant Door

With the terrorist attacks becoming more and more serious, some large civil and industrial buildings have become the primary target of terrorist. But the previous research of the explosion mainly focuses on the military engineering. When designing large civil and industrial buildings, anti-explosion performance of buildings has been considered rarely. As the important part of civil defense engineering and military engineering, the blast-resistant door is important channel of staff and equipment in and out. And it plays an important role in protecting the interior personnel. The research of antiknock starts relatively late in our country,and specification is less about the design of blast-resistant door. Therefore, the study of blast-resistant door has great practical value.This paper aims at researching the dynamic response of the blast-resistant door. And the main research contents are as follows:1. The formation, propagation and harm to buildings of explosion shock wave have been introduced in detail based on the collected relative information. For the convenience of research, the blast wave overpresure is simplified as triangular load, and the goal and principle to the design of structural antiknock are presented.2. This paper uses ANSYS/LS-DYNA to establish the finite element models of the blast-resistant doors in shape of flat and arch. A contrast analysis of these two blast-resistant doors under the action of same loads are made in terms of maximum displacements,equivalent stresses, acceleration, and energy etc.. The results show that the maximum displacement, equivalent stress, and acceleration of vaulted door are less than these of flat door, and the vaulted door is more suitable for bearing dynamic impact load which means vaulted door has obvious advantages in the aspects of antiknock.3. A further research of the vaulted blast-resistant door has been done in this paper by changing the boundary conditions, the panel thickness etc.. The results show that the material strength has less influence on the displacement and stress of the door, but the boundary conditions, the panel thickness and the thickness of frame beam plate have significant influence on the displacement and stress of the door. In order to conform to the actual situation, the boundary conditions use simply supported on four sides. In terms of the cost of the blast-resistant door, the most effective way to improve the antiknock performance is increasing the thickness of frame beam plate.4. In this paper, on the base of finite element analysis, the design requirements of the blast-resistant door have been provided. The reliability index based on support rotation angleand ductility ratio is put forward. And the displacement is calculated by the equivalent static method. Finally, the paper summarizes design suggestions and steps about the blast-resistant door.