爆炸冲击下柔性支承土结构动力响应分析及影响因素分析
摘要：为了分析柔性轴承 - 土 - 结构体系下爆炸的动态响应，以及影响因素，，灵活轴承 - 土 - 结构系统的动力学模型建立，仿真分析进行。首先，研究开发在国内外进行了总结。第二，爆炸效果简化讨论。然后，柔性承压土梁和灵活的轴承土拱系统爆炸动态模型分别构造。最后，获得刚度周末效应和爆炸荷载柔性轴承的阻尼，和偏转的效果和内力。Abstract: In order to analyze the dynamic response of flexible bearing-soil-structure system under explosion, and the affecting factors, the dynamic model of flexible bearing-soil-structure system is established, and the simulation analysis is carried out. First, the research development at home and abroad is summarized. Second, the simplification of explosion effect is discussed. Then, the explosion dynamic models of flexible bearing-soil-beam and flexible bearing-soil-arch system are constructed respectively. Finally, the weakened effect of stiffness and damping of flexible bearing on the explosion load, and the effect of the deflection and the inner force are obtained.
The flexible bearing-soil-structure system has many features of reasonable mechanics, simple creation and beautiful shape, which is applied in engineering widely, such as bridge engineering and building engineering. Recently the bridge and building has become the main object of bombing by the terrorist, if the explosion happens, it can cause casualties and property damage. Therefore studying the dynamical response rules of flexible bearing-soil-structure system under explosion and analyzing the affecting factors have very important theoretical and practical significance.
The explosion load has the following features: the peak is high, spreading speed is big, and the effect is rapid, therefore the dynamical features of structure under explosion are very complex. The research on the dynamical response of structure under explosion has been concerned by many scientists, and good achievements have been obtained. Babak Panahi et al applied finite element technology to analyze the dynamical response of cylindrical structure under explosion, and the changing rules of stress and velocity for the cylindrical structure under explosion was analyzed [1]. James LeBlanc et al studied the dynamical response of composite plate under explosion load, and the experimental test and the finite element simulation based on LS/DYNA are carried out respectively, and the dynamical response rules of it is obtained [2]. Mu Chao-min applied 3D finite element programmer and field test to study the dynamical response rules, and results showed the dynamical response of a shell as a blast chamber was decided by the first pressure impulse, and the maximum strain of the shell decreased away from the explosion center [3]. Gao Xuan-neng carried out numerical simulation for large space structure under the internal explosive loading based on ANSYS／LS—DYNA, the influence of the ratio of rise to span and explosive position on the dynamic responses of the structure was analyzed [4]. As seen from current achievements, so far the report on dynamical response research of flexible bearing-soil-structure system under explosion load has not been given, therefore it is significant to study it in depth.
2 Simplification of explosion effect
3 Flexible bearing-soil-structure system model
5 Case study
6 Conclusions总结
The explosion dynamical models of flexible bearing-soil-beam system and flexible bearing-soil-arch system are constructed respectively based second class Lagrange equation and virtual work principle, and the relationships between the explosion load and stiffness (damping) of flexible bearing for flexible bearing-soil-beam (arch) system are obtained through solving the dynamical model. The response rules of with the changes of stiffness and damping of the bearing through simulation analysis. The flexible bearing-soil-beam system and flexible bearing-soil-arch system have the same dynamical response rules, the increasing of the stiffness can improve the weakening effect for explosion load, and the decreasing of the damping can also improve the weakening effect for explosion load. With the increasing of the stiffness of the bearing, the deflection of beam decreases accordingly, and the shear force increases accordingly. With the increasing of the damping, the deflection and shear force of beam all decrease.
References文献
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