摘要：為了分析柔性軸承 - 土 - 結(jié)構(gòu)體系下爆炸的動(dòng)態(tài)響應(yīng)，以及影響因素，，靈活軸承 - 土 - 結(jié)構(gòu)系統(tǒng)的動(dòng)力學(xué)模型建立，仿真分析進(jìn)行。首先，研究開(kāi)發(fā)在國(guó)內(nèi)外進(jìn)行了總結(jié)。第二，爆炸效果簡(jiǎn)化討論。然后，柔性承壓土梁和靈活的軸承土拱系統(tǒng)爆炸動(dòng)態(tài)模型分別構(gòu)造。最后，獲得剛度周末效應(yīng)和爆炸荷載柔性軸承的阻尼，和偏轉(zhuǎn)的效果和內(nèi)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. 

Key words：bearing-soil-structure system; dynamic response; explosion effect
   

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.

1 Research development at home and abroad
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總結(jié)

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文獻(xiàn)

[1] Babak Panahia, Esmaeal Ghavanlooa, Farhang Daneshmand. Transient response of a submerged cylindrical foam core sandwich panel subjected to shock loading. Materials & Design, 2011, 32(5):2611-2620.
[2] James LeBlanc, Arun Shukla. Dynamic response of curved composite panels to underwater explosive loading: Experimental and computational comparisons. Composite Structures, 2011, 93(11):3072-3081.
[3] Mu C.M., Ren H.Q., Li Y.C. Blast flow field evolution and dynamic response of a blast chamber. Journal of Vibration and Shock, 2010, 30(2):82-86.
[4] Gao X.N., Wang S.P. Numerical Simulation for Dynamic Response of Large-Space Cylindrical Reticulated Shell under Internal Explosion by Ritz-POD Method. Journal of Civil, Architectural and Environmental Engineering, 2010, 32(2):64-70.
[5] Hung C.F. , Lin B.J. , Hwang-Fuu J.J. . Dynamic response of cylindrical shell structures subjected to underwater explosion, Ocean Engineering, 2009, 36(8): 564-577.
[6] Zong, Z., Zhao, Y.-J., Xu, F. Dynamic responses of a full-scale aluminum ship subjected to underwater shock, Journal of Ship Mechanics, 2013, 17(6): 656-671.
[7] S. Abrate. Interaction of underwater blasts and submerged structures, Solid Mechanics and its Applications, 2013, 192(1): 93-150.
[8] Zhang X.H., Duan Z.D., Zhang C.W. Shock responses of steel frame structure near the ground explosion,Journal of Earthquake Engineering and Engineering Vibration, 2009, 29(4):70-76.
[9] Zhang X.H., Wang Z.H., Zhao L.M. Dynamic Plastic Response of Sandwich Plate with Aluminum Honeycombs Core under Blast loading, Chinese Journal of Applied Mechanics, 2009, 26(2):259-263.

本文編號(hào)：41548