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Study on Shock Isolation and Reduction of Spatial Reticulated Shell Structure on the Ground Subjected to An Underground In-tunnel Explosion

Author: WangChunYuan
Tutor: TianLi
School: Tianjin University
Course: Structural Engineering
Keywords: Underground tunnel Explosion overpressure Reticulated shells with Mitigation and isolation Rubber bearings Viscous dampers
CLC: U451;TU352.12
Type: Master's thesis
Year: 2010
Downloads: 59
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Abstract


Reticulated shells with span space structure as a widely used because of its structural forms, rod and range of the number of nodes, natural frequency distribution intensive features, it is still relatively limited mitigation and isolation of this structure , but mainly in the seismic and wind. In recent years, subway station explosion frequent the strong shock wave not only a direct result of the number of casualties, also the tunnel lining suffered serious damage, and may spread to the adjacent surface structure. To explore the underground tunnels under reticulated shells with explosive shock mitigation and isolation measures and their effects, in this article for two latticed shell structure of the double cylindrical latticed shell and single layer latticed shell exploded in the underground tunnel under impact less the isolation effect system analysis. Research work and its results are as follows: (1) the application contains underground tunnels, semi-infinite soil and two types of reticulated shells with LS-DYNA software to establish (divided into non-seismic isolation rubber bearing isolation and replace the damper rod pieces Dampers three cases), including coupling system model. Through the establishment of explosives - air - tunnel coupling model to calculate the blast overpressure loading on the tunnel wall. The established analog foundation soil Drucker-Prager model to simulate the high strain rates, HJC model and simulation of large deformation of concrete steel follower plastic material model (strain rate) material parameters. This mitigation and isolation techniques, including rubber bearings and viscous dampers, and LS-DYNA software Blatz-Ko rubber model and linear viscous damper model were used to simulate the laminated rubber bearing and linear damper. (2) the application of this method is the double-layer cylindrical reticulated shell under the impact of the blast wave tunnel set of rubber bearings and replace the damper rod, including mitigation and isolation. The study found: in the tunnel with the class of latticed shell distance under certain circumstances, the latticed shell of the tunnel along the longitudinal arrangement the most adverse circumstances; set of rubber bearings and replace the damper rod could significantly reduce the double cylinder The network-shell rod stress, the relative displacement of the nodes at both ends of the rod and the node acceleration response peak, at the same time, set the rubber bearings but also to extend the period of oscillation of the structure; tunnel along the network shell longitudinal arrangement should replace chord, when the tunnel along the network shell transverse arrangement, should be used to replace the vertical rod. (3) application of this method in two ways, using the set of rubber bearings and replace the damper rod, single layer latticed shell suffered under the impact of the blast wave tunnel Numerical Analysis of Seismic Isolation. The study found that: set of rubber bearings and replace the damper rod can significantly reduce the single-layer reticulated shell rod peak stress and node acceleration peak, but also to significantly prolong the period of oscillation of the structure; In various alternative damping rod member replaced diagonals manner best damping effect. The results of this research, provides an important reference for the design and engineering application of mitigation and isolation of these two types of reticulated shells with underground explosion wave impact.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure > Isolated structure
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