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Dynamic Response of the Multi-storey Building Subjected to Blast Loading in Underground Tunnel

Author: GaoFangHua
Tutor: TianLi
School: Tianjin University
Course: Structural Engineering
Keywords: Tunnel explosion Soil - structure interaction Raft foundation Basement Pile foundation Frame structure Wall structure Dynamic Response
CLC: TU311.3
Type: Master's thesis
Year: 2009
Downloads: 85
Quote: 3
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Abstract

The powerful explosion in the subway, underground pipe network or underground space, near surface multi-story structure will produce the vibration response of the different forms and degrees, until it caused serious damage or even collapse. In this paper, the basic framework of the raft foundation frame structure, raft - wall structure, frame structure with a basement and pile frame structure are four types of multi-storey buildings suffered nearby underground tunnel explosion induced dynamic response analysis of research, The main research work and achievements are as follows: (1) using the ABAQUS software, the establishment of the tunnel - the soil - the multi-story building (structure) of the above four coupling system model. Application of LS-DYNA software to create three-dimensional model, including explosives, including air and tunnel wall, calculate the the overpressure loading tunnel wall; choice the concrete plastic damage model and the Drucker-Prager criterion to establish concrete materials and soil medium constitutive model; introduction of three-dimensional consistent viscoelastic boundary element semi-infinite foundation; master-slave model simulations of the contact surface of the soil - structure interaction; example, the application of LS-DYNA software to establish the tunnel - soil - raft foundation - the multi-layered framework structure coupling system model, the tunnel explosion under power in response to the results with the results of the proposed model are compared to verify that the proposed method is effective and reasonable; final explosion of the tunnel under the impact of the four types of structures in the single and double tunnel layout The distance between the structure and the tunnel system dynamic response of three cases of the change, as well as the explosion point along the tunnel longitudinal axis mobile. (2) The explosion of the raft foundation frame structure in the layout of the two-lane tunnel under the impact response decreased compared with single track tunnel layout, another parallel tunnel, set between the explosion tunnel structure will hinder consume part of the blast wave energy, thus weakening the the upper structural response. With the explosion of dot pitch the more recent structure, the structure of the displacement and internal force response is more intense, which is close to the point of explosion weakest underlying column end. (3) raft foundation raft foundation frame structure, superstructure, with the frame structure in the basement three types of multi-storey buildings in the tunnel explosion under the impact of the dynamic response of comparative calculations and found that three types of structure as from the explosion tunnel increasingly the more recent, are increasingly strong dynamic response, antiknock power performance distinction between them is gradually increasing. Anti-side performance and overall stiffness of the superstructure, is better than the other two structures response peak smallest; raft foundation framework structure of anti-side performance worst, the relatively violent response; As for the with basement frame structure, embedded solid basement The role of internal forces and deformation of the upper structure corresponding increase but more complex. (4) Pile Foundation multistory frame tunnel explosion under the impact of the dynamic response of the law and in front of three types of structures are similar, different the pile foundation simplified anisotropic media, of the pile-soil composite unit for the the antiknock analysis of the feasibility, through the power of the two different density of the pile group frame structure in response to a comparative analysis, revealed that the increase in the density of the pile group to improve the anti-side performance and overall stiffness of the structure, benefit structure Antiknock.

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CLC: > Industrial Technology > Building Science > Building structure > Structure theory to calculate > Structural Mechanics > Structural Dynamics
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