| Recently, terrorism happens much more frequently than ever all over the world, at the same time, as the rapid development of the globalization and economy, accidental explosions might also occur because of the electric machine or the aging of the gas container or improper storage of tinder and explosive in chemical plants and industrial production problems. The process of explosion is very short and fleeting,if it happens, there is no time to take measures to control it. The strong explosion wave action to the explosion source nearby building not only can damage the structural components or even can cause a key member of the building lose its effectiveness and loss of bearing capacity, eventually lead to progressive collapse of these structures, and bring losses which can not be estimated to human life and property. So strengthening the research of this field is particularly important.Bearing pillar as one of the key component of the structure, study of performance behavior under surface burst explosion load is very necessary. Circular steel tube composite columns filled with steel reinforced concrete as a new type of structure. At present, there are many researches on its mechanical properties under quasi-static load.However, there are few investigations under explosion load. Therefore this paper is based on ABAQUS software to proceed numerical simulation, and study the dynamic response of steel reinforced concrete filled with steel tube concrete column under explosion load. The main work is as follows:(1) Summarizing the present situation of structures' collapse-resistent study at home and abroad, inroducing briefly circular steel reinforced concrete filled with steel tube concrete structure which is studied in this paper, and analyzing the basic characteristics of blast, on the basis of the blast wave parameters,ascertaining the relationship between the weight of explosive and explosive distance and the blast peak pressure and duration,the overpressure model on structures under explosion can be suitably used to simulate the blast effect on structure, and it was applied to the ABAQUS dynamic finite element method.(2) In order to accurately reflect the structure's dynamic characteristics and failure mechanism under explosion load. Simulated in this paper, concrete uses concrete damaged plasticity which considers damage accumulation and strain rate effect, steel uses classic metal plasticity, this model are suitable to simulate the dynamic response of concrete and reinforcement under explosion load.(3) This paper is based on ABAQUS software to proceed numerical simulation to steel reinforced concrete filled with steel tube concrete column, and describes briefly the function characteristic of ABAQUS,(4) In the paper, it mainly study the effects of scaled distance; CFRP; stirrup; slenderness ratio; axial-compression ratio and end constraints on blast resistance of steel reinforced concrete filled with steel tube concrete column under explosion load. The results show that the blast resistant capacity of the steel reinforced concrete filled with steel tube concrete column can be increased through increasing scaled distance; using CFRP strengthening; encrypting stirrup spacing; incresinging slenderness ratio; reducing axial-compression ratio and adopting reasonable end constraints. |
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