Vulnerability Under Explosion Load Analysis Of Simply Supported T Beam Bridge

Bridge plays a very important role in the national economic life, once the terrorist attacks or accidental explosion, not only causes the bridge damage or even collapse, may also cause nearby personnel casualties and economic loss of property. However, the current domestic design specification for structural antiknock design requirements is still lacking, which caused the bridge existing antiknock ability is very weak, once the terrorist attacks or accidental explosion, will result in disastrous consequences. Therefore, to carry out the relevant basic response problems of concrete bridge structure and damage effect under blast loads and applied research to find the design theory and method is more reasonable, make the bridge structure can effectively resist the explosive loading is very necessary. In this paper, Henan Province, Yichang Bridge with fireworks explosion accident as the background, the main contents include the following aspects:1.Analysis of research status at home and abroad, study the basic theory of explosion, the study of damage mechanism of concrete bridge under explosion load, the bridge structure blast analysis method.2. Through the ANSYS software to establish the numerical model of a simply supported T beam under blast loading, study on dynamic response of reinforced concrete beam and the failure mode. By changing the ratio of distance, TNT equivalent, TNT relative to the position of the beam parameters such as beam body, numerical simulation of the explosion of simply supported T beam, analysis of antiknock performance of reinforced concrete simply supported T beam. Points out that changing parameters can cause the damage degree of reinforced concrete beams with different.3. Through the ANSYS software to establish the simulation model of simply supported T beam bridge, by changing the TNT relative to the position of the beam parameters, simulation of simply supported T beam bridge explosion, analysis of antiknock performance of reinforced concrete simply supported T beam bridge. It is pointed out that TNT changes the position relative to the bridge damage degree will affect the reinforced concrete beam bridge.4. Through the ANSYS software to establish the simulation model of simply supported T beam bridge, vulnerability of the specific location of the simply supported T beam bridge is analysed, the vulnerability and fragility curves are standard.