Numerical Simulation Of Kiewitt8 Single-layer Reticulated Shell Subjected To Blast Loading

Severe destruction and invaluable loss of relevant countries, circumstance of worldwide politic and economy were caused by some disaters such as the collapse of World Trade Centre in'911', continuous attack of vehicle bomb in Iraq. Generally, long-span spatial structure is the landmark building in the local area and the expected performance of this significant structure subjected to blast loading should be paied more attention. Meanwhile, it is exceptionally important ot reduce the damege of such structure under blast loadingALE algorithm and the JWL state equation for the product of explosive detonation was used to study the propagation rules of TNT explosive blast wave in free air. The quarter finite element model for Kiewitt8 single-layer reticulated shell with span of 40m was set up using ANSYS/LS-DYNA. The method of gradually varied mesh size was applied to generate air finite element meshes. Not only can this method of generating meshes guarantee the calculating precision during the period of peak overpressure decaying rapidly but also reduce the number of finite element meshes to shorten calculating hours. The simulative peak overpressue was extracted and compared with that of empirical formulas to verify the creditability and applicability of numerical simulation.FME software ANSYS/LS-DYNA was adopted to analyse the dynamic response of Kiewitt8 single-layer reituclated shell with span of 40m subjected to blast loading with different TNT weights. By analysing the plastic development and fracture of each component as well as the deformation of reticulated shell, four response types of Kiewitte single-layer reticulated shell under blast loading were defined, that is No Impairment, Member Developing Plasticity, Large Deformation of Reticulated Shell and Destruction with explosion relief. In addition, the dynamic response rules in varied response types was analysed, including displacement of nodes, axial stress of members and plastic development of reticulated shell and structure.At last, by changing paramaters including rise-span ratio of reticulated shell, standoff distance, thickness of roof boarding and size of purlin hanger, the influence of structural respose given by these paramaters was analysed. Besides, the different dynamic response characteristics of strucutre with varied opening rates, opening numbers and opening positons on roof boarding were studied to obtain the explosion relief rules of roof boarding, which can offer the theory base and reference dates for explosion defence design of structures in engineering. The commonly uesed profiled steel sheet in engineering was chosen and the response characteristic of profiled steel sheet and plane steel sheet subjected to blast loading was analyzed.