| With the development of economy and society,the application of steel structure is becoming more and more extensive in the world.Because of the uncertainty of society and the complexity of the steel structure,fire and explosion of steel structures occur frequently.Fire and explosion are often accompanied;The explosion causes the fire and fire induces by explosion.So the study of fire and explosion under the combined effect of steel structure is very meaningful.In this paper,the finite element analysis software ANSYS is used to consider the effect of softening effect and the strain rate effect on the structural members.The dynamic response of the frame steel beam under the single fire,single explosion and the combined action of fire and explosion is analyzed.These include the following aspects:(1)Summarize the research status of steel structure fire resistance and anti-explosion at home and abroad,analyze and compare the similarities and differences of material properties of steel under various national specifications and select the material characteristics of steel suitable for this article;Use field simulation software FDS to simulate real fire scene for indoor temperature curve;Analyze the propagation characteristics of explosive load and the impact of explosive load peak factors.(2)Above is adopted to define the material model and constitutive relation.In view of the frame structure of a main bearing component framework(beam),use the finite element software ANSYS to simulate the dynamic response of frame steel under separate fire and single explosion.(3)On the basis of the above analysis,the dynamic response of the frame steel beam under the combined action of fire and explosion is considered,and the influence factors such as the length of the steel beam,the proportion distance,the bearing restraint and the load ratio are discussed under the combined action of fire and explosion Influence of dynamic response of frame steel beam. |
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