【摘要】 研究目的:结构倒塌破坏的研究引起了许多学者的高度关注。本文在已有试验模型和结果的基础上,研究钢框架组合结构在冲击荷载作用下的倒塌临界条件和预防倒塌措施,为防止结构倒塌研究提供参考。研究方法:用LS-DYNA有限元软件对模型结构的冲击倒塌进行了仿真分析,与试验结果的对比验证其可行性。并采用相同方法分析了96组不同梁跨度的试验模型,用MATLAB回归出了结构倒塌的临界挠度简化计算公式。最后,采用ABAQUS有限元软件模拟分析防倒塌措施的效果。研究结果:试验模型的有限元模拟分析结果与试验结果吻合较好,回归得出了结构倒塌的临界挠度计算公式,采用了本文提出的防倒塌措施的可显著提高结构倒塌的临界挠度。研究结论:本文采用的冲击倒塌仿真分析方法可行,得出的结构倒塌临界挠度计算公式精度较高,提出的防倒塌措施有效。更多还原

【Abstract】 Research purposes: The study of the collapse and destruction of structures has been paid close attention widely.Based on an existent test model and its results,this paper proposed the critical condition of collapse and the(corresponding) protective methods when the impact load was acted on the steel frame-RC tube structures.It provided a guide for the research about the collapse of structure.Research methods:A simulation analysis of the impact and collapse of the model structure with finite element software LS-DYNA was carried out.The analysis methfod was feasible after compared the results of the simulation analysis to the results of the test.Then,this paper analyzed 96 groups of the steel frame-RC tube structures using the same(method),and formulated a simplified formula of the critical deflection for collapse using MATLAB.Finally,simulation(analysis) for the structure with protective measure against collapse was took with finite element software ABAQUS.Research results:The results of the simulation analysis and the test were basically consistent.This paper returned the simplified formula of the critical deflection for collapse.The protective measure against collapse can significantly(decrease) the critical deflection for collapse of the structures.Research conclusions:The method of the simulation analysis for the structure acted the impact load was feasible.The simplified formula was took,which calculated accurately for the critical deflection for collapse.The results of the(simulation) analysis proved the measure against collapse to be valid.更多还原