【摘要】 采用ANSYS软件对某大跨度飞艇库网壳结构建立了有限元分析模型,进行结构静力分析、模态分析和时程分析。通过静力分析得到结构在恒载和活载作用下的竖向变形,检验了结构挠度;通过模态分析得到结构前十阶振动模态,分析了结构整体工作性能;通过在三条地震波激励下的时程分析得到结构分别在小震、中震和大震下的位移反应、基底剪力和关键部位的部分关键杆件的应力。分析结果表明:结构变形较为均匀且符合变形限值要求;结构振动模态以整体振动为主,没有出现明显的局部振动振型,设计方案合理;格构柱-拱交接处杆件内力较大,杆件内力组合值未达到材料屈服强度,符合设计要求。更多还原

【Abstract】 With the help of ANSYS,a finite element analytical model of a latticed shell of a large-span airship hangar was established for structural static analysis,modal analysis and time-history analysis.The structural static analysis revealed the vertical deformation of the structure under the combined action of dead load and live load and verified the structural deflection.The modal analysis demonstrated the top ten order vibration modes and the overall working performances of the structure.The time-history analysis under the excitation of three seismic waves showed the displacement response,base shear and stress of some key bars in key positions of the structure under minor,moderate,and strong earthquakes.The results indicate that the structural deformation is uniform and meets the deformation limit requirements.Whole vibration is the most common structural vibration mode and no obvious local vibration mode occurs,which suggests that the design is reasonable.The internal bar force is bigger at the column-arch joints of the latticed shell and the combination value of internal bar force does not reach the material yield strength,which proves that it meets the design requirements.更多还原