空间结构静力稳定分析与评定的特征刚度法

发布时间：2018-06-22 08:22

本文选题：空间结构 + 稳定分析　；参考：《浙江大学学报(工学版)》2017年11期

【摘要】：为了直观反映稳定分析中结构整体性态的变化,解决荷载-位移曲线特征点的选取问题,提出特征刚度概念并导出计算公式,证明了特征刚度为零可以作为极值型屈曲结构稳定性临界状态的判定依据;结合增量累积的荷载功和结构特征位移,提出结构静力分析的全过程特征曲线,采用该曲线分析结构受载全过程中整体刚度的变化.选取一个K6型网壳和一个会议中心屋盖网壳,采用特征刚度法进行静力稳定分析,分析结果表明:计算得到的结构失稳临界荷载与基于单点荷载-位移曲线所得结果相同;相对于传统的单点荷载-位移曲线,特征曲线不依赖于结构特征点的选取,且形态稳定,可以直观反映结构整体刚度的特征.
[Abstract]:In order to reflect the change of structural integrity in stability analysis and solve the problem of selecting characteristic points of load-displacement curve, the concept of characteristic stiffness is put forward and the calculation formula is derived. It is proved that the zero characteristic stiffness can be used as the basis for judging the critical state of the stability of the buckling structure with extreme value, and the characteristic curve of the whole process of static analysis of the structure is proposed by combining the incremental cumulative load work and the characteristic displacement of the structure. The curve is used to analyze the change of the overall stiffness during the whole process of the structure being subjected to load. A K6 reticulated shell and a meeting-center latticed shell are selected for static stability analysis by means of characteristic stiffness method. The results show that the calculated critical load is the same as the one based on the single-point load-displacement curve. Compared with the traditional single point load-displacement curve, the characteristic curve does not depend on the selection of the structural feature points, and the shape is stable, which can directly reflect the characteristics of the overall stiffness of the structure.
【作者单位】：同济大学土木工程学院;
【基金】：国家自然科学基金资助项目(51378379)
【分类号】：TU311

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