结构安全性评定及加固既有网壳结构显著构件损伤识别方法

吴俊

doi:10.13204/j.gyjzG23012910

结构安全性评定及加固既有网壳结构显著构件损伤识别方法

doi: 10.13204/j.gyjzG23012910

吴俊

同恩(上海)工程技术有限公司, 上海 200433

基金项目:

作者:吴俊,男,1993年出生,工程师。电子信箱: jayfore@163.com

详细信息

作者简介:
吴俊,男,1993年出生,工程师。电子信箱:jayfore@163.com

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- 被引次数: 0
出版历程
- 收稿日期: 2023-01-29

Damage Identification Method for Significant Members of Existing Latticed Shells

WU Jun

Tongen (Shanghai) Engineering Technology Co., Ltd., Shanghai 200433, China

摘要

摘要: 针对既有网壳结构损伤构件位置分布难以完全测定的问题,提出了一种用于既有网壳结构显著损伤构件识别的改进残余力分解法(RFD)。基于定义的沿构件轴向投影方向上的无量纲模态变形参数,将所测得的特征向量采用RFD方法转化为一组多元线性方程组,用以定位具有显著刚度折减的构件。针对方程组可能存在无穷解的情况,利用Ritz向量的灵敏度分析和模态保证准则(MAC)进行网壳结构构件重要性判定,筛选出在当前荷载模式下对结构刚度贡献最小的构件,将其作为附加约束条件引入计算方程,使方程组具备唯一解的条件。同时建立了网壳结构模型进行计算分析,详述了RFD方法的计算过程并验证了其有效性。
- 既有网壳结构 /
- 损伤构件识别 /
- 残余力分解法 /
- 构件重要性
Abstract: For the problem that it is difficult to completely determine the damage location distribution of the existing latticed shell, a practical residual force decomposition (RFD) method was proposed to identify significantly damaged members in the existing latticed shell. In the proposed RFD method, the significant damage can be recognized corresponding to the changes of the observed eigenvector based on the non-dimensional modal deformation parameters defined in the paper along the axial projection direction of members, which can be transformed into solving a set of multivariate linear equations. To deal with the possibility of infinite solutions in the equation system, the sensitivity analysis of Ritz vectors and the Modal Assurance Criterion (MAC) were employed to assess the importance of members in latticed shell structures. The members with minimal contribution to the structural stiffness under the current loading condition were selected and introduced as additional constraint conditions in the calculation equations, ensuring the uniqueness of the solution to the equation system. A latticed shell structural model was established for computational analysis, and the calculation process of the RFD method in the paper was described in detail and its effectiveness was verified.
- existing latticed shell /
- damage identification /
- residual force decomposition /
- member importance

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