Numerical Investigation on Detection of Prestress Losses in a Prestressed Concrete Slab by Modal Analysis

3rd International Conference on Innovative Materials, Structures and Technologies

Kovalovs, A.^1 ; Rucevskis, S.^1 ; Akishin, P.^1 ; Kolupajevs, J.^2

Institute of Materials and Structures, Riga Technical University, Riga, Latvia^1

Finnmap Latvia, Riga, Latvia^2

关键词: 3-D finite element method;    ANSYS software;    Modal frequency;    Modal parameters;    Numerical investigations;    Numerical results;    Precast hollow core slabs;    Properties of concretes;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/251/1/012090/pdf
DOI  :  10.1088/1757-899X/251/1/012090

来源: IOP

【 摘 要 】

The paper presents numerical results of loss of prestress in the reinforced prestressed precast hollow core slabs by modal analysis. Loss of prestress is investigated by the 3D finite element method, using ANSYS software. In the numerical examples, variables initial stresses were introduced into seven-wire stress-relieved strands of the concrete slabs. The effects of span and material properties of concrete on the modal frequencies of the concrete structure under initial stress were studied. Modal parameters computed from the finite element models were compared. Applicability and effectiveness of the proposed method was investigated.