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Steel and Composite Structures
  Volume 18, Number 4, April 2015 , pages 811-831

Strengthening of perforated walls in cable-stayed bridge pylons with double cable planes
Bin Cheng, Jie Wu and Jianlei Wang

    This paper focuses on the strengthening methods used for improving the compression behaviors of perforated box-section walls as provided in the anchorage zones of steel pylons. Rectangular plates containing double-row continuous elliptical holes are investigated by employing the boundary condition of simple supporting on four edges in the out-of-plane direction of plate. Two types of strengthening stiffeners, named flat stiffener (FS) and longitudinal stiffener (LS), are considered. Uniaxial compression tests are first conducted for 18 specimens, of which 5 are unstrengthened plates and 13 are strengthened plates. The mechanical behaviors such as stress concentration, out-of-plane deformation, failure pattern, and elasto-plastic ultimate strength are experimentally investigated. Finite element (FE) models are also developed to predict the ultimate strengths of plates with various dimensions. The results of FE analysis are validated by test data. The influences of non-dimensional parameters including plate aspect ratio, hole spacing, hole width, stiffener slenderness ratio, as well as stiffener thickness on the ultimate strengths are illustrated on the basis of numerous parametric studies. Comparison of strengthening efficiency shows that the continuous longitudinal stiffener is the best strengthening method for such perforated plates. The simplified formulas used for estimating the compression strengths of strengthened plates are finally proposed.
Key Words
    steel pylon; double cable planes; perforated plate; elliptical hole; strengthening method; uniaxial compression
(1) Bin Cheng, Jianlei Wang:
Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
(2) Jie Wu:
College of Civil Engineering, Tongji University, Shanghai 200092, China;
(3) Bin Cheng:
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.

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