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Smart Structures and Systems
  Volume 15, Number 1, January 2015, pages 099-117
DOI: http://dx.doi.org/10.12989/sss.2015.15.1.099
 


Structural health rating (SHR)-oriented 3D multi-scale finite element modeling and analysis of Stonecutters Bridge
X.F. Li, Y.Q. Ni, K.Y. Wong and K.W.Y. Chan

 
Abstract
    The Stonecutters Bridge (SCB) in Hong Kong is the third-longest cable-stayed bridge in the world with a main span stretching 1,018 m between two 298 m high single-leg tapering composite towers. A Wind and Structural Health Monitoring System (WASHMS) is being implemented on SCB by the Highways Department of The Hong Kong SAR Government, and the SCB-WASHMS is composed of more than 1,300 sensors in 15 types. In order to establish a linkage between structural health monitoring and maintenance management, a Structural Health Rating System (SHRS) with relevant rating tools and indices is devised. On the basis of a 3D space frame finite element model (FEM) of SCB and model updating, this paper presents the development of an SHR-oriented 3D multi-scale FEM for the purpose of load-resistance analysis and damage evaluation in structural element level, including modeling, refinement and validation of the multi-scale FEM. The refined 3D structural segments at deck and towers are established in critical segment positions corresponding to maximum cable forces. The components in the critical segment region are modeled as a full 3D FEM and fitted into the 3D space frame FEM. The boundary conditions between beam and shell elements are performed conforming to equivalent stiffness, effective mass and compatibility of deformation. The 3D multi-scale FEM is verified by the in-situ measured dynamic characteristics and static response. A good agreement between the FEM and measurement results indicates that the 3D multi-scale FEM is precise and efficient for WASHMS and SHRS of SCB. In addition, stress distribution and concentration of the critical segments in the 3D multi-scale FEM under temperature loads, static wind loads and equivalent seismic loads are investigated. Stress concentration elements under equivalent seismic loads exist in the anchor zone in steel/concrete beam and the anchor plate edge in steel anchor box of the towers.
 
Key Words
    Structural health rating (SHR) system; Stonecutters Bridge; cable-stayed bridge; multi-scale finite element model (FEM)
 
Address
X.F. Li:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong;
Institute of Road and Bridge Engineering, Dalian Maritime University, Dalian, China
Y.Q. Ni:Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University,
Kowloon, Hong Kong
K.Y. Wong: Formerly Bridges and Structures Division, Highways Department, The Hong Kong Special Administrative Region, Hong Kong
K.W.Y. Chan: Bridges and Structures Division, Highways Department, The Hong Kong Special Administrative Region,
Hong Kong
 

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