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Indexed by:会议论文

Date of Publication:2007-01-01

Included Journals:CPCI-S

Page Number:146-151

Key Words:optimal sensor placement (OSP); finite element method (FEM); modal assurance criterion; (MAC); series of multidegree-of freedom; high-rise building

Abstract:Deciding on an optimal sensor placement is a common problem encountered in many engineering applications and is a critical issue in the construction and implementation of an effective structural health monitoring system. In this paper, an initial three-dimensional finite element model for the Dalian World Trade building was established using ETABS software. Since the number of degree-of-freedom of the structure is too much, multi-modes should be selected to describe the dynamic behavior of a structural system with sufficient accuracy to allow its health state to be determined effectively. A difficult problem in analysis is how to accurately select the translational and torsional modes. For this, a new method computing the mode shape matrix of weak axis by simplified series multidegree-of-freedom system is presented based on the equivalent rigidity parameter identification method. The initial sensor assignment is obtained by the QR-factorization of the structural mode shape matrix. Taking the maximum off-diagonal element of the modal assurance criterion matrix as a target function, adds one more sensor each time until the maximum off-diagonal element of MAC reaches the threshold. Considering the economic factors, the final plan of sensor placement is determined.