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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Structural Monitoring and Maintenance
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Volume 3, Issue 3 - Sep 2016
Volume 3, Issue 2 - Jun 2016
Volume 3, Issue 1 - Mar 2016
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Detection of structural damage via free vibration responses by extended Kalman filter with Tikhonov regularization scheme
Zhang, Chun ; Huang, Jie-Zhong ; Song, Gu-Quan ; Dai, Lin ; Li, Huo-Kun ;
Structural Monitoring and Maintenance, volume 3, issue 2, 2016, Pages 115~127
DOI : 10.12989/smm.2016.3.2.115
It is a challenging problem of assessing the location and extent of structural damages with vibration measurements. In this paper, an improved Extended Kalman filter (EKF) with Tikhonov regularization is proposed to identify structural damages. The state vector of EKF consists of the initial values of modal coordinates and damage parameters of structural elements, therefore the recursive formulas of EKF are simplified and modal truncation technique can be used to reduce the dimension of the state vector. Then Tikhonov regularization is introduced into EKF to restrain the effect of the measurement noise for improving the solution of ill-posed inverse problems. Numerical simulations of a seven-story shear-beam structure and a simply-supported beam show that the proposed method has good robustness and can identify the single or multiple damages accurately with the unknown initial structural state.
Existing concrete dams: loads definition and finite element models validation
Colombo, Martina ; Domaneschi, Marco ; Ghisi, Aldo ;
Structural Monitoring and Maintenance, volume 3, issue 2, 2016, Pages 129~144
DOI : 10.12989/smm.2016.3.2.129
We present a methodology to validate with monitoring data finite element models of existing concrete dams: numerical analyses are performed to assess the structural response under the effects of seasonal loading conditions, represented by hydrostatic pressure on the upstream-downstream dam surfaces and thermal variations as recorded by a thermometers network. We show that the stiffness effect of the rock foundation and the surface degradation of concrete due to aging are crucial aspects to be accounted for a correct interpretation of the real behavior. This work summarizes some general procedures developed by this research group at Politecnico di Milano on traditional static monitoring systems and two significant case studies: a buttress gravity and an arch-gravity dam.
Pulse-Pre Pump Brillouin Optical Time Domain Analysis-based method monitoring structural multi-direction strain
Su, Huaizhi ; Yang, Meng ; Wen, Zhiping ;
Structural Monitoring and Maintenance, volume 3, issue 2, 2016, Pages 145~155
DOI : 10.12989/smm.2016.3.2.145
The Pulse-Pre Pump Brillouin Optical Time Domain Analysis (PPP-BOTDA) technique is introduced to implement the multi-direction strain measurement. The monitoring principle is stated. The layout scheme of optical fibers is proposed. The temperature compensation formula and its realizing method are given. The experiments, under tensile load, combined bending and tensile load, are implemented to validate the feasibility of the proposed method. It is shown that the PPP-BOTDA technique can be used to discriminate the multi-direction strains with high spatial resolution and precision.
Multi-dimensional seismic response control of offshore platform structures with viscoelastic dampers (I-Theoretical analysis)
He, Xiao-Yu ; Li, Hong-Nan ; Zhang, Jun ;
Structural Monitoring and Maintenance, volume 3, issue 2, 2016, Pages 157~174
DOI : 10.12989/smm.2016.3.2.157
Based on classical viscoelastic damper, a brand-new damper is designed by the change of simple construction to implement vibration control for both translational vibration and rotational vibration simultaneously. Theoretic analysis has been carried out on the restoring force model and the control parameters. Two improved models are presented to obtain high simulation precision. The influence of the size, shape of the viscoelastic material, the ambient temperature and the response frequency on the vibration control effect is analyzed. The numerical results show that the new type viscoelastic damper is capable of mitigating the multi-dimensional seismic response of offshore platform and the response control effect has complicated relations with aforementioned related factors.
Multi-dimensional seismic response control of offshore platform structures with viscoelastic dampers (II-Experimental study)
He, Xiao-Yu ; Zhao, Tie-Wei ; Li, Hong-Nan ; Zhang, Jun ;
Structural Monitoring and Maintenance, volume 3, issue 2, 2016, Pages 175~194
DOI : 10.12989/smm.2016.3.2.175
Based on the change of traditional viscoelastic damper structure, a brand-new damper is designed to control simultaneously the translational vibration and the rotational vibration for platforms. Experimental study has been carried out on the mechanical properties of viscoelastic material and on its multi-dimensional seismic response control effect of viscoelastic damper. Three types of viscoelastic dampers with different shapes of viscoelastic material are designed to test the influence of excited frequency, strain amplitude and ambient temperature on the mechanical property parameters such as circular dissipation per unit, equivalent stiffness, loss factor and storage shear modulus. Then, shaking table tests are done on a group of single-storey platform systems containing one symmetric platform and three asymmetric platforms with different eccentric forms. Experimental results show that the simulation precision of the restoring force model is rather good for the shear deformation of viscoelastic damper and is also satisfied for the torsion deformation and combined deformations of viscoelastic damper. The shaking table tests have verified that the new-type viscoelastic damper is capable of mitigating the multi-dimensional seismic response of offshore platform.