Effect of damaged circular flange-bolted connections on behaviour of tall towers, modelled by multilevel substructuring

Błachowski, Bartłomiej; Gutkowski, W.

doi:10.1016/j.engstruct.2015.12.018

Cited by 49 publications

(23 citation statements)

References 20 publications

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“…Methods from the second group have been investigated by An et al [17], who utilized QR decomposition to detect changes in the flexibility matrix based on measured modes, or by Blachowski et al [18] for detection of damage in a bolted lap connection. Damage in flanged connections of tall steel towers was the topic of the paper by Blachowski and Gutkowski [19]. Recently, a time domain technique for simultaneous sensor placement and damage identification in truss structures has been proposed by Blachowski et al [20].…”

Section: Introductionmentioning

confidence: 99%

Modal Sensitivity Based Sensor Placement for Damage Identification Under Sparsity Constraint

Błachowski

2019

Period. Polytech. Civil Eng.

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The present study deals with a comprehensive approach for damage identification of spatial truss structures. The novelty of the proposed approach consists of a three-level analysis. First, sensitivity of assumed modal characteristics is calculated. Second, natural frequency sensitivity is used to determine hardly identifiable structural parameters and mode shape sensitivity is applied to select damage-sensitive locations of sensors. Third, two sparsity constrained optimization algorithms are tested towards efficient identification of applied damage scenarios. These two algorithms are based on ℓ1-norm minimization and non-negative least square (NNLS) solution.Performances of both proposed algorithms have been compared in two realistic case studies: the first one concerned a three-dimensional truss girder with 61 structural parameters and the second one was devoted to an upper-deck arch bridge composed of 416 steel members.

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Section: Introductionmentioning

confidence: 99%

Modal Sensitivity Based Sensor Placement for Damage Identification Under Sparsity Constraint

Błachowski

2019

Period. Polytech. Civil Eng.

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“…Each segment is pre-fabricated individually and then connected together by applying the CFBC on site. Since the joints are the main component that transfers the vertical and lateral loads therefore, a lot of attention is concentrated on the mechanical behavior of CFBC and its effect on the entire structure [7]. Cao and Bell [8] have discussed on the prying effect arising from these kinds of joints.…”

Section: Introductionmentioning

confidence: 99%

The Performance Evaluation of Circular Flange Bolted Connection in Ultra High Performance Fiber Reinforced Concrete Segmented Communication Tower

Hashim

Hejazi

Jaafar

et al. 2019

Period. Polytech. Civil Eng.

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This study herein presents investigations about behavior of circular flange bolted connection (CFBC) in ultra high performance fiber reinforced concrete (UHPFRC) hollow segmented communication tower subjected to lateral dynamic load. The CFBC consists of two flanged concrete, cast together with the structural segment tubes and then connected using steel bolts. The paper is illustrated with CFBC joint of 500mm flange thicknesses, and 8M25 high strength steel bolts coming from a typical real design tower. For this purpose, the full scale CFBC joints for communication tower are made from Ultra High Performance Fiber Reinforced Concrete (UHPFRC). The connection was cast and experimentally tested by applying cyclic lateral load using dynamic actuator. The lateral strength and stiffness resistance of the UHPFRC CFB connections were evaluated in this study. Besides, a rigorous FEM analysis was executed in order to evaluate the performance of CFBC in the communication tower by investigating the mechanism of force transfer, load bearing capacity as well as failure behavior of the circular flange bolted connection (CFBC) under lateral cycling loading. The experimental and numerical analysis results showed the ability of UHPFRC circular bolted connection to resist the applied lateral loads. In addition, the considered model revealed that for joints under tension, bolts were seriously not subjected to bending moments which is due to the prying effect. This was made possible by the provision of adequate flange thickness and strength of the UHPFRC material.

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“…Previous reviews of the literature on wind turbine optimization [12,13] have focused on the optimization of utilityscale wind turbines rather than SWTs. In many works, wind turbine tower optimization for utility-scale wind turbines is discussed [14][15][16][17][18][19][20]. This also applies to wind turbine blade optimization for utility-scale wind turbines [21][22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Evolutionary computing methodology for small wind turbine supporting structures

Bukała

Damaziak

Karimi

et al. 2018

Int J Adv Manuf Technol

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The paper presents a comprehensive, complex, numerical, optimization methodology (computational framework) dedicated for supporting structures of small-scale wind turbines. The small wind turbine (SWT) supporting structure is one of the key components determining the cost of such a device. Therefore, the supporting structure optimization will allow cost reduction and, hence, popularization of these devices around the world. The presented methodology is based on the following: single-objective (aggregationapproach to multi-objective problem) evolutionary algorithm driven optimization, finite-element structural analyses, estimation of wind energy capture efficiency (coupled aero-servo-elastic numerical simulations), and economic evaluation (based on real meteorological data). Then, the methodology is proposed for a guy-wired mast structure of an arbitrary chosen SWT model. The optimization of chosen design features of the structure is performed and as a result the optimal solution for given assumptions is presented and scaling factor for that case is identified (total mass of the foundations). The successful use of combined numerical methods (genetic algorithms, FE method analyses, coupled aero-servo-elastic numerical simulations, pre-/post-processing scripts, and economic evaluation models) is the main novelty of this work.

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Effect of damaged circular flange-bolted connections on behaviour of tall towers, modelled by multilevel substructuring

Cited by 49 publications

References 20 publications

Modal Sensitivity Based Sensor Placement for Damage Identification Under Sparsity Constraint

Modal Sensitivity Based Sensor Placement for Damage Identification Under Sparsity Constraint

The Performance Evaluation of Circular Flange Bolted Connection in Ultra High Performance Fiber Reinforced Concrete Segmented Communication Tower

Evolutionary computing methodology for small wind turbine supporting structures

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