Behavior of Circular Fiber-Reinforced Polymer–Steel-Confined Concrete Columns Subjected to Reversed Cyclic Loads: Experimental Studies and Finite-Element Analysis

Wang, Yanlei; Cai, Gaochuang; Li, Y.; Waldmann, Danièle; Larbi, Amir Si; Tsavdaridis, Konstantinos Daniel

doi:10.1061/(asce)st.1943-541x.0002373

Cited by 98 publications

(24 citation statements)

References 39 publications

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“…Structural dynamic characteristics are often used to detect damage by assessing their changes between an intact structure and a damaged structure. Structural modal parameters, such as natural frequencies, mode shapes, modal mass and stiffness, are popular as dynamic indices for damage identification [16][17][18][19], and are easily obtained due to the rapid development of experiment modal analysis techniques. For example, Wang et al [20] extracted the fundamental frequency of a bridge from the responses of an ordinary vehicle with its parameters calibrated in advance.…”

Section: Introductionmentioning

confidence: 99%

Bridge Damage Identification Using Vehicle Bump Based on Additional Virtual Masses

Zhang

Hou

Jankowski

2020

Sensors

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Structural damage identification plays an important role in providing effective evidence for the health monitoring of bridges in service. Due to the limitations of measurement points and lack of valid structural response data, the accurate identification of structural damage, especially for large-scale structures, remains difficult. Based on additional virtual mass, this paper presents a damage identification method for bridges using a vehicle bump as the excitation. First, general equations of virtual modifications, including virtual mass, stiffness, and damping, are derived. A theoretical method for damage identification, which is based on additional virtual mass, is formulated. The vehicle bump is analyzed, and the bump-induced excitation is estimated via a detailed analysis in four periods: separation, free-fall, contact, and coupled vibrations. The precise estimation of bump-induced excitation is then applied to a bridge. This allows the additional virtual mass method to be used, which requires knowledge of the excitations and acceleration responses in order to construct the frequency responses of a virtual structure with an additional virtual mass. Via this method, a virtual mass with substantially more weight than a typical vehicle is added to the bridge, which provides a sufficient amount of modal information for accurate damage identification while avoiding the bridge overloading problem. A numerical example of a two-span continuous beam is used to verify the proposed method, where the damage can be identified even with 15% Gaussian random noise pollution using a 1-degree of freedom (DOF) car model and 4-DOF model.

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Section: Introductionmentioning

confidence: 99%

Bridge Damage Identification Using Vehicle Bump Based on Additional Virtual Masses

Zhang

Hou

Jankowski

2020

Sensors

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“…FRP composites have found increasing applications in civil engineering, both in the retrofitting of existing reinforced concrete structures (e.g., bonding FRP composites to concrete beams to enhance their bending strength or shear strength; wrapping FRP composites on concrete columns to improve their ductility under seismic loading) and in the construction of new structures incorporating with FRP (e.g., FRP decks for footbridges; FRP domes for radar equipment; concrete-filled FRP tubes as bridge piles) [1][2][3]. Extensive studies have been conducted to explore the possibilities of constructing new structures using FRP composites [4][5][6][7], in which traditional materials (e.g., concrete and steel) are combined with FRP composites to create novel hybrid structures. e word hybrid rather than composite is used here to indicate the combined use of traditional materials and FRP composites to prevent any confusion or misunderstanding as FRP itself is a composite material consisting of both fibers and resin matrix.…”

Section: Introductionmentioning

confidence: 99%

Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression

Zhang

Feng

Wang

et al. 2020

Advances in Polymer Technology

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Hybrid FRP-concrete-steel double-skin tubular columns (hybrid DSTCs) are a novel form of hollow columns consisting of an outer FRP tube, an inner steel tube, and an annular layer of concrete between the two tubes. Due to the effective confinement of the two tubes, the concrete in hybrid DSTCs is well confined, leading to excellent ductility and strength enhancement. Hybrid DSTCs also have excellent corrosion resistence due to the effective protection of the outer FRP tube. However, existing studies mainly focused on hybrid DSTCs with a circular cross-section. When subjecting to different loads in the two horizontal directions, elliptical columns are preferred as they can provide different bending stiffness and moment capacity around two axes of symmetry without significantly reducing the confining effect of the FRP tube. This paper extends the existing work on circular DSTCs to elliptical DSTCs with a particular focus on four issues: the effect of elliptical aspect ratio (i.e., the ratio of the major axis to the minor axis of the outer elliptical cross-section), the effect of the FRP tube thickness, the effect of void area ratio (i.e., the ratio of the area of concrete void to the area of the outer elliptical section), and the effect of the cross-section of the inner steel tube (i.e., both rectangular and elliptical steel tubes were used). Experimental results show that, the averaged peak stress of the confined concrete in elliptical DSTCs increases with the increase in the elliptical aspect ratio, whereas the elliptical aspect ratio has no obvious effect on the ultimate axial strain; the cross-section shape of the inner steel tube has significant effect on the axial stress-strain behavior of the confined concrete in elliptical DSTCs; elliptical DSTCs with an elliptical steel tube exhibit much better ductility and strength enhancement than those specimens with a rectangular steel tube. A simple stress-strain model of confined concrete was proposed for elliptical DSTCs to account for the effects of the elliptical aspect ratio, the inner void, and the shape of the inner steel tube, which can provide reasonably accurate but conservative predictions.

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“…Furthermore, the outer FRP tube offers additional confinement to the concrete core. Many researches (e.g., [24][25][26][27][28][29][30]) have been carried out on the axial compressive behavior of CFFT columns, which demonstrated the excellent structural performance of such members. However, the majority of the reinforcing fibers in current FRP belong to synthetic fibers (e.g., carbon and glass fibers), which will consume large amounts of energy.…”

Section: Introductionmentioning

confidence: 99%

Compressive Behavior of Circular Sawdust-Reinforced Ice-Filled Flax FRP Tubular Short Columns

et al. 2020

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Sawdust-reinforced ice-filled flax fiber-reinforced polymer (FRP) tubular (SIFFT) columns are newly proposed to be used as structural components in cold areas. A SIFFT column is composed of an external flax FRP tube filled with sawdust-reinforced ice. The compressive behavior of circular SIFFT short columns was systematically investigated. Four types of short columns with circular sections, including three plain ice specimens, three sawdust-reinforced ice specimens (a mixture of 14% sawdust and 86% ice in weight), nine plain ice-filled flax FRP tubular (PIFFT) specimens and nine SIFFT specimens, were tested to assess the concept of the innovative composite columns. The test variables were the thickness of flax FRP tubes and the type of ice cores. The test results indicated that the lateral dilation and the development of cracks of the ice cores were effectively suppressed by outer flax FRP tubes, thus causing a considerable enhancement in the compressive strength. Moreover, the compressive behavior, energy-absorption capacity, and anti-melting property of sawdust-reinforced ice cores were better than those of plain ice cores confined by flax FRP tubes with the same thicknesses. The proposed equations for estimating ultimate bearing capacities of PIFFT and SIFFT short columns were shown to provide reasonable and accurate predictions.

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Behavior of Circular Fiber-Reinforced Polymer–Steel-Confined Concrete Columns Subjected to Reversed Cyclic Loads: Experimental Studies and Finite-Element Analysis

Cited by 98 publications

References 39 publications

Bridge Damage Identification Using Vehicle Bump Based on Additional Virtual Masses

Bridge Damage Identification Using Vehicle Bump Based on Additional Virtual Masses

Elliptical FRP-Concrete-Steel Double-Skin Tubular Columns under Monotonic Axial Compression

Compressive Behavior of Circular Sawdust-Reinforced Ice-Filled Flax FRP Tubular Short Columns

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