In Situ Data Analysis for Condition Assessment of an Existing Prestressed Concrete Bridge

Gunawardena, Yasoja; Aslani, Farhad; Li, Jun; Hao, Hong

doi:10.1061/(asce)as.1943-5525.0000935

Cited by 10 publications

(10 citation statements)

References 25 publications

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“…erefore, it can be concluded that the strength reduction of the SWS single defect had almost no effect on the CFST bearing capacity when the internal concrete had no defects. is is certificated by the observations of previous experiences in Gunawardena and Aslani [2] and Gunawardena et al [3].…”

Section: N-ε Curves Of Cfst Rib With or Without Sws-s Defectmentioning

confidence: 73%

“…A comparison between the experimental data of Gunawardena et al [3], Liao et al [24,25], and the FEM analysis results was carried out to verify the FEM rationality of this bridge rib. It can be observed that the ribs with decreased SWS strength or a single defect of air void generally exhibited outward local buckling for the steel tubes at the SWS defect, while the overall lateral deflection at midheight was also observed.…”

Section: General Conditionsmentioning

confidence: 99%

“…For a CFST rib with air void defect, it appears that the air void rate is a decisive factor affecting the rib bearing capacity. ere has been no SWS-S defect research thus far, and the SWSs studied by Gunawardena and Aslani [2] and Gunawardena et al [3] were standard welds that met the design requirements and had no defects. However, the arch rib element SWSs of this bridge is defective.…”

Section: General Conditionsmentioning

confidence: 99%

“…Meanwhile, owing to the limitations of technical levels over 20 years ago, the spiral-welded seam (SWS) only penetrated 70%. Many tests have been conducted on concrete-filled SWT columns, considering short and long column behavior, to estimate the applicability of existing guidelines for evaluating their strength and failure types [2,3]. erefore, for the accurate evaluation of the bearing capacity of the Chang-Qing Hun River Bridge, the impact of SWS should be studied in depth.…”

Section: Introductionmentioning

confidence: 99%

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Effects of SWS Strength and Concrete Air Void Composite Defects on Performance of CFST Arch Bridge Rib

Guo

2020

Mathematical Problems in Engineering

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Most large-diameter concrete-filled steel tube (CFST) arch bridges adopt spiral-welded steel tubes for technical and economic reasons. However, during the steel tube manufacturing process, the welding temperature and other factors lead to a decreased spiral-welded seam (SWS) strength initially. Furthermore, for the CFST arch bridges using ordinary concrete, the laitance and air void defects inevitably appear, especially 20 years ago when there was no air-entraining agent in China. This paper presents a group of scale model experiments and finite element model analysis of the bearing capacity of a serviced CFST arch bridge rib with decreased SWS strength and concrete air void composite defects, under small eccentric axial compression on ultrasonic scanning field data. Parametric analyses were also performed to investigate the influence of the air void and SWS strength on the bearing capacity of the rib. Finally, a new ultimate strength index of the rib with composite defects was proposed, and a simplified formula was presented to estimate the effects of the air void and SWS strength decrease on the ultimate strength of the CFST arch bridge rib.

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Section: N-ε Curves Of Cfst Rib With or Without Sws-s Defectmentioning

confidence: 73%

Section: General Conditionsmentioning

confidence: 99%

Section: General Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effects of SWS Strength and Concrete Air Void Composite Defects on Performance of CFST Arch Bridge Rib

Guo

2020

Mathematical Problems in Engineering

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“…Chen et al (2018) investigate structural safety evaluation of in-service tunnels based on an adaptive neurofuzzy inference system (ANFIS). Gunawardena et al (2018) conducted purely data-based investigations to explore the feasibility of using several condition indicators to identify any changes occurring to the bridge condition.…”

mentioning

confidence: 99%

Damage Detection and Condition Assessment of Civil Structures

2020

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Bridge influence line identification from structural dynamic responses induced by a high‐speed vehicle

Yang

et al. 2020

Struct Control Health Monit

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Summary The bridge influence line can reflect the structural behavior under moving vehicle loads, which is becoming a proposing tool to study the bridge behavior during service life. A high‐speed vehicle will induce dynamic effect on the bridge, which will significantly change the shape of response curve. It is essential to consider the dynamic response for the accurate identification of the bridge influence line. This paper firstly summarizes current research activities for bridge influence line identification and components of the bridge dynamic responses. A dynamic fluctuation part elimination method based on empirical mode decomposition is proposed, based on which the bridge static influence line is identified by static bridge influence line identification method. Finally, a vehicle–bridge coupling model of a simply supported beam excited by passing vehicles with three different speeds is introduced to illustrate the effectiveness of the proposed identification method. The result of this study provides an effective identification method of the bridge static influence line, which can lead to a satisfactory identification results based on the dynamic responses induced by high‐speed vehicle loads.

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In Situ Data Analysis for Condition Assessment of an Existing Prestressed Concrete Bridge

Cited by 10 publications

References 25 publications

Effects of SWS Strength and Concrete Air Void Composite Defects on Performance of CFST Arch Bridge Rib

Effects of SWS Strength and Concrete Air Void Composite Defects on Performance of CFST Arch Bridge Rib

Damage Detection and Condition Assessment of Civil Structures

Bridge influence line identification from structural dynamic responses induced by a high‐speed vehicle

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