Effects of cyclic loading on the long-term deflection of prestressed concrete beams

Zhang, Lihai; Mendis, Priyan; Hon, Wong Chon; Fragomeni, Sam; Lam, Nelson; Song, Yilun

doi:10.12989/cac.2013.12.6.739

Cited by 14 publications

(7 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the effect of concrete mixes was not considered in this study. Moreover, in the engineering practice, most beam structures work with cracks, and the residual flexural capacity of beams is also affected by the long-term creep of concrete [48,49]. However, this study did not consider the coupling effect of long-term load, crack and corrosion.…”

Section: The Limitations Of the New Proposalmentioning

confidence: 98%

Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam

Wang

et al. 2020

Front. Struct. Civ. Eng.

View full text Add to dashboard Cite

In this study, a total of 177 flexural experimental tests of corroded reinforced concrete (CRC) beams were collected from the published literature. The database of flexural capacity of CRC beam was established by using unified and standardized experimental data. Through this database, the effects of various parameters on the flexural capacity of CRC beams were discussed, including beam width, the effective height of beam section, ratio of strength between longitudinal reinforcement and concrete, concrete compressive strength, and longitudinal reinforcement corrosion ratio. The results indicate that the corrosion of longitudinal reinforcement has the greatest effect on the residual flexural capacity of CRC beams, while other parameters have much less effect. In addition, six available empirical models for calculating the residual flexural strength of CRC beams were also collected and compared with each other based on the established database. It indicates that though five of six existing empirical models underestimate the flexural capacity of CRC beams, there is one model overestimating the flexural capacity. Finally, a newly developed empirical model is proposed to provide accurate and effective predictions in a large range of corrosion ratio for safety assessment of flexural failure of CRC beams confirmed by the comparisons.

show abstract

Section: The Limitations Of the New Proposalmentioning

confidence: 98%

Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam

Wang

et al. 2020

Front. Struct. Civ. Eng.

View full text Add to dashboard Cite

show abstract

“…Concrete bridge decks are most vulnerable components within the transportation infrastructure because they are subjected to continuous deterioration due to direct impact of repetitive heavy traffic loadings, thermal loadings, freeze and thaw cycles and various other ambient environmental conditions. [1][2][3][4] The major problem encountered by the reinforced concrete bridge decks is sub-surface delamination caused by the corrosion of steel reinforcing bars (rebar), which is more evident in the structures where de-icing chemicals are used on the surface. 5 The delamination can lead to local expansion of steel, imposing local stresses on concrete and ultimately triggering cracks along the rebars in concrete.…”

Section: Introductionmentioning

confidence: 99%

The influence of ambient environmental conditions in detecting bridge concrete deck delamination using infrared thermography (IRT)

Raja

Miramini

Duffield

et al. 2020

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

Summary Delamination is a serious form of deterioration in concrete bridge decks. Infrared thermography (IRT) is an advance non‐destructive testing method for concrete bridge deck delamination detection by capturing the absolute thermal contrast (ΔT) on the concrete surface caused by the disruption in heat flow due to subsurface defects. However, as the ambient environmental conditions (e.g. wind velocity and solar radiation) of a bridge could significantly affect the measurement outcomes of IRT, the optimal times for infrared data collection are still unclear. In this paper, a series of experimental and numerical studies were carried out to investigate the effects of the rate of heat flux and wind velocity on ΔT on the surface of bridge decks with the aim of identifying the optimal inspection times for different geometry characteristics of delamination (i.e. size and depth). The developed model is firstly validated by the experimental data and then a series of parametric studies were carried out. The result shows that the heat flux rate plays an important role in the development of ΔT on concrete surface, especially for a relatively shallow and small size delamination. However, the influence of heat flux rate gradually diminishes with the increase in size and depth of delamination. In addition, it demonstrates that there is a positive linear correlation between the total heat energy (external irradiation) and square of the delamination depth. The current research represents an important step towards the development of an effective and efficient way for defect detection using IRT.

show abstract

“…Both deterioration mechanisms cause damage accumulation over time (Maizuar et al, 2017, Sánchez-Silva andKlutke, 2016). Previous studies on progressive deterioration of reinforced concrete structures have focused on chloride ingress that results in steel reinforcement corrosion, concrete creep, cracking and loss of bond and spalling (Melchers et al, 2008, Zhang et al, 2013. Numerous research has been carried out on mathematical models for shock degra ation (Barlow andProschan, 1996, Nakagawa, 1985).…”

Section: Introductionmentioning

confidence: 99%

Reliability-Based Approach for Residual Life Prediction of Bridges Subjected to Earthquake Shocks Degradation

Maizuar

Akbar

Wesli

2019

View full text Add to dashboard Cite

Structural degradation caused by sudden damaging extreme events (e.g. earthquake) has significant impact on residual life of bridges and ultimately the collapse of bridges. This paper presents a reliability-based approach of a bridge subjected to shock degradation caused by earthquake events. In particular, this study develops a numerical procedure for assessing time dependent probability of failure to estimate the residual life a bridge. Key factors that govern the residual life of a bridge (e.g., damage size caused by earthquake shocks and loss of initial structural capacity) were investigated. The results of study show that both damage size caused by earthquake shocks and loss of initial structural capacity are key factors that govern residual life of a bridge. Keywords: residual life, earthquake, shock degradation, bridge.

show abstract

Effects of cyclic loading on the long-term deflection of prestressed concrete beams

Cited by 14 publications

References 16 publications

Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam

Novel empirical model for predicting residual flexural capacity of corroded steel reinforced concrete beam

The influence of ambient environmental conditions in detecting bridge concrete deck delamination using infrared thermography (IRT)

Reliability-Based Approach for Residual Life Prediction of Bridges Subjected to Earthquake Shocks Degradation

Contact Info

Product

Resources

About