Residual Life Assessment of Reinforced Concrete Considering Tension Softening Behaviour

2021 ◽  
pp. 305-312
Author(s):  
S. Ajimi ◽  
M. Simon Keerthy ◽  
J. Bharati Raj
Keyword(s):  
Reinforced Concrete ◽  
Residual Life ◽  
Life Assessment ◽  
Softening Behaviour ◽  
Tension Softening ◽  
Residual Life Assessment

scholarly journals A Review on Residual Life Assessment of Plain and Reinforced Concrete Members

2021 ◽  
Author(s):  
Ajimi S ◽  
Keerthy M Simon ◽  
Bharati Raj
Keyword(s):  
Reinforced Concrete ◽  
Residual Life ◽  
Process Zone ◽  
Maximum Amplitude ◽  
Fatigue Loading ◽  
Life Assessment ◽  
Moment Capacity ◽  
Strength Assessment ◽  
Fibre Bridging ◽  
Tension Softening

Under fatigue loading, concrete like quasi-brittle materials exhibit softening behaviour since an inelastic zone will be formed in front of the crack tip called the fracture process zone (FPZ). There are various toughening mechanisms that exhibiting in this region. Current design practices for reinforced concrete assumes a zero tensile strength for concrete which is actually overly conservative. In fact, concrete can bear significant tensile stress and strain. Therefore, the tension softening response of RC member should consider in the study. Under fatigue loading, strength and stiffness decrease progressively according to the maximum amplitude and the number of cycles of loading. Fracture plays an important role in failure of normally and lightly reinforced beam. Since FPZ mechanisms and fibre bridging action resist crack propagation, we have to consider these mechanisms while assessing remaining life of RC member. Fatigue failure occurs when applied load is much less than the moment capacity. Such structures susceptible to fatigue load need to be monitored and residual life is to be predicted. This paper is presenting a review on the residual strength assessment on plain and reinforced concrete. The review includes the influence of various tension-softening models in predicting the residual life of plain and reinforced concrete. A comparative study is also conducted in order to assess the residual life by considering various tension softening laws.

Residual service life estimation of bridges

2021 ◽  
Author(s):  
Mayank Bajaj ◽  
Biswajit Bhattacharjee
Keyword(s):  
Residual Life ◽  
Concrete Bridges ◽  
Life Assessment ◽  
Residual Service Life ◽  
Chloride Ingress ◽  
Service Life Estimation ◽  
Residual Life Assessment ◽  
Existing Bridges ◽  
Residual Service

<p>While concrete structures perform well in many situations, lack of durability has emerged as a significant issue for asset owners. A review of past bridge failures was done to identify the most probable causes of bridge failures. This study has tended to focus on current models used for estimating the time to deterioration of concrete bridges instigated by Chloride ingress and Fatigue. Subsequently, mathematical modelling of the best-suited deterioration model is done to arrive at the residual life of two existing bridges. This work has highlighted high variability in the parameters used to describe the durability related properties of in-situ aged concrete. A realistic residual life assessment can be achieved by correct evaluation of these parameters by periodic testing of bridge samples</p>

Criterial relationships for residual life assessment of materials

2006 ◽  
Vol 38 (4) ◽  
pp. 348-353 ◽  
Author(s):  
A. A. Lebedev ◽  
V. M. Mikhalevich
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Residual Life Assessment

Residual Life Assessment for Boiler Pressure Components Based on Measurements of Creep Strains

1988 ◽  
Vol 110 (3) ◽  
pp. 308-313 ◽  
Author(s):  
F. Mlynarski ◽  
J. Taler
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Strain Measurements ◽  
Years Of Service ◽  
Residual Life Assessment ◽  
Outside Diameter ◽  
Creep Strains

This paper discusses different methods for calculating the residual life for boiler pressure components operating under creep conditions, based on tube outside diameter strain measurements. These measurements were made for over 20 yr. The methods have been applied to the residual life calculation for pipelines of 20 or more years of service. Then the results have been compared.

scholarly journals Residual Life Assessment of Electricity Pylons – A Case Study

2009 ◽  
Vol 413-414 ◽  
pp. 219-228 ◽  
Author(s):  
John R. Maguire
Keyword(s):  
Structural Integrity ◽  
Residual Life ◽  
Life Assessment ◽  
Original Design ◽  
Integrity Assessment ◽  
Specific Safety ◽  
Residual Life Assessment ◽  
Independent Assessment ◽  
Overhead Power Line

This case study describes a structural integrity assessment of a 220 kV overhead power line. The line comprises 70 pylons over a distance of approximately 30 km, predominantly in a valley location. The pylons are spaced at intervals of approximately 400 m and each pylon is approximately 32 m in height. The line was originally constructed in the 1950’s, approximately 50 years prior to the requested structural integrity assessment. This paper describes the independent assessment that was carried out. The review established site-specific safety factors at the time of original design and construction; at the time of the review (2007), accounting for the possible presence of the “Thomasstahl” steel; and in the future, at the anticipated end of pylon life (in 2012).

A novel method for residual life assessment of used parts: a case study of used lathe spindles

2022 ◽  
Author(s):  
Dan Liu ◽  
Weijun Liu ◽  
Sidi Xu ◽  
Xingyu Jiang ◽  
Shilei Li ◽  
...  
Keyword(s):  
Residual Life ◽  
Life Assessment ◽  
Novel Method ◽  
Residual Life Assessment
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