Simulation and Behavior of Corrosion Deteriorated Reinforced Concrete Members

Several reinforced concrete (RC) infrastructures are now crumbling from corrosion of steel bars in concrete. The paper presents the recent advancements in analytical simulation of corrosion aftereffects on behavior of RC members. The model juxtaposes the experimental findings with analytical relationships. The implementation of the model into a nonlinear finite element formulation as well as the experimental and analytical backgrounds are discussed. The abilities of the resulted program have been studied by modeling some experimental specimens showing a reasonable agreement between the analytical and experimental findings

A new approach for nonlinear finite element analysis of reinforced concrete structures with corroded reinforcements

A new approach for nonlinear finite element analysis of corroded reinforcements in reinforced concrete (RC) structures is elaborated in the article. An algorithmic procedure for producing the tension-stiffening curve of RC elements taking into consideration most of effective parameters, e.g.: the rate of steel bar corrosion, bond-slip behavior, concrete cover and amount of reinforcement, is illustrated. This has been established on both experimental and analytical bases. This algorithm is implemented into a nonlinear finite element analysis program. The abilities of the resulted program have been studied by modeling some experimental specimens showing a reasonable agreement between the analytical and experimental findings

Investigation of Corrosion Effects on Bond-slip and Tensile Strength of Reinforced Concrete Members

The corrosion effect on tensile strength of RC members is very important to region with high corrosion conditions. In this article a study on finding bond behaviour, crack pattern, crack spacing, and tensile strength of RC members is presented. For this purpose a comprehensive experimental program including reinforced concrete cylanders with different concrete covers and reinforcement ratios under various corrosion rates is conducted. The specimens are located in large tub containing water and salt (5% salt solution) with a devich for accelerated corrosion production. For each specimen, the variation of total tensile strength versus its average strain is plotted and the member behaviour at various load levels is investigated. Average crack spacing, and maximum bond stress developed at each corrosion level are studied and their apporoperiate relationship are proposed. The main parameterrs considerd in this investigation are: corrosion rate (Cw), reinforcement diameter (d), reinforcement ratio (ρ), c/d and d/ρ

Corrosion effects on tension stiffening behavior of reinforced concrete

The investigation of corrosion effects on the tensile behavior of reinforced concrete (RC) members is very important in region prone to high corrosion conditions. In this article, an experimental study concerning corrosion effects on tensile behavior of RC members is presented. For this purpose, a comprehensive experimental program including 58 cylindrical reinforced concrete specimens under various levels of corrosion is conducted. Some of the specimens (44) are located in large tub containing water and salt (5% salt solution); an electrical supplier has been utilized for the accelerated corrosion program. Afterwards, the tensile behavior of the specimens was studied by means of the direct tension tests. For each specimen, the tension stiffening curve is plotted, and heir behavior at various load levels is investigated. Average crack spacing, loss of cross-section area due to corrosion, the concrete contribution to the tensile response for different strain levels, and maximum bond stress developed at each corrosion level are studied, and their appropriate relationships are proposed. The main parameters considered in this investigation are: degree concrete cover (c), ratio of of clear corrosion concrete (Cw), cover reinforcement to diameter (d), reinforcement ratio (ρ), rebar diameter (c/d), and ratio of rebar diameter clear to reinforcement percentage (d/ρ)

StEER 2022 Mw 6.1 Duzce, Turkey Earthquake Preliminary Virtual Reconnaissance Report (PVRR)

An earthquake occurred in Duzce, Turkey on Nov. 23, 2022 with magnitude of 6.1 and a depth of 10.0 km. The region has been struck by several destructive earthquakes in the past decades. The vast majority of the buildings in the region affected by the earthquake, including government and school buildings, have been either retrofitted or rebuilt after the Aug.17, 1999 Mw 7.6 Kocaeli and Nov. 12, 1999 Mw 7.2 Duzce earthquakes. No structural damage and nonstructural damage were reported in these buildings during this event. This low level of damage shows the effectiveness of retrofit measures and recent strict seismic design requirements enforced for the buildings constructed after 1999. In general, limited collapses and structural damage were observed. However, the economic losses due to nonstructural damage and business interruption were significant. There were no reports of damage to roads and bridges, and power, water, telecommunications, and other infrastructure and lifelines. This project encompasses the products of StEER’s response to this event: Preliminary Virtual Reconnaissance Report (PVRR)