Cyclic Response of Reinforced Concrete Members at Low Temperatures

Montejo, Luis A.; Sloan, John Elliot; Kowalsky, Mervyn J.; Hassan, Tasnim

doi:10.1061/(asce)0887-381x(2008)22:3(79)

Cited by 78 publications

(28 citation statements)

References 15 publications

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“…These damage models, illustrated in Figure 2, were calibrated for the expected damage and repair actions described previously, and their controlling parameters are presented in Table 1. Moment‐curvature analyses were performed using the software CUMBIA 46 with the axial load values characterized by the axial load ratios (ALR; ALR = P / f′ c Ag ) presented in Table 1. Force–displacement relationships for the piers were then computed considering a perfect cantilever behaviour.…”

Section: Application To a Single Bridgementioning

confidence: 99%

Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

Perdomo

Monteiro

2020

Earthq Engng Struct Dyn

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Simplified seismic assessment procedures relying on displacement‐based formulations have recently been implemented for the evaluation of the seismic performance in buildings and bridges. For bridges, displacement‐based assessment procedures have been formulated to predict the displacement response at several performance levels defined based on the expected damage on the structural elements. These displacement profiles have been subsequently used to estimate the performance level achieved under a given seismic hazard intensity and to develop damage fragility curves. For buildings, these concepts have been extended to compute economic losses in agreement with current performance‐based earthquake engineering procedures. In this study, existing displacement‐based formulations for the approximate seismic assessment of single‐column multi‐span continuous RC bridges, with non‐sacrificial shear keys for the pier‐to‐deck connections, are extended for the computation of expected annual losses under transverse direction excitation. Additionally, an iterative response spectrum analysis procedure, which directly considers higher mode effects, is proposed for computing the displacement response, and these results are also used to estimate direct expected annual losses. Results show that both procedures tend to compute higher losses when compared with those obtained with a fully probabilistic loss assessment framework, using demand estimations computed with nonlinear response history analysis. Results also show that the simplified loss assessment procedure is highly sensitive to the definition of the collapse fragility curve.

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Section: Application To a Single Bridgementioning

confidence: 99%

Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

Perdomo

Monteiro

2020

Earthq Engng Struct Dyn

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“…Several groups of test data from different literatures with various mix proportions are collected 47 for the comparison purpose, [11][12][13][48][49][50][51] as shown in Figure 10. 38 The w/c = 0.3 and w/c = 0.7 curves can be regarded as two bounds of usual concrete material.…”

Section: Strengthening Effect Under External Forcesmentioning

confidence: 99%

Two‐dimensional rigid body spring method based micro‐mesoscale study of mechanical strengthening/damaging effects to concrete by frost action

Gong

Ueda

Zhang

2018

Structural Concrete

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Frost damage is an important issue for service life evaluation of concrete structures in cold regions. In fact, the frost action can have both strengthening and damaging effects on the mechanical properties of concrete material, depending on several environmental and material factors, and this complexity makes the damage evaluation more difficult in the real environment. This paper aims to develop a unified model through a micro‐mesoscale approach, which can quantitatively estimate and distinguish the strengthening/damaging effects by frost action. At microscale, the model takes into account the prestressed condition by internal pore pressures, as well as the change of effective elastic properties when ice forms in micropores. At mesoscale, the mechanical contribution of ice and liquid inside mesocracks is considered. Finally, the static mechanical behaviors of concrete under different situations are simulated based on a two‐dimensional discrete model rigid body spring method. The simulated results can clearly distinguish and separate each strengthening and damaging effect. The microice may enlarge the strengths by 50–110% while the mesocracks may reduce the strength by 40–80%, the effect of ice in mesocracks is also discussed. The final apparent performance depends on which strengthening/damaging effect is more dominant and is mainly controlled by the entrained air amount. Previous experiments are also used to verify the proposed model, and they are found in a good agreement.

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“…As the corrosion of reinforcement directly affects concrete cover cracking, the study of the effects of cracked concrete cover on structural performance RC columns is important. To meet this aim, cross‐sectional analysis was performed using CUMBIA program . The effects of cracked cover on structural behavior can be quantified by developing moment‐curvature diagrams using the effective mechanical properties of sound and cracked cover.…”

Section: The Effects Of Corrosion‐induced Cracked Cover On the Structmentioning

confidence: 99%

Experimental evaluation of the residual compression strength and ultimate strain of chloride corrosion‐induced damaged concrete

Andisheh

Scott

Palermo

2018

Structural Concrete

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In this paper, the effects of chloride corrosion of steel reinforcement on the axial compressive strength and the ultimate strain of concrete materials in reinforced concrete columns have been investigated experimentally. In addition, the effects of reduction in the effective mechanical properties of concrete materials on momentcurvature response of a corroded bridge pier were numerically studied. This investigation has resulted in clear quantification of the relationship between the degree of reinforcement corrosion and the effective compression strength and ultimate strain of unconfined concrete. The results clearly show that corrosion of steel reinforcement resulted in a deterioration of the effective axial compression strength and ultimate strain of column's concrete cover.cracked concrete, reduction factor, reinforcement corrosion, residual capacity | INTRODUCTIONIn recent years, growing attention has been given to the effects of corrosion on the structural performance of reinforced concrete (RC) structures. Corrosion of reinforcing steel embedded in concrete is an electrochemical process commenced when aggressive ions such as chloride penetrate the concrete cover and reach the steel reinforcement. Once the corrosion process commences corrosion by-products such as rust are formed. Caré et al. 1 showed that the average volume of rust is more than two times greater than that of the steel resulting in the development of tensile stresses in concrete, which ultimately lead to cracking and spalling of the cover concrete. Cracking of the concrete due to corrosion causes a reduction in ductility capacity of RC columns. 2 Akiyama et al. 3 presented an analytical model to predict curvature at the onset of buckling of longitudinal reinforcement of corroded RC column considering cracked concrete cover due to corrosion. Tapan and Aboutaha 4 found that "cover to longitudinal bar diameter ratio has a critical effect on load carry capacity of deteriorated RC columns." They also found reinforcement corrosion and loss of concrete cover critically decrease load carry capacity of RC columns. Past studies showed cracking in the concrete cover plays important role in inelastic buckling behavior of longitudinal steel reinforcement of RC columns. [5][6][7] presented a relationship between external cracks width and bar section loss due to reinforcement corrosion.To model the effects of corrosion on the compression strength and the ultimate strain of the deteriorated concrete materials due to corrosion, some analytical methods were followed by researchers. The two analytical methods were presented as follows:Coronelli and Gambarova 9 used a model proposed by Vecchio and Collins 10 and improved by Capé 11 to predict reduction in the compressive strength of cover concrete due to reinforcement corrosion.In accordance with the modified model, the following equation was used to estimate the effect of cracks on the compressive strength of concrete 9

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Cyclic Response of Reinforced Concrete Members at Low Temperatures

Cited by 78 publications

References 15 publications

Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

Extension of displacement‐based simplified procedures to the seismic loss assessment of multi‐span RC bridges

Two‐dimensional rigid body spring method based micro‐mesoscale study of mechanical strengthening/damaging effects to concrete by frost action

Experimental evaluation of the residual compression strength and ultimate strain of chloride corrosion‐induced damaged concrete

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