12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 1Role of Uncertainty in Life-Cycle Design of Concrete Structures Fabio Biondini Department of Civil and Environmental Engineering, Politecnico di Milano, Milan, Italy Dan M. Frangopol Department of Civil and Environmental Engineering, Center for Advanced Technology for Large Structural Systems, Lehigh University, Bethlehem, PA, USA ABSTRACT: This paper investigates the time-variant uncertainty effects on the life-cycle safety, robustness and redundancy of deteriorating concrete structures. The investigated performance indicators are evaluated based on a general methodology for concrete structures subjected to diffusive attacks from external aggressive agents. The effects of the uncertainty associated with the random variables involved are quantified and compared by means of proper time-variant importance factors. The application to a reinforced concrete frame under different corrosion damage scenarios shows that the uncertainty effects vary over time with different trends for structural safety, robustness and redundancy. 1. INTRODUCTION In the classical approach to structural design, the level of performance and functionality is usually specified with reference to structural safety and serviceability and uncertainty is taken into account by means of semi-probabilistic approaches where only a few parameters are considered as random variables. For reinforced concrete structures, random variables are generally associated with material properties, such as concrete and steel strengths, and nominal values are assumed for other mechanical and geometrical parameters (CEN-EN 1992-1-1 2004). For undamaged concrete structures, this approach is calibrated by conservative codes and is proven to be effective for practical purposes. However, the effects of aging and deterioration processes due to aggressive chemical attacks and other physical damage mechanisms can lead over time to unsatisfactory structural performance (Ellingwood 2005). As a consequence, for deteriorating structures the required level of safety and serviceability should be ensured not only at the initial time, but over the expected service life (Frangopol and Ellingwood 2010, Frangopol 2011, Biondini and Frangopol 2014b). For this purpose, a proper calibration of life-cycle design procedures must consider the time variation of the uncertainty effects associated with the design parameters. In addition, a more comprehensive description of the lifetime structural performance is necessary when aging and deterioration are considered. This is achieved by means of time-variant structural performance indicators, such as robustness and redundancy (Frangopol and Curley 1987, Biondini and Restelli 2008, Biondini 2009, Ghosn et al. 2010, Okasha and Frangopol 2010, Decò et al. 2011, Saydam and Frangopol 2011, Frangopol and Zhu 2012, Biondini and Frangopol 2014a). The uncertainty effects on structural safety and serviceability of deteriorating concrete structures have been investigated elsewhere (Biondini et al. 2006b, 2008). In this paper, the investigation is extended to compare the time-variant uncertainty effects on the life-cycle structural performance in terms of safety, robustness and redundancy. These indicators are evaluated based on a general methodology for concrete structures subjected to diffusive attacks from external aggressive agents (Biondini et al. 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 22004, 2006a, Biondini and Frangopol 2008). The effects of the uncertainty associated with each random variable are quantified and compared by means of time-variant importance factors computed by regression analyses. The proposed approach is illustrated through the application to a reinforced concrete frame under different corrosion damage scenarios. The results show that the uncertainty effects and the relative importance of each random variable may vary over time with different trends for structural safety, robustness and redundancy. This further emphasizes the importance of a life-cycle design approach based on multiple performance indicators to take properly into account the time-variant uncertainty effects associated with deterioration processes. 2. DAMAGE MODELING In concrete structures damage is often induced by diffusion of aggressive agents, such as sulfates and chlorides, which may involve deterioration of concrete and corrosion of reinforcement (CEB 1992). 2.1. Local Damage The main effect of the corrosion process is a reduction of the reinforcing steel bar area. Such percentage can be effectively described by means of a dimensionless damage index s=s(t) which provides a direct measure of damage within the range [0,1]. The corrosion process causes also a reduction of steel ductility (Apostolopoulos and Papadakis 2008). Moreover, the formation of oxidation products may lead to propagation of longitudinal cracks and concrete cover spalling (Vidal et al. 2004). These effects can be modeled as a function of the damage index s as proposed in Biondini and Vergani (2014). However, this paper will focus on the effects of corrosion in terms of mass loss of the steel bars. To this aim, a deterioration process with no damage of concrete and uniform corrosion of steel bars is considered (Biondini and Frangopol 2013). The corrosion rate of steel depends on the concentration of the aggressive agent (Bertolini et al. 2004). Based on available information (Pastore and Pedeferri 1994), the damage index sm=s(xm,t) of the mth reinforcing steel bar located at point xm=(ym,zm) over a member cross-section is related at each time instant t to the diffusion process by assuming a linear relationship between the rate of damage and the mass concentration C=C(xm,t) of the aggressive agent (Biondini et al. 2004): ssmmstCtCtt ),(),( xx , t ≥ t0m (1) where Cs is the value of constant concentration which would lead to a complete damage of the steel bar over the time interval ts, t0m = mint C(xm,t) Ccr is the corrosion initiation time and Ccr is a critical threshold of concentration. The space and time distributions of concentration C=C(x,t) are affected by the diffusivity D of concrete (Glicksman 2000). An accurate numerical solution of the Fick’s differential equations, predicting (a) the diffusive flux to the concentration under the assumption of steady state and (b) how diffusion causes the concentration to change with time, can be achieved by means of cellular automata (Biondini et al. 2004, 2006a). 2.2. Global Damage The local damage index sm provides a time-variant measure of the corrosion damage of the mth steel bar. A global measure of steel damage s=s(t) may be derived from sm by a weighted average over the cross-section (Biondini 2009): smm smm smsmsms AtwAttwt )()()()( (2) where Asm is the area of the mth steel bar and wsm=wsm(t) is a suitable weight function. Same weights wsm(t)=w0 can be adopted if there are no bars playing a specific role in the damage process. It is worth noting that this cross-sectional formulation can be extended at the structural level by integration over all members of the system. 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 33. PERFORMANCE INDICATORS 3.1. Failure Loads For concrete frame structures, limit states of interest are the occurrence of the first local failure of a critical cross-section, that represents a warning for initiation of damage propagation, and the global collapse of the structural system. Denoting 0 a scalar multiplier of the live loads, these limit states can be identified by the limit load multipliers 1 and c associated to reaching of first local failure and structural collapse, respectively. Since structural performance deteriorates over time, the functions 1=1(t) and c=c(t) need to be evaluated by time-variant structural analyses taking into account the effects of damage (Biondini et al. 2004, 2006a). By assuming that shear failures are avoided by a proper capacity design, the limit load multipliers 1 and c can be computed under the hypotheses of linear elastic behavior up to first local failure, and perfect plasticity at structural collapse, respectively (Biondini and Frangopol 2008). 3.2. Safety Factor The main objective of structural design is to ensure an adequate level of safety against the limit state of collapse. A structure is safe if the design load multiplier =(t) is no larger than the collapse value c=c(t). The safety criterion can be expressed as follows: 1)()(),( ** ttcc (3) where Θ(, c) is a safety factor. 3.3. Robustness Factor Structural robustness measures the ability of the system to suffer an amount of damage not disproportionate with respect to the causes of the damage itself (Ellingwood 2006). A robustness measure is obtained by comparing the system performance in the original state, in which the structure is fully intact, and in a perturbed state, in which a damage scenario is applied (Frangopol and Curley 1987, Biondini and Restelli 2008). The ratio of the collapse load multiplier c=c(t) to its initial value c0=c(0) is assumed as time-variant performance index within the range [0;1]: 0)()(cc tt (4) The performance index (t) is hence compared with the global damage index ss(t) representing the amount of steel corrosion over the structure within the range [0;1]. The following robustness criterion has been proposed in Biondini (2009): 1)()(),( ttR (5) where R=R(, ) is a robustness factor, and is a shape parameter of the boundary R=R(, )=1. A value =1 indicates a proportionality between loss of performance and damage. The structural system is robust when R1, and not robust otherwise (R<1). 3.4. Redundancy Factor Structural redundancy denotes the ability of the system to redistribute among its members the load which can no longer be sustained by some other damaged members after the occurrence of a local failure (Frangopol and Curley 1987). The load redistribution after the first local failure up to collapse depends on the difference between the limit load multipliers c=c(t) and 1=1(t). The following quantity is assumed as time-variant measure of redundancy in the range [0;1] (Biondini and Frangopol 2014a): )()()(),( 11 tttccc (6) The redundancy factor =(t) is zero when there is no reserve of load capacity after the first failure (1=c), and tends to unity when the first failure load capacity is negligible with respect to the collapse load capacity (1<<c). 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 44. ROLE OF UNCERTAINTY 4.1. Probabilistic Model The probabilistic model is formulated at cross-sectional level by assuming as random variables the strength of both concrete fc and steel fsy, the coordinates (yp, zp) of each nodal point p of the member cross-section, the coordinates (ym, zm) and diameter m of each steel bar m, the diffusivity coefficient D, and the steel damage rate qs=(Csts)1. Nominal values are considered as mean values. The random variables are assumed uncorrelated with the probabilistic distributions and standard deviation values listed in Table 1 (Biondini and Frangopol 2013). Table 1. Probabilistic model (nom = nominal value). Random Variable (t = 0) Distribution St. Dev.Concrete strength, fc Lognormal 5 MPa Steel strength, fsy Lognormal 30 MPa Coordinates of nodes, (yp, zp) Normal 5 mm Coordinates of bars, (ym, zm) Normal 5 mm Diameter of bars, m Normal (*) 0.10m,nom Diffusivity, D Normal (*) 0.10 Dnom Steel damage rate, qs=(Csts)1 Normal (*) 0.30 qs,nom (*) Truncated distributions with non negative outcomes. 4.2. Importance Factor Let X denote a parameter of the problem, and Y a performance indicator. In order to investigate the time-variant effects of the uncertainty associated with each explanatory variable X=X(t) on each response variable Y=Y(t), the following standard variates are introduced (Biondini et al. 2008): )()()()( tttXtXX (7) )()()()( tttYtYY (8) where μX, X, and μY, Y, are the time-variant mean value and standard deviation of the random variables X and Y, respectively. Based on a data sample of X and Y=Y(X), a set of time-variant least squares linear regression can be performed: )()()()( ,0 tttt XYXY (9) The regression coefficient XYXY(t) provide a time-dependent measure of the sensitivity of the response variable Y with respect to the explanatory variable X. This measure is weighted by means of the correlation coefficient XYXY(t) to account for the degree of linearity of the model Y=Y(X): )()()( tttI XYXYXY (10) where IXYIXY(t) is an importance factor of the time-variant uncertainty effects related to X and Y. 5. APPLICATION 5.1. Case study The shear-type reinforced concrete frame shown in Figure 1 is considered (Biondini and Frangopol 2013, 2014a). The frame is subjected to a dead load q=32 kN/m applied on the beam and an horizontal load F acting at top of the columns, with *=1 and F=100 kN. The material strengths are fc40 MPa for concrete and fsy500 MPa for steel. Two exposure scenarios are studied, with columns exposed (I) on the outermost side only and (II) on the four sides, with concentration C0. (I) (II) Figure 1. Reinforced concrete frame. Geometry, structural scheme, loading condition and exposure scenarios: (I) columns with exposure on one side; (II) columns with exposure on four sides. Fq 816300450 mm5.0 m 12.5 m 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 55.2. Performance Indicators The lifetime structural performance of the frame is investigated in terms of safety, robustness and redundancy by assuming a diffusivity coefficient D 1011 m2/sec and a severe corrosion process with Cs=C0, ts=50 years and Ccr=0. Figure 2 shows the evolution over a 50-year lifetime of the probabilistic parameters of the safety factor , robustness factor R and redundancy factor computed by Monte Carlo simulation for the two investigated exposure scenarios. The results show that, as expected, safety deteriorates over time. Moreover, case (II) with full exposure is the worst damage scenario in terms of safety. Despite this trend, the frame is robust over the lifetime and case (I) with localized corrosion is the worst damage scenario in terms of robustness. For redundancy, a significant increase is obtained over time for case (I). However, the beneficial effects of damage are reduced for case (II), which is the worst damage scenario also in terms of redundancy. In all cases, the uncertainty effects increase over time with damage. It is also interesting to note that the probability density functions (PDFs) of safety and robustness remain centered over the lifetime around mean values that are close to the nominal values. On the contrary, for redundancy the PDFs are characterized over the lifetime by mean values sensibly higher than the nominal values. This is due to the effects of randomness that, for the cases studied, emphasize the reserve of load capacity after the first local failure and lead, in this way, to an increase on average of the lifetime redundancy. Therefore, safety, robustness and redundancy over time may exhibit opposite trends depending on the structural system and exposure scenario. 5.3. Uncertainty Effects The role of the uncertainty effects on the life-cycle performance of the frame system is also investigated. Figure 3 shows the time evolution of the importance factors of the random variables which mainly affect safety, robustness and redundancy for the two investigated exposure scenarios. For the sake of synthesis, the importance factors associated with the area As of the steel bars are computed with reference to the mean values of the corresponding standard variates over the whole cross-section. The safety factor of the undamaged frame mainly depends on the steel strength fsy and steel bar areas As. Such dependency quickly decreases over time, and the steel damage rate qs becomes the more important parameter after about 40 years for case (I) and 10 years for case (II). However, the importance of this parameter tends to decrease when a severe cumulated damage occurs, as it happens for case (II) after about 35 years. A similar dependency on the steel damage rate qs is found for the robustness factor R, which is mainly related to this variable only. Finally, the redundancy factor of the undamaged frame mainly depends on the steel bar areas As. As for the case of safety, this dependency is reduced with damage and over time the importance of the steel damage rate qs quickly increases. However, an opposite trend is observed for the two exposure scenarios, since the primary role of qs is reached earlier for case (I) than for case (II), respectively after about 15 years and 25 years. Again, the importance of this parameter decreases under the severe cumulated damage occurring in case (II). 6. CONCLUSIONS The lifetime safety, robustness and redundancy of concrete structures in aggressive environment have been investigated. The results of this study showed that the importance of the uncertainty effects associated with the design parameters may significantly vary over time, with different trends depending on the performance indicators. Therefore, the classical approach in which the main role in concrete design is played by the uncertainty associated with the material strengths needs to be reconsidered to account for the time-variant uncertainty effects associated to damage. Despite the necessity to extend the investigation by including the effects of time-variant loadings and to improve the regression models, it has been shown that the proposed importance factors can be used effectively to capture the time-variant role played by the uncertainty effects. 12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 6 (a) (b) Figure 2. Time evolution of the probabilistic parameters of safety factor , robustness factor R and redundancy factor for (a) scenario (I) with exposure on one side, and (b) scenario (II) with exposure on four sides. The shaded region is bounded by the mean plus/minus one standard deviation. 0,400,600,801,001,201,401,601,800 10 20 30 40 50Safety Factor Time t [years]0,400,600,801,001,201,401,601,800 10 20 30 40 50Safety Factor Time t [years]0,951,001,051,101,151,201,251,300 10 20 30 40 50Robustness Factor RTime t [years]0,951,001,051,101,151,201,251,300 10 20 30 40 50Robustness Factor RTime t [years]0,100,150,200,250,300,350,400,450 10 20 30 40 50Redundancy Factor Time t [years]0,100,150,200,250,300,350,400,450 10 20 30 40 50Redundancy Factor Time t [years]12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 7 (a) (b) Figure 3. Time evolution of the importance factor of the random variables affecting safety, robustness and redundancy for (a) scenario (I) with exposure on one side, and (b) scenario (II) with exposure on four sides. 0.000.100.200.300.400.500.600 10 20 30 40 50Importance Factor I Time t [years]fyAsqs0.000.100.200.300.400.500.600 10 20 30 40 50Importance Factor I Time t [years]fyAsqs0.000.120.240.360.480.600.720 10 20 30 40 50Importance Factor I RTime t [years]qs0.000.120.240.360.480.600.720 10 20 30 40 50Importance Factor I RTime t [years]qs0.000.060.120.180.240.300.360 10 20 30 40 50Importance Factor I Time t [years]Asqs0.000.060.120.180.240.300.360 10 20 30 40 50Importance Factor I Time t [years]Asqs12th International Conference on Applications of Statistics and Probability in Civil Engineering, ICASP12 Vancouver, Canada, July 12-15, 2015 87. REFERENCES Apostolopoulos, C.A., and Papadakis, V.G. (2008). Consequences of steel corrosion on the ductility properties of reinforcement bar. Construction and Building Materials, 22(12), 2316-2324. Bertolini, L., Elsener, B., Pedeferri, P., and Polder, R. (2004). Corrosion of steel in concrete. Wiley-VCH, Weinheim, Germany. Biondini, F. (2009). A measure of lifetime structural robustness. SEI/ASCE Structures Congress, Austin, TX, USA, April 30-May 2. In: Structures Congress 2009, L. Griffis, T. Helwig, M. Waggoner, and M. Hoit (Eds.), ASCE, CD-ROM. Biondini, F., Bontempi, F., Frangopol, D.M., and Malerba, P.G. (2004). Cellular automata approach to durability analysis of concrete structures in aggressive environments, Journal of Structural Engineering, ASCE, 130(11), 1724-1737. Biondini, F., Bontempi, F., Frangopol, D.M., and Malerba, P.G. (2006a). Probabilistic service life assessment and maintenance planning of concrete structures, Journal of Structural Engineering, ASCE, 132(5), 810-825. Biondini, F., Bontempi, F., Frangopol, D.M., and Malerba P.G. (2006b). Lifetime nonlinear analysis of concrete structures under uncertainty. Third International Conference on Bridge Maintenance, Safety and Management (IABMAS’06), Porto, Portugal, July 16-19, 2006. In: Bridge Maintenance, Safety, Management, Life-cycle Performance and Cost, P.J.S. Cruz, D.M. Frangopol, L.C. Neves (Eds.), CRC Press/Balkema, Taylor & Francis Group, London, UK. Biondini, F., and Frangopol, D.M. (2008). Probabilistic limit analysis and lifetime prediction of concrete structures, Structure and Infrastructure Engineering, 4(5), 399-412. Biondini, F., and Frangopol, D.M. (2013). Time effects on robustness and redundancy of deteriorating concrete structures. 11th International Conference on Structural, Safety & Reliability (ICOSSAR 2013), New York, NY, USA, June 16-20, 2013. In: Safety, Reliability, Risk and Life-Cycle Performance of Structures and Infrastructures, G. Deodatis, B.R. Ellingwood, D.M. Frangopol (Eds.), CRC Press/Balkema, Taylor & Francis Group, London, UK. 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International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP) (12th : 2015)
Role of uncertainty in life-cycle design of concrete structures Biondini, Fabio; Frangopol, Dan M. Jul 31, 2015
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Title | Role of uncertainty in life-cycle design of concrete structures |
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Biondini, Fabio Frangopol, Dan M. |
Contributor | International Conference on Applications of Statistics and Probability (12th : 2015 : Vancouver, B.C.) |
Date Issued | 2015-07 |
Description | This paper investigates the time-variant uncertainty effects on the life-cycle safety, robustness and redundancy of deteriorating concrete structures. The investigated performance indicators are evaluated based on a general methodology for concrete structures subjected to diffusive attacks from external aggressive agents. The effects of the uncertainty associated with the random variables involved are quantified and compared by means of proper time-variant importance factors. The application to a reinforced concrete frame under different corrosion damage scenarios shows that the uncertainty effects vary over time with different trends for structural safety, robustness and redundancy. |
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Language | eng |
Notes | This collection contains the proceedings of ICASP12, the 12th International Conference on Applications of Statistics and Probability in Civil Engineering held in Vancouver, Canada on July 12-15, 2015. Abstracts were peer-reviewed and authors of accepted abstracts were invited to submit full papers. Also full papers were peer reviewed. The editor for this collection is Professor Terje Haukaas, Department of Civil Engineering, UBC Vancouver. |
Date Available | 2015-05-12 |
Provider | Vancouver : University of British Columbia Library |
Rights | Attribution-NonCommercial-NoDerivs 2.5 Canada |
DOI | 10.14288/1.0076026 |
URI | http://hdl.handle.net/2429/53111 |
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Citation | Haukaas, T. (Ed.) (2015). Proceedings of the 12th International Conference on Applications of Statistics and Probability in Civil Engineering (ICASP12), Vancouver, Canada, July 12-15. |
Peer Review Status | Unreviewed |
Scholarly Level | Faculty |
Rights URI | http://creativecommons.org/licenses/by-nc-nd/2.5/ca/ |
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