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Tahershamsi, M., Fernandez, I., Zandi, K. & Lundgren, K. (2017). Four levels to assess anchorage capacity of corroded reinforcement in concrete. Engineering structures, 147, 434-447
Open this publication in new window or tab >>Four levels to assess anchorage capacity of corroded reinforcement in concrete
2017 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 147, p. 434-447Article in journal (Refereed) Published
Abstract [en]

Corrosion of reinforcement affects anchorage capacity. In this study, four levels of analyses were, for the first time, compared with each other and to tests of naturally corroded beams. In the most advanced approach, three-dimensional non-linear finite element (3D NLFE) analyses employing previously developed bond and corrosion models were carried out. These analyses agreed well with the experiments in terms of crack pattern and maximum load capacity. The next approach consisted of 3D NLFE analyses with a pre-defined bond-slip relation between concrete and reinforcement, resulting in reasonable agreement; however, the anchorage capacity was overestimated and the crack pattern deviated from the experiments. At the next level, the bond-slip relation was used together with a measured available anchorage length, and the anchorage capacity was obtained by numerically solving the one-dimensional differential equation; the results were reasonably close to the experiments. In the most simplified approach, a constant bond stress was assumed together with the available anchorage length measured, which underestimated the capacities. In conclusion, the more advanced analyses provide reliable information regarding the structural behaviour, while the two simplified methods are well suited for use in practice.

Keywords
Anchorage, Assessment, Bond, FE analysis, Modelling, Natural corrosion, Reinforced concrete, Anchorages (concrete construction), Anchorages (foundations), Bond strength (materials), Bonding, Concretes, Corrosion, Cracks, Differential equations, Finite element method, Models, Corroded reinforcement, Corrosion of reinforcement, Levels of analysis, Maximum load capacity, Non-linear finite elements, Structural behaviour, Concrete reinforcements
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-30802 (URN)10.1016/j.engstruct.2017.06.024 (DOI)2-s2.0-85020549063 (Scopus ID)
Note

Funding details: Chalmers Tekniska Högskola; Funding text: This work was undertaken at Chalmers University of Technology, Division of Structural Engineering, Concrete Structures. The authors would like to acknowledge the funding from the Swedish Transport Administration (Trafikverket).

Available from: 2017-09-06 Created: 2017-09-06 Last updated: 2019-07-02Bibliographically approved
Plos, M., Shu, J., Lundgren, K. & Zandi, K. (2016). A multi-level structural assessment strategy for analysis of RC bridge deck slabs. In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden (pp. 1559-1566). IABSE c/o ETH Hönggerberg
Open this publication in new window or tab >>A multi-level structural assessment strategy for analysis of RC bridge deck slabs
2016 (English)In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, p. 1559-1566Conference paper, Published paper (Refereed)
Abstract [en]

A multi-level structural assessment strategy for evaluation of response and load carrying capacity of reinforced concrete bridges deck slabs are presented [1]. The strategy is based on the principle of successively improved analysis methods in structural assessment. It provides a structured approach to the use of simplified as well as advanced non-linear finite element analysis methods. The proposed methods were used for analysis of previously tested slabs subjected to bending and shear type of failures. As expected, the advanced methods gave an improved understanding of the structural response and were capable of demonstrating higher, yet conservative, predictions of the load-carrying capacity. The proposed strategy clearly provides the engineering community a framework for using successively improved structural analysis methods for enhanced assessment in a straightforward manner.

Place, publisher, year, edition, pages
IABSE c/o ETH Hönggerberg, 2016
Keywords
Multi-level assessment, reinforced concrete slabs, non-linear finite-element analysis, load-carrying capacity, bending failure, shear-type failure
National Category
Civil Engineering Infrastructure Engineering Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-27811 (URN)2-s2.0-85018949346 (Scopus ID)9783857481444 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-08-08Bibliographically approved
Blomfors, M., Zandi, K., Lundgren, K., Larsson, O. & Honfi, D. (2016). Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete. In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden (pp. 2109-2116). IABSE c/o ETH Hönggerberg
Open this publication in new window or tab >>Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete
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2016 (English)In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, p. 2109-2116Conference paper, Published paper (Refereed)
Abstract [en]

There is an increasing need for reliable methods to assess load-carrying capacity and remaining service life of existing infrastructure. Several previous research projects have resulted in a verified, simple 1D model for assessment of anchorage in corroded reinforced concrete structures. Previous verification has involved both experiments and detailed 3D NLFE analyses. To further develop the 1D model it needs to be extended to comprise more practical situations. In order to facilitate an efficient extension procedure in the future, the size of 3D NLFE model that is required to capture the bond behaviour between corroded reinforcement and concrete is investigated. Beam-end models and models of sub-sections were studied, and the results in terms of bond stress and crack pattern were compared. Preliminary results indicate good agreement for some situations; however for some cases a section model seems to overestimate the capacity.

Place, publisher, year, edition, pages
IABSE c/o ETH Hönggerberg, 2016
Keywords
corrosion, bond, concrete, reinforcement, nonlinear FEA
National Category
Civil Engineering Infrastructure Engineering Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-27813 (URN)2-s2.0-85018960322 (Scopus ID)978-3-85748-144-4 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-08-13Bibliographically approved
Williams Portal, N., Zandi, K., Malaga, K. & Wlasak, L. (2016). GFRP connectors in textile reinforced concrete sandwich elements. In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden (pp. 1336-1343). IABSE c/o ETH Hönggerberg
Open this publication in new window or tab >>GFRP connectors in textile reinforced concrete sandwich elements
2016 (English)In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, p. 1336-1343Conference paper, Published paper (Refereed)
Abstract [en]

In this paper, both experimental and numerical methods are presented to gain an understanding of the structural behaviour related to a TRC sandwich panel with a glass fibre reinforced polymer (GFRP) plate connection system. Double shear tests were conducted on component-scale sandwich panels to characterize the available shear capacity provided by the connectors and panel configuration. Three-dimension (3D) non-linear Finite Element Analysis (NLFEA) was applied to develop a model for the design of TRC sandwich panels while focusing on the connectors. The experimental outcome of the shear tests was applied to validate the corresponding numerical model developed in this work. The need for further modifications to the design of the shear connectors or other parameters such as panel thickness can be established accordingly. This developed FE model can essentially be applied as a design tool to further predict the structural behaviour of the full-scale sandwich elements.

Place, publisher, year, edition, pages
IABSE c/o ETH Hönggerberg, 2016
Keywords
sandwich elements, textile reinforced concrete (TRC), glass fibre reinforced polymer (GFRP), shear connectors, experiments, finite element analysis (FEA)
National Category
Civil Engineering Applied Mechanics Composite Science and Engineering
Identifiers
urn:nbn:se:ri:diva-27810 (URN)2-s2.0-85018962869 (Scopus ID)978-3-85748-144-4 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-08-12Bibliographically approved
Shu, J., Plos, M., Zandi, K. & Johansson, M. (2016). Numerical prediction of punching behavior of RC slabs using 3D non-linear FE analysis. In: Maintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks - Proceedings of the 8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016: . Paper presented at 8th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2016), June 26-30, 2016, Foz do Iguaçu, Brazil (pp. 1607-1611).
Open this publication in new window or tab >>Numerical prediction of punching behavior of RC slabs using 3D non-linear FE analysis
2016 (English)In: Maintenance, Monitoring, Safety, Risk and Resilience of Bridges and Bridge Networks - Proceedings of the 8th International Conference on Bridge Maintenance, Safety and Management, IABMAS 2016, 2016, p. 1607-1611Conference paper, Published paper (Refereed)
Abstract [en]

This study was conducted by carrying out nonlinear FE analysis of RC slabs subjected to punching failure, using three-dimensional (3D) continuum elements. The influence of several modelling choices for concrete material were investigated by comparing results such as load-carrying capacity, load-deflection response and crack pattern from the FE analyses with available experimental data. The analyses of the tested slabs show possibility to accurately predict the load-carrying capacity and realistically simulate the behavior of slabs using the proposed method.

National Category
Applied Mechanics Infrastructure Engineering Civil Engineering
Identifiers
urn:nbn:se:ri:diva-27785 (URN)2-s2.0-85001075220 (Scopus ID)9781138028517 (ISBN)
Conference
8th International Conference on Bridge Maintenance, Safety and Management (IABMAS 2016), June 26-30, 2016, Foz do Iguaçu, Brazil
Note

Conference Paper

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2019-06-25Bibliographically approved
Shu, J., Plos, M., Zandi, K., Johansson, M. & Nilenius, F. (2016). Prediction of punching behaviour of RC slabs using continuum non-linear FE analysis. Engineering structures, 125, 15-25
Open this publication in new window or tab >>Prediction of punching behaviour of RC slabs using continuum non-linear FE analysis
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2016 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 125, p. 15-25Article in journal (Refereed) Published
Abstract [en]

Failure of reinforced concrete (RC) slabs without shear reinforcement in punching has been a challenging problem for nonlinear finite element (FE) analysis. To improve the analysis approach, this study was conducted by developing a nonlinear FE analysis method for slabs subjected to punching failure without shear reinforcement, using three-dimensional continuum elements. The influence of several modelling choices were investigated by comparing such results as loadcarrying capacity, load-deflection response and crack pattern from the FE analyses with available experimental data. The proposed method shows the possibility of accurately predicting the load-carrying capacity and realistically describing the behaviour of slabs.

Place, publisher, year, edition, pages
Elsevier, 2016
Keywords
finite element analysis, punching failure, RC slabs, structural behaviour
National Category
Building Technologies Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-797 (URN)10.1016/j.engstruct.2016.06.044 (DOI)2-s2.0-84978194048 (Scopus ID)
Available from: 2016-08-07 Created: 2016-08-07 Last updated: 2019-06-17Bibliographically approved
Shu, J., Plos, M., Nilenius, F., Zandi, K. & Johansson, M. (2016). Prediction of punching behaviour of RC slabs using continuum nonlinear FE analysis. In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment. Paper presented at 19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden (pp. 1629-1636). IABSE c/o ETH Hönggerberg
Open this publication in new window or tab >>Prediction of punching behaviour of RC slabs using continuum nonlinear FE analysis
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2016 (English)In: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, p. 1629-1636Conference paper, Published paper (Refereed)
Abstract [en]

Failure of reinforced concrete (RC) slabs in punching has been a challenging problem for nonlinear finite element (FE) analysis. To improve the analysis approach, this study was conducted by developing a nonlinear FE analysis method for slabs subjected to punching failure, using three-dimensional continuum elements. The influence of several modelling choices were investigated by comparing such results as load carrying capacity, load-deflection response and crack pattern from the FE analyses with available experimental data. The proposed method show the possibility of accurately predicting the load-carrying capacity and realistically describing the behaviour of slabs.

Place, publisher, year, edition, pages
IABSE c/o ETH Hönggerberg, 2016
Keywords
RC slabs, punching failure, finite element analysis, structural behaviour
National Category
Civil Engineering Infrastructure Engineering Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-27812 (URN)2-s2.0-85018939279 (Scopus ID)978-3-85748-144-4 (ISBN)
Conference
19th IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, September 21-23, 2016, Stockholm, Sweden
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2019-08-13Bibliographically approved
Zandi, K. (2015). Corrosion-induced cover spalling and anchorage capacity (ed.). Structure and Infrastructure Engineering, 11(12), 1547-1564
Open this publication in new window or tab >>Corrosion-induced cover spalling and anchorage capacity
2015 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 11, no 12, p. 1547-1564Article in journal (Refereed) Published
Abstract [en]

The aim of this study is to enhance our understanding of anchorage capacity in reinforced concrete structures with corrosion-induced cover spalling. Our objectives were to study the influence of corrosion-induced cover spalling on bond strength, and to validate an existing one-dimensional (1D) analysis for anchorage capacity in such cases. Thus, earlier developed bond and corrosion models suited for detailed three-dimensional (3D) finite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 1D and 3D FE analyses were validated through two types of experiments, i.e. eccentric pull-out tests and beam tests, as well as a comparison with an existing empirical model. The application of 3D FE analysis showed that the corrosion of stirrups advances the emergence of cracking and spalling, while bond strength is only slightly influenced by the corrosion of stirrups after cover spalling if yielding of stirrups has not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance from the main bar, and that the corrosion of stirrups influenced the shear capacity more prominently than the induced stresses in stirrups due to the corrosion of main bars.

Keywords
anchorages, bearing capacity, concrete structures, corrosion, reinforcement, three-dimensional models
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:ri:diva-2689 (URN)10.1080/15732479.2014.979836 (DOI)4704 (Local ID)4704 (Archive number)4704 (OAI)
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2019-07-02Bibliographically approved
Shu, J., Fall, D., Plos, M., Zandi, K. & Lundgren, K. (2015). Development of modelling strategies for two-way RC slabs. Engineering structures, 101, 439-449
Open this publication in new window or tab >>Development of modelling strategies for two-way RC slabs
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2015 (English)In: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 101, p. 439-449Article in journal (Refereed) Published
Abstract [en]

Analyses of tested two-way reinforced concrete (RC) slabs were carried out with varying modelling choices to develop better modelling strategies. The aim was to study how accurately the response of a slab subjected to bending could be predicted with nonlinear finite element (FE) analysis using three-dimensional (3D) continuum elements, and how the modelling choices might influence the analysis results. The load-carrying capacity, load-deflection response, crack pattern and reaction-force distribution of the two-way slab studied were compared to experimental data available. The influence of several modelling parameters was investigated, including geometric nonlinearity, element properties, concrete model, reinforcement model and boundary condition. The results show the possibility of accurately reflecting the experimental results concerning load-carrying capacity, load-deflection response and crack pattern giving proper modelling choices. Moreover, the reaction force distribution was found to be highly influenced by the stiffness of the supports.

Place, publisher, year, edition, pages
Elsevier, 2015
Keywords
capacity, crack, FE analysis, load distribution, modelling choices, two-way RC slab
National Category
Civil Engineering
Identifiers
urn:nbn:se:ri:diva-343 (URN)10.1016/j.engstruct.2015.07.003 (DOI)2-s2.0-84938723669 (Scopus ID)
Note

Old ID: 5315

Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2019-07-03Bibliographically approved
Miccoli, L., Fontana, P., Johansson, G., Zandi, K., Williams Portal, N. & Mueller, U. (2015). Numerical modelling of UHPC and TRC sandwich elements for building envelopes. In: IABSE Conference 2015: Structural Engineering: Providing Solutions to Global Challenges. Paper presented at IABSE Conference 2015: Structural Engineering: Providing Solutions to Global Challenges, September 23-25, 2015, Geneva, Switzerland (pp. 195-203). IABSE
Open this publication in new window or tab >>Numerical modelling of UHPC and TRC sandwich elements for building envelopes
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2015 (English)In: IABSE Conference 2015: Structural Engineering: Providing Solutions to Global Challenges, IABSE , 2015, p. 195-203Conference paper, Published paper (Refereed)
Abstract [en]

In this paper a modelling approach is presented to reproduce the mechanical behaviour of sandwich panels via finite element analysis. Two types of panels were investigated in this scope of work. The first sandwich element was a textile reinforced concrete (TRC) panel with cellular lightweight concrete insulation and the second configuration was an ultra-high performances concrete (UHPC) panel with aerated autoclaved concrete insulation. The goal was to obtain a reliable numerical strategy that represents a reasonable compromise in terms of sufficient accuracy of the element characteristics and the computational costs. The results show the possibility of describing the composite action in a full sandwich panel. The achieved modelling approach will later be used for the optimization of TRC and UHPC panels in terms of minimizing the thickness, identifying the number and location of connectors, as well as evaluating varying anchorage systems.

Place, publisher, year, edition, pages
IABSE, 2015
Keywords
autoclaved aerated concrete (AAC), cellular lightweight concrete (CLC), finite element analysis (FEA), sandwich elements, textile reinforced concrete (TRC), ultra-high performance concrete (UHPC)
National Category
Civil Engineering
Identifiers
urn:nbn:se:ri:diva-177 (URN)10.2749/222137815818357089 (DOI)2-s2.0-84971222053 (Scopus ID)9781510820029 (ISBN)
Conference
IABSE Conference 2015: Structural Engineering: Providing Solutions to Global Challenges, September 23-25, 2015, Geneva, Switzerland
Available from: 2016-06-18 Created: 2016-06-10 Last updated: 2019-07-11Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4565-5345

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