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Plos, M., Shu, J., Zandi, K. & Lundgren, K. (2017). A multi-level structural assessment strategy for reinforced concrete bridge deck slabs. Structure and Infrastructure Engineering, 13(2), 223-241
Open this publication in new window or tab >>A multi-level structural assessment strategy for reinforced concrete bridge deck slabs
2017 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 13, no 2, p. 223-241Article in journal (Refereed) Published
Abstract [en]

This paper proposes a multi-level assessment strategy for reinforced concrete bridge deck slabs. The strategy is based on the principle of successively improved evaluation in structural assessment. It provides a structured approach to the use of simplified as well as advanced non-linear analysis methods. Such advanced methods have proven to possess great possibilities of achieving better understanding of the structural response and of revealing higher load-carrying capacity of existing structures. The proposed methods were used for the analysis of previously tested two-way slabs subjected to bending failure and a cantilever slab subjected to a shear type of failure, in both cases loaded with concentrated loads. As expected, the results show that more advanced methods yield an improved understanding of the structural response and are capable of demonstrating higher, yet conservative, predictions of the load-carrying capacity. Nevertheless, 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
Taylor & Francis, 2017
Keywords
bending failure, load-carrying capacity, multi-level assessment, non-linear finite-element analysis, reinforced concrete slabs, shear-type failure
National Category
Building Technologies Infrastructure Engineering
Identifiers
urn:nbn:se:ri:diva-384 (URN)10.1080/15732479.2016.1162177 (DOI)2-s2.0-84963575895 (Scopus ID)
Available from: 2016-06-20 Created: 2016-06-20 Last updated: 2020-04-28Bibliographically approved
Williams Portal, N., Flansbjer, M., Zandi, K., Wlasak, L. & Malaga, K. (2017). Bending behaviour of novel Textile Reinforced Concrete-foamed concrete (TRC-FC) sandwich elements. Composite structures, 177, 104-118
Open this publication in new window or tab >>Bending behaviour of novel Textile Reinforced Concrete-foamed concrete (TRC-FC) sandwich elements
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2017 (English)In: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 177, p. 104-118Article in journal (Refereed) Published
Abstract [en]

A novel sandwich element design consisting of two facings made of carbon reinforced Textile Reinforced Concrete (TRC), a low density foamed concrete (FC) core and glass fibre reinforced polymer (GFRP) connecting devices was experimentally investigated according to quasi-static and cyclic quasi-static fourpoint bending. Optical measurements based on Digital Image Correlation (DIC) were taken during testing to enable a detailed analysis of the bending behaviour and level of composite action. A model, verified by the experiments, was developed based on non-linear finite element analysis (NLFEA) to gain further insight on the failure mechanisms. Under both loading conditions, the bending behaviour of the TRCFC composite elements was characterized by favourable load bearing capacity, partial composite action, superior ductility and multiple fine cracking. The connecting devices were found to be the critical elements causing the initial failure mechanism in the form of localized pull-out within an element.

National Category
Building Technologies
Identifiers
urn:nbn:se:ri:diva-30029 (URN)10.1016/j.compstruct.2017.06.051 (DOI)2-s2.0-85021406539 (Scopus ID)
Projects
H-House
Funder
EU, European Research Council, 608893
Available from: 2017-06-30 Created: 2017-06-30 Last updated: 2020-04-28Bibliographically approved
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
Tahershamsi, M., Fernandez, I., Lundgren, K. & Zandi, K. (2017). Investigating correlations between crack width, corrosion level and anchorage capacity. Structure and Infrastructure Engineering, 13(10), 1294-1307
Open this publication in new window or tab >>Investigating correlations between crack width, corrosion level and anchorage capacity
2017 (English)In: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 13, no 10, p. 1294-1307Article in journal (Refereed) Published
Abstract [en]

In assessing existing structures, inspection results need to be linked to the effects on load-carrying capacity; to provide such information, this study has investigated the correlation between splitting crack width, corrosion level and anchorage capacity. The study was based on 13 reinforced concrete beams that had been exposed to natural corrosion for 32 years, 11 beams with splitting cracks and 2 without. The crack pattern and widths were documented before undergoing structural testing of anchorage capacity. Thereafter, the reinforcement bars were extracted and their corrosion levels measured using two methods, gravimetric weight loss and 3D scanning. The corrosion level from the weight loss method was approximately twice as large; possible reasons are horizontal or subsurface corrosion pits, and the cleaning method. Further, for the same corrosion level, the specimens in this study had much larger crack widths and slightly lower bond capacity than the artificially corroded tests in the literature; a possible reason is that these specimens had been subjected to combined corrosion and freezing. However, the corrosion level and reduction in bond capacity related to crack width were both lower in the present than in previous studies in the literature. Thus, by formulating a damage indicator from the damage visible in the form of crack widths from artificial test data, the structural capacity is estimated to be on the safe side.

Place, publisher, year, edition, pages
Taylor & Francis, 2017
Keywords
3D optical scanning, anchorage, bond, Corrosion, crack width, inspection, pitting
National Category
Infrastructure Engineering Building Technologies Applied Mechanics
Identifiers
urn:nbn:se:ri:diva-27821 (URN)10.1080/15732479.2016.1263673 (DOI)2-s2.0-85007290188 (Scopus ID)
Available from: 2017-01-10 Created: 2017-01-10 Last updated: 2020-05-05Bibliographically 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: 2020-01-22Bibliographically 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
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-4565-5345

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