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  • 1.
    Blomfors, Mattias
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Larsson, Oskar
    Lund University, Sweden.
    Honfi, Daniel
    RISE., SP – Sveriges Tekniska Forskningsinstitut.
    Engineering Assessment Method for Anchorage in Corroded Reinforced Concrete2016Ingår i: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, s. 2109-2116Konferensbidrag (Refereegranskat)
    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.

  • 2.
    Honfi, Daniel
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Williams Portal, Natalie
    RISE - Research Institutes of Sweden, Säkerhet och transport, Safety.
    Leander, John
    KTH Royal Institute of Technology, Sweden.
    Larsson Ivanov, Oskar
    Lund University, Sweden.
    Björnsson, Ívar
    Lund University, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    Chalmers University of Technology, Sweden.
    Carneiro, Erica
    NCC AB, Sweden.
    Lechner, Thomas
    NCC AB, Sweden.
    Magnusson, Jonas
    NCC AB, Sweden.
    Gabrielsson, Henrik
    Tyréns AB, Sweden.
    Inspection and monitoring of bridges in Sweden2018Rapport (Övrigt vetenskapligt)
    Abstract [en]

    This report provides an overview about recent research activities and current practice concerning inspection and monitoring of the structural performance of bridges and the related decision-making process. A brief review of common methods of collecting information on structural performance of bridges is presented, followed by a description of the use of the information collected in structural analysis and maintenance planning. An overview about the state of the art is given including recent scientific developments. Finally, the current Swedish practice for bridge management is presented.

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  • 3.
    Lundgren, K.
    et al.
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Nilsson, U.
    Ramböll Sverige AB, Sweden.
    A model for the anchorage of corroded reinforcement: Validation and application2015Ingår i: Concrete - Innovation and Design: fib Symposium Proceedings, Technical University of Denmark , 2015, s. 135-136Konferensbidrag (Refereegranskat)
    Abstract [en]

    When reinforcement in concrete corrodes, splitting stresses around corroded bars may lead to cover cracking and even cover spalling, affecting the anchorage. The aim of this study was to validate an existing one-dimensional (1D) analysis for anchorage capacity, and to show how it can be applied in assessment of existing bridges. The 1D analysis was validated through comparisons to experiments and detailed 30 finite element analyses. The methodology is exemplified in assessment of two bridges built in the 1960s. The bridges exhibit systematic damage in the form of spalled concrete on the bottom side of the main beams at cast joints where large amounts of reinforcement are spliced. The anchorage length needed to anchor the yield force was calculated from the bond-slip response, using the one-dimensional bond-slip differential equation. The model proved to be easy to use in practical design work. Furthermore, the bridges could be shown to have sufficient capacity, and costly strengthening could be avoided. This work clearly demonstrates the potential to certify sufficient load-carrying capacity of corroded reinforced concrete structures through improved models.

  • 4.
    Miccoli, Lorenzo
    et al.
    BAM Federal Institute for Materials Research and Testing, Germany.
    Fontana, Patrick
    BAM Federal Institute for Materials Research and Testing, Germany.
    Johansson, Gabriel
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Tillståndsbedömningar.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Williams Portal, Natalie
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Mueller, Urs
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Numerical modelling of UHPC and TRC sandwich elements for building envelopes2015Ingår i: IABSE Conference 2015: Structural Engineering: Providing Solutions to Global Challenges, IABSE , 2015, s. 195-203Konferensbidrag (Refereegranskat)
    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.

  • 5.
    Plos, Mario
    et al.
    Chalmers University of Technology, Sweden.
    Shu, Jiangpeng
    Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    A multi-level structural assessment strategy for analysis of RC bridge deck slabs2016Ingår i: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, s. 1559-1566Konferensbidrag (Refereegranskat)
    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.

  • 6.
    Plos, Mario
    et al.
    Chalmers University of Technology, Sweden.
    Shu, Jiangpeng
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet. Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    A multi-level structural assessment strategy for reinforced concrete bridge deck slabs2017Ingår i: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 13, nr 2, s. 223-241Artikel i tidskrift (Refereegranskat)
    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.

  • 7.
    Shu, Jiangpeng
    et al.
    Chalmers University of Technology, Sweden.
    Fall, David
    Chalmers University of Technology, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg. Chalmers University of Technology, Sweden.
    Lundgren, Karin
    Chalmers University of Technology, Sweden.
    Development of modelling strategies for two-way RC slabs2015Ingår i: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 101, s. 439-449Artikel i tidskrift (Refereegranskat)
    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.

  • 8.
    Shu, Jiangpeng
    et al.
    Chalmers University of Technology, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Nilenius, Filip
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg. Chalmers University of Technology, Sweden.
    Johansson, Morgan
    Chalmers University of Technology, Sweden; ÅF Infrastructure AB, Sweden.
    Prediction of punching behaviour of RC slabs using continuum nonlinear FE analysis2016Ingår i: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, s. 1629-1636Konferensbidrag (Refereegranskat)
    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.

  • 9.
    Shu, Jiangpeng
    et al.
    Chalmers University of Technology, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg. Chalmers University of Technology, Sweden.
    Johansson, Morgan
    Chalmers University of Technology, Sweden; Reinertsen Sweden AB, Sweden.
    Numerical prediction of punching behavior of RC slabs using 3D non-linear FE analysis2016Ingår i: 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, s. 1607-1611Konferensbidrag (Refereegranskat)
    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.

  • 10.
    Shu, Jiangpeng
    et al.
    Chalmers University of Technology, Sweden.
    Plos, Mario
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg. Chalmers University of Technology, Sweden.
    Johansson, Morgan
    Chalmers University of Technology, Sweden; ÅF, Sweden.
    Nilenius, Filip
    Chalmers University of Technology, Sweden.
    Prediction of punching behaviour of RC slabs using continuum non-linear FE analysis2016Ingår i: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 125, s. 15-25Artikel i tidskrift (Refereegranskat)
    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.

  • 11.
    Tahershamsi, M.
    et al.
    Chalmers University of Technology, Sweden.
    Fernandez, I.
    Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE - Research Institutes of Sweden, Samhällsbyggnad, CBI Betonginstitutet. Chalmers University of Technology, Sweden.
    Lundgren, K.
    Chalmers University of Technology, Sweden.
    Four levels to assess anchorage capacity of corroded reinforcement in concrete2017Ingår i: Engineering structures, ISSN 0141-0296, E-ISSN 1873-7323, Vol. 147, s. 434-447Artikel i tidskrift (Refereegranskat)
    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.

  • 12.
    Tahershamsi, Mohammad
    et al.
    Chalmers University of Technology, Sweden.
    Fernandez, Ignasi
    Chalmers University of Technology, Sweden.
    Lundgren, Karin
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet. Chalmers University of Technology, Sweden.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg. Chalmers University of Technology, Sweden.
    Investigating correlations between crack width, corrosion level and anchorage capacity2017Ingår i: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 13, nr 10, s. 1294-1307Artikel i tidskrift (Refereegranskat)
    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.

  • 13.
    Williams Portal, Natalie
    et al.
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Flansbjer, Mathias
    RISE - Research Institutes of Sweden (2017-2019), Säkerhet och transport, Safety.
    Zandi, Kamyab
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Wlasak, Lech
    Mostostal Warszawa SA, Poland.
    Malaga, Katarina
    RISE - Research Institutes of Sweden (2017-2019), Samhällsbyggnad, CBI Betonginstitutet.
    Bending behaviour of novel Textile Reinforced Concrete-foamed concrete (TRC-FC) sandwich elements2017Ingår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 177, s. 104-118Artikel i tidskrift (Refereegranskat)
    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.

  • 14.
    Williams Portal, Natalie
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB, Betong & Berg.
    Malaga, Katarina
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
    Wlasak, Lech
    Mostostal Warszawa SA, Poland.
    GFRP connectors in textile reinforced concrete sandwich elements2016Ingår i: IABSE Congress Stockholm 2016: Challenges in Design and Construction of an Innovative and Sustainable Built Environment, IABSE c/o ETH Hönggerberg , 2016, s. 1336-1343Konferensbidrag (Refereegranskat)
    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.

  • 15.
    Zandi, Kamyab
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Corrosion-induced cover spalling and anchorage capacity2015Ingår i: Structure and Infrastructure Engineering, ISSN 1573-2479, E-ISSN 1744-8980, Vol. 11, nr 12, s. 1547-1564Artikel i tidskrift (Refereegranskat)
    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.

  • 16.
    Zandi, Kamyab
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB. Chalmers University of Technology, Sweden.
    Lundgren, K.
    Chalmers University of Technology, Sweden.
    Numerical 3D modelling of anchorage, corrosion and spalling2015Ingår i: Concrete - Innovation and Design: fib Symposium Proceedings, Technical University of Denmark , 2015, s. 331-332Konferensbidrag (Refereegranskat)
    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 objective was to study the influence of corrosion-induced cover spalling on bond strength. Thus, earlier developed bond and corrosion models suited for detailed 30 fnite element (FE) analysis were first combined with a new computation scheme to simulate corrosion-induced cover spalling. The 30 FE analyses were validated through experiments. The application of 30 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 early yielding of stirrups had not taken place. Moreover, it was shown that stresses in the stirrups due to corrosion in adjacent bars rapidly diminished within a short distance fom the main bar, and that the corrosion of stirrups influenced the shear capacity more prominent than the induced stresses in stirrups due to the corrosion of main bars.

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