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Papers by Therese Tajeuna

Research paper thumbnail of Resistance and failure modes of cold-formed lipped angle subjected to tensile load

Cold-formed steel angles could be an advantageous alterative to hot rolled steel angle for the ap... more Cold-formed steel angles could be an advantageous alterative to hot rolled steel angle for the application of light-weight electrical transmission towers. However, standard design equations to evaluate the resistance and failure modes in tension of angles connected with bolts on one leg only were not specifically developed and validated for the application of lipped angles. In particular, the phenomenon of shear lag on this type of angle is difficult to evaluate. In this paper, the behavior of cold-formed steel lippedangle with typical transmission tower bolted connections is studied. At first, experimental tests on two and three bolts connections are performed. Tensile load is applied on a single angle configuration to investigate the failures mode and capacity of the connected members. Then, three dimension (3D) finite element (EF) models of the bolted members are developed. The accuracy of the FE models is validated by the good agreement with experimental study. Results obtained ...

Research paper thumbnail of Effect of geometrical parameters of aluminum-to-steel bolted connections

Engineering Structures, 2015

Through experimental and numerical studies, this research work aims to provide directions on the ... more Through experimental and numerical studies, this research work aims to provide directions on the optimal geometric configuration for single-lap and double-lap bolted connection between aluminum alloy 6061-T6 and steel. From experimental test results, the effects of different geometric parameters on the joint strength were discussed. These parameters include the end-distance, the side-distance, the pitch-distance, the plate thickness and the joint eccentricity. Then, the experimental results were compared to predicted results using design references and geometric recommendations proposed by design references were critically examined. The experimental study was complemented by finite element (FE) analysis to extend the study to a larger range of parameters. In addition to the analysis of the geometric parameters listed above, the effects of the gage-distance on the joint strength were studied in the FE analysis. The experimental and finite element results show that a careful selection of geometric parameters can result in the high improvement of the connection strength and failure mode. Limiting the side-distance to the minimum recommended value was found to limit the strength of a connection with two bolts in a column to that of the one-bolt connection. In most cases, bearing was found to govern the strength of the connections. The calculated bearing strengths were found to underestimate significantly the connection strength. Based on these analyses, maximum geometric parameters beyond which there is no further increase of the joint capacity were evaluated and optimum geometric parameters were proposed.

Research paper thumbnail of Effect of geometric parameters on the behavior of bolted GFRP pultruded plates

Journal of Composite Materials, 2016

This paper presents the effect of geometric parameters on the behavior of bolted glass fibre rein... more This paper presents the effect of geometric parameters on the behavior of bolted glass fibre reinforced polymer (GFRP) pultruded plates for civil engineering applications. After a literature review, results of an experimental analysis investigating the behavior of GFRP-to-steel single-lap bolted connections are presented. Then, a finite element analysis validated by experimental data is used to evaluate the effects of the end-distance, side-distance, pitch, and plate properties on the strength and failure mode of the connection. A critical examination of geometric recommendations proposed in design references is presented. Bearing failure caused by contact of the bolt on the GFRP plate is usually defined as the preferred failure mode. With highly orthotropic plate, this type of failure was found to be less likely to occur when loading is applied in the pultruded direction. The investigation showed that the minimum end-distance and pitch-distance recommended by design references usua...

Research paper thumbnail of Experimental Investigation of Multi-Material Aluminum-to-Steel and GFRP-to-Steel Bonded and Bolted/Bonded Connections

Canadian Journal of Civil Engineering, 2016

Through an experimental study, this paper describes the behavior of single-lap bonded and bolted–... more Through an experimental study, this paper describes the behavior of single-lap bonded and bolted–bonded connections for configurations with minimum geometric parameters proposed in design references. Two types of multi-material connections are considered: glass fiber reinforced polymer (GFRP)–steel and aluminum–steel. At first, the behavior of bonded connections using methacrylate and epoxy adhesives is evaluated. Then, the contribution of adhesive in bolted connections is investigated. Test results show that on bonded joints, failures mostly occur at the substrate to adhesive interface. Sanding the GFRP plate was found to improve the connection strength. Despite their lower elastic modulus, methacrylate adhesives with larger capacity to undergo plastic deformation provide better strength than other methacrylate and epoxy adhesives. For bolted–bonded joints, the adhesive was found to improve the elastic behavior and the strength of GFRP–steel joints while its effect for aluminum–ste...

Research paper thumbnail of Effect of geometrical parameters of aluminum-to-steel bolted connections

Engineering Structures, 2015

Through experimental and numerical studies, this research work aims to provide directions on the ... more Through experimental and numerical studies, this research work aims to provide directions on the optimal geometric configuration for single-lap and double-lap bolted connection between aluminum alloy 6061-T6 and steel. From experimental test results, the effects of different geometric parameters on the joint strength were discussed. These parameters include the end-distance, the side-distance, the pitch-distance, the plate thickness and the joint eccentricity. Then, the experimental results were compared to predicted results using design references and geometric recommendations proposed by design references were critically examined. The experimental study was complemented by finite element (FE) analysis to extend the study to a larger range of parameters. In addition to the analysis of the geometric parameters listed above, the effects of the gage-distance on the joint strength were studied in the FE analysis. The experimental and finite element results show that a careful selection of geometric parameters can result in the high improvement of the connection strength and failure mode. Limiting the side-distance to the minimum recommended value was found to limit the strength of a connection with two bolts in a column to that of the one-bolt connection. In most cases, bearing was found to govern the strength of the connections. The calculated bearing strengths were found to underestimate significantly the connection strength. Based on these analyses, maximum geometric parameters beyond which there is no further increase of the joint capacity were evaluated and optimum geometric parameters were proposed.

Research paper thumbnail of Resistance and failure modes of cold-formed lipped angle subjected to tensile load

Cold-formed steel angles could be an advantageous alterative to hot rolled steel angle for the ap... more Cold-formed steel angles could be an advantageous alterative to hot rolled steel angle for the application of light-weight electrical transmission towers. However, standard design equations to evaluate the resistance and failure modes in tension of angles connected with bolts on one leg only were not specifically developed and validated for the application of lipped angles. In particular, the phenomenon of shear lag on this type of angle is difficult to evaluate. In this paper, the behavior of cold-formed steel lippedangle with typical transmission tower bolted connections is studied. At first, experimental tests on two and three bolts connections are performed. Tensile load is applied on a single angle configuration to investigate the failures mode and capacity of the connected members. Then, three dimension (3D) finite element (EF) models of the bolted members are developed. The accuracy of the FE models is validated by the good agreement with experimental study. Results obtained ...

Research paper thumbnail of Effect of geometrical parameters of aluminum-to-steel bolted connections

Engineering Structures, 2015

Through experimental and numerical studies, this research work aims to provide directions on the ... more Through experimental and numerical studies, this research work aims to provide directions on the optimal geometric configuration for single-lap and double-lap bolted connection between aluminum alloy 6061-T6 and steel. From experimental test results, the effects of different geometric parameters on the joint strength were discussed. These parameters include the end-distance, the side-distance, the pitch-distance, the plate thickness and the joint eccentricity. Then, the experimental results were compared to predicted results using design references and geometric recommendations proposed by design references were critically examined. The experimental study was complemented by finite element (FE) analysis to extend the study to a larger range of parameters. In addition to the analysis of the geometric parameters listed above, the effects of the gage-distance on the joint strength were studied in the FE analysis. The experimental and finite element results show that a careful selection of geometric parameters can result in the high improvement of the connection strength and failure mode. Limiting the side-distance to the minimum recommended value was found to limit the strength of a connection with two bolts in a column to that of the one-bolt connection. In most cases, bearing was found to govern the strength of the connections. The calculated bearing strengths were found to underestimate significantly the connection strength. Based on these analyses, maximum geometric parameters beyond which there is no further increase of the joint capacity were evaluated and optimum geometric parameters were proposed.

Research paper thumbnail of Effect of geometric parameters on the behavior of bolted GFRP pultruded plates

Journal of Composite Materials, 2016

This paper presents the effect of geometric parameters on the behavior of bolted glass fibre rein... more This paper presents the effect of geometric parameters on the behavior of bolted glass fibre reinforced polymer (GFRP) pultruded plates for civil engineering applications. After a literature review, results of an experimental analysis investigating the behavior of GFRP-to-steel single-lap bolted connections are presented. Then, a finite element analysis validated by experimental data is used to evaluate the effects of the end-distance, side-distance, pitch, and plate properties on the strength and failure mode of the connection. A critical examination of geometric recommendations proposed in design references is presented. Bearing failure caused by contact of the bolt on the GFRP plate is usually defined as the preferred failure mode. With highly orthotropic plate, this type of failure was found to be less likely to occur when loading is applied in the pultruded direction. The investigation showed that the minimum end-distance and pitch-distance recommended by design references usua...

Research paper thumbnail of Experimental Investigation of Multi-Material Aluminum-to-Steel and GFRP-to-Steel Bonded and Bolted/Bonded Connections

Canadian Journal of Civil Engineering, 2016

Through an experimental study, this paper describes the behavior of single-lap bonded and bolted–... more Through an experimental study, this paper describes the behavior of single-lap bonded and bolted–bonded connections for configurations with minimum geometric parameters proposed in design references. Two types of multi-material connections are considered: glass fiber reinforced polymer (GFRP)–steel and aluminum–steel. At first, the behavior of bonded connections using methacrylate and epoxy adhesives is evaluated. Then, the contribution of adhesive in bolted connections is investigated. Test results show that on bonded joints, failures mostly occur at the substrate to adhesive interface. Sanding the GFRP plate was found to improve the connection strength. Despite their lower elastic modulus, methacrylate adhesives with larger capacity to undergo plastic deformation provide better strength than other methacrylate and epoxy adhesives. For bolted–bonded joints, the adhesive was found to improve the elastic behavior and the strength of GFRP–steel joints while its effect for aluminum–ste...

Research paper thumbnail of Effect of geometrical parameters of aluminum-to-steel bolted connections

Engineering Structures, 2015

Through experimental and numerical studies, this research work aims to provide directions on the ... more Through experimental and numerical studies, this research work aims to provide directions on the optimal geometric configuration for single-lap and double-lap bolted connection between aluminum alloy 6061-T6 and steel. From experimental test results, the effects of different geometric parameters on the joint strength were discussed. These parameters include the end-distance, the side-distance, the pitch-distance, the plate thickness and the joint eccentricity. Then, the experimental results were compared to predicted results using design references and geometric recommendations proposed by design references were critically examined. The experimental study was complemented by finite element (FE) analysis to extend the study to a larger range of parameters. In addition to the analysis of the geometric parameters listed above, the effects of the gage-distance on the joint strength were studied in the FE analysis. The experimental and finite element results show that a careful selection of geometric parameters can result in the high improvement of the connection strength and failure mode. Limiting the side-distance to the minimum recommended value was found to limit the strength of a connection with two bolts in a column to that of the one-bolt connection. In most cases, bearing was found to govern the strength of the connections. The calculated bearing strengths were found to underestimate significantly the connection strength. Based on these analyses, maximum geometric parameters beyond which there is no further increase of the joint capacity were evaluated and optimum geometric parameters were proposed.