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Thomas Keller

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Publications associées (309)

Early-age tensile properties of structural epoxy adhesives subjected to low-temperature curing

Julia De Castro San Roman Fest, Thomas Keller, Omar Moussa, Anastasios Vassilopoulos

The early-age mechanical property development of structural adhesives during low temperature curing is critical for the outdoor construction of engineering structures, such as bridges or buildings. Construction of these structures is also carried out durin ...

2012

Instability of Thin-Walled GFRP Webs in Cell-Core Sandwiches under Combined Bending and Shear Loads

Julia De Castro San Roman Fest, Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

An analytical investigation of the buckling/wrinkling behavior of GFRP webs in cell-core sandwiches subjected to combined in-plane shear and bending stresses is conducted. Web-core panels are modeled as long orthotropic plates stabilized by a relatively th ...

2012

Effects of low-temperature curing on physical behavior of cold-curing epoxy adhesives in bridge construction

Thomas Keller, Omar Moussa, Anastasios Vassilopoulos

The effect of low-temperature curing on the physical characteristics of a commercial cold-curing epoxy adhesive was experimentally and analytically investigated with a view to a potential application in bridge construction in winter. Curing at low temperat ...

Elsevier2012

Experimental investigation of the fatigue behavior of adhesively-bonded pultruded GFRP joints under different load ratios

Thomas Keller, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

The fatigue response of adhesively-bonded pultruded GFRP double-lap joints was investigated under different loading patterns and experimental results were obtained for three different applied load ratios: R = 0.1, R = 10, and R = -1. The fatigue life of th ...

Elsevier2011

Fire performance of water-cooled cellular GFRP columns

Thomas Keller, Yu Bai

Structural fire endurance experiments were conducted on full-scale cellular glass fiber reinforced (GFRP) columns under axial compression and subjected to ISO 834 fire exposure from one side. Unprotected columns could resist fire for more than 30 min, whic ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011

Fire performance of water-cooled GFRP columns. Part I: Fire endurance investigation

Thomas Keller, Yu Bai, Christian Ludwig

Structural fire endurance experiments were conducted on full-scale cellular glass fiber-reinforced (GFRP) columns under axial compression and subjected to ISO834 fire exposure from one side. Unprotected columns can resist fire for more than 30 min, which i ...

American Society of Civil Engineers2011

Contribution to shear wrinkling of GFRP webs in cell-core sandwiches

Julia De Castro San Roman Fest, Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Glass-fiber-reinforced polymer (GFRP) cell-core sandwiches are composed of outer GFRP face sheets, a foam core, and a grid of GFRP webs integrated into the core to reinforce the shear load capacity. One of the critical failure modes of cell-core sandwich s ...

American Society of Civil Engineers2011

Shear buckling of GFRP beams webs

Julia De Castro San Roman Fest, Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Slender webs of glass fiber-reinforced polymer (GFRP) beams are sensitive to shear buckling. Shear buckling can bee seen as an in-plane biaxial compression-tension buckling problem. The transverse tensile load thereby delays the onset of buckling and incre ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011

Fatigue life behavior of adhesively bonded pultruded FRP joints under tensile and compressive loading

Thomas Keller, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

2011

Multifunctional and robust composite structures for sustainable infrastructure

Thomas Keller

The multifunctional use of FRP composites offers the potential to contribute to the emergence of a new generation of lightweight engineering structures for an innovative infrastructure that meets the challenges with which today's construction industry is f ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011

Fire Performance of Water-Cooled GFRP Columns. Part II: Postfire Investigation

Thomas Keller, Yu Bai

The postfire mechanical performances of water-cooled full-scale GFRP cellular columns subjected to axial compression were evaluated after exposure to an ISO-834 fire from one side for periods of 60 and 120 mins. The elastic modulus and postfire buckling lo ...

American Society of Civil Engineers2011

A phenomenological analysis of Mode I fracture of adhesively-bonded pultruded GFRP joints

Thomas Keller, Anastasios Vassilopoulos, Moslem Shahverdi

The fracture behavior of adhesively-bonded pultruded joints was experimentally investigated under Mode I loading using double cantilever beam specimens. The pultruded adherends comprised two mat layers on each side with a roving layer in the middle. An epo ...

Elsevier2011

Shear Buckling Resistance of GFRP Plate Girders

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Thin webs of glass-fiber-reinforced polymer (GFRP) girders are sensitive to shear buckling, which can be considered an in-plane biaxial compression-tension buckling problem, according to the rotated stress field theory. An extensive experimental study was ...

American Society of Civil Engineers2011

Effects of thermal loading history on structural adhesive modulus across glass transition

Thomas Keller, Yu Bai

Dynamic Mechanical Analysis was conducted on a polyurethane adhesive at different constant heating rates up to 100°C, covering the glass transition range. Different storage modulus degradation curves were obtained from different heating rates. The differen ...

Elsevier2011

Delamination and kink-band failure of pultruded GFRP laminates under elevated temperatures and compression

Thomas Keller, Yu Bai

Compression experiments were conducted on slender glass fiber-reinforced polymer (GFRP) laminates at different temperatures in the elevated range. Experimental buckling loads, lateral second-order deformations, and shear strength decreased with increasing ...

Elsevier2011

Mechanical recovery of epoxy adhesives subsequent to exceeding glass transition temperature

Julia De Castro San Roman Fest, Thomas Keller, Omar Moussa, Anastasios Vassilopoulos

2011

A computational tool for the life prediction of GFRP laminates under irregular complex stress states: influence of the fatigue failure criterion

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

A new computational tool for the fatigue life prediction of composite materials, designated CCfatigue, is presented in this paper. This new software has been developed based on a well-established phenomenological fatigue life prediction methodology. It is ...

Elsevier2010

Effects of low and high temperatures on tensile behavior of adhesively-bonded GFRP joints

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The tensile behavior of adhesively-bonded double-lap joints composed of pultruded glass fiber-reinforced adherends and an epoxy adhesive was investigated under temperatures ranging between -35°C and 60°C. The load-elongation response was influenced primari ...

2010

Influence of the constant life diagram formulation on the fatigue life prediction of composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

The influence of the constant life diagram (CLD) formulation on the fatigue life prediction of composite materials was examined. Most commonly used and recently proposed CLDs applied on composite materials fatigue data are presented and their applicability ...

Elsevier2010

Thermomechanical behavior of multifunctional GFRP sandwich structures with encapsulated photovoltaic cells

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

The feasibility of encapsulating solar cells into the glass fiber-reinforced polymer (GFRP) skins of load-bearing and thermally insulating sandwich elements with foam cores has been evaluated. Exposure of the encapsulated cells to artificial sunlight led t ...

American Society of Civil Engineers2010

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