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Thomas Keller

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Related publications (309)

Modeling of mechanical response of FRP composites in fire

A thermomechanical model is presented for predicting the time-dependent deflections of cellular FRP slab elements subjected to mechanical loading and fire from one side. The model comprises temperature-dependent mechanical property sub-models for the Young ...

2009

Investigation of 3D moisture diffusion coefficients and damage in a pultruded E-glass/polyester structural composite

Thomas Keller, Florian Riebel

As civil engineers seek to improve buildings and bridges, they are turning to composite materials for some structural components. Thus the long-term life of these materials in damp highly acidic conditions (from concrete pore solutions) is critical. This a ...

2009

Shear failure of pultruded FRP composites under axial compression

Thomas Keller, Yu Bai

When structural elements are subjected to compressive loads, the shear forces and stresses induced by second- order effects may lead to shear failure prior to compressive failure. This is particularly likely to occur in the case of pultruded glass fiber-re ...

2009

Modeling of the fatigue life of adhesively-bonded FRP joints with genetic programming

Thomas Keller, Anastasios Vassilopoulos

2009

Structural behavior of multifunctional GFRP joints for concrete structures

Thomas Keller, Florian Riebel

A multifunctional all-FRP joint has been developed for the transfer of bending moments and shear forces in thermal insulation sections of concrete slab structures used in building construction. Tensile forces from moments are transferred by horizontal GFRP ...

2009

Time dependence of material properties of FRP composites in fire

Thomas Keller, Yu Bai

Temperature dependence of physical and mechanical properties is considered in most thermal and mechanical response models for composite materials. Based on thermogravimetry analysis, differential scanning calorimetry, and dynamic mechanical analysis conduc ...

2009

Through-thickness performance of adhesive joints between FRP bridge decks and steel girders

Thomas Keller, Martin Schollmayer

The through-thickness performance of adhesive joints between pultruded FRP bridge decks and steel girders was investigated experimentally and numerically. Through- thickness tensile stresses occur due to uplift forces caused by the load-bearing behavior of ...

2009

Modeling of direct load transmission in sandwich beams with lightweight concrete

Thomas Keller, Till Vallée, Erika Schaumann

The direct load transmission behavior of hybrid sandwich beams consisting of a bottom fiber-reinforced polymer skin and a top concrete skin was investigated experimentally. The sandwich core consisted of lightweight concretes of different brittleness (sand ...

2009

Environmental effects on fatigue behavior of adhesively-bonded pultruded structural joints

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

The fatigue response of adhesively-bonded pultruded GFRP double-lap joints has been investigated under different environmental conditions. Tests were performed at -35 °C, 23 °C and 40 °C. A fourth set of fatigue data was collected from tests on preconditio ...

2009

Pultruded GFRP posts for railway noise barriers

Thomas Keller, Till Vallée, Florian Riebel

142 (abstract), paper on CD-ROM ...

2008

Acoustic emission analysis and acousto-ultrasonics for damage detection in GFRP adhesive joint

Thomas Keller, Till Vallée

2008

Direct load transfer in hybrid FRP-concrete sandwich structure for bridge decks

Thomas Keller, Till Vallée, Erika Schaumann

2008

Direct load transmission in hybrid FRP and lightweight concrete sandwich bridge deck

Thomas Keller, Till Vallée, Erika Schaumann

Direct load transmission experiments on hybrid short-span beam specimens for a novel bridge deck were performed. The sandwich construction consists of three layers: a fiber- reinforced polymer composite (FRP) sheet with T-upstands for the bottom skin, ligh ...

2008

A kinetic model for predicting stiffness and strength of FRP composites in fire

Thomas Keller, Yu Bai

2008

GFRP posts for railway noise barriers – experimental validation of load-carrying performance and durability

Thomas Keller, Till Vallée, Florian Riebel

As part of a 15-year railway noise remediation plan, 300km of noise barriers will be installed in Switzerland over the next few years. To enable pultruded glass fiber- reinforced polymer (GFRP) materials to be used for the noise barrier posts, a specificat ...

2008

Experimental investigation on temperature-dependent thermo- physical and mechanical properties of pultruded GFRP composites

Thomas Keller, Yu Bai

The temperature-dependent thermo-physical and mechanical properties of a pultruded E-glass fiber-reinforced polyester (GFRP) composite are investigated in this paper. Fitting of theoretical models of the material properties to results of TGA, DSC, hot disk ...

2008

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Thomas Keller

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Modeling of mechanical response of FRP composites in fire

Investigation of 3D moisture diffusion coefficients and damage in a pultruded E-glass/polyester structural composite

Shear failure of pultruded FRP composites under axial compression

Modeling of the fatigue life of adhesively-bonded FRP joints with genetic programming

Structural behavior of multifunctional GFRP joints for concrete structures

Time dependence of material properties of FRP composites in fire

Through-thickness performance of adhesive joints between FRP bridge decks and steel girders

Modeling of direct load transmission in sandwich beams with lightweight concrete

Environmental effects on fatigue behavior of adhesively-bonded pultruded structural joints

Pultruded GFRP posts for railway noise barriers

Acoustic emission analysis and acousto-ultrasonics for damage detection in GFRP adhesive joint

Direct load transfer in hybrid FRP-concrete sandwich structure for bridge decks

Direct load transmission in hybrid FRP and lightweight concrete sandwich bridge deck

A kinetic model for predicting stiffness and strength of FRP composites in fire

GFRP posts for railway noise barriers – experimental validation of load-carrying performance and durability

Experimental investigation on temperature-dependent thermo- physical and mechanical properties of pultruded GFRP composites

Direct load transmission in sandwich slabs with lightweight concrete core

Modeling of thermo-mechanical properties and responses for FRP composites in fire

Direct load transfer in hybrid FRP-concrete sandwich structure for bridge decks

Flexural behavior of a hybrid FRP-concrete sandwich bridge deck