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Thomas Keller

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Publications associées (309)

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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

Composite action and adhesive bond between fiber- reinforced polymer bridge decks and main girders

Thomas Keller, Herbert Gürtler

This paper describes the behavior of hybrid girders consisting of fiber-reinforced polymer (FRP) bridge decks adhesively connected to steel main girders. Two large-scale girders were experimentally investigated at the serviceability and ultimate limit stat ...

2005

Punching shear of RC flat slabs - Review of analytical models for new and strengthening of existing slabs

Thomas Keller, Robert Koppitz

The conversion of existing buildings, development of standards, material deterioration and detailing deficiencies have led to a need for strengthening an increasing number of concrete flat slabs against brittle punching shear failure. However, existing ana ...

Elsevier2013

Adhesively bonded lap joints from pultruded GFRP profiles. Part II: joint strength prediction

Thomas Keller, Till Vallée

A method to predict the strength of adhesively bonded single and double lap joints from pultruded GFRP composite adherends subjected to quasi-static axial tensile loading is presented. The method is based on a quadratic through- thickness shear-tensile int ...

2005

Structural response of liquid-cooled GFRP slabs subjected to fire - Part I: Material and post-fire modeling

Thomas Keller, Craig Tracy

Temperature-dependent material properties of glass fiber-reinforced polymer composites were derived from tests performed on the material itself, from references concerned with similar polymer materials and from observations during full-scale fire experimen ...

Elsevier2006

Overview and Aspects of the European Technical Specification CEN/TS 19101:2022, "design of Fibre-Polymer Composite Structures"

Thomas Keller

In November 2022, the European Committee for Standardization (CEN) published the Technical Specification CEN/TS 19101:2022, "Design of Fibre-Polymer Composite Structures."These design provisions, which follow the philosophy and partial factor format of the ...

2024

Effect of service temperature on the shear creep response of rigid polyurethane foam used in composite sandwich floor panels

Thomas Keller

This paper presents an experimental and analytical study about the effect of temperature on the shear creep response of a rigid polyurethane (PUR) foam within the scope of sandwich panel application in building floors. Shear creep tests were carried out on ...

Elsevier2016

Neutron resonance spin-echo upgrade at the three-axis spectrometer FLEXX

Thomas Keller, Felix Groitl

We describe the upgrade of the neutron resonance spin-echo setup at the cold neutron triple-axis spectrometer FLEXX at the BER II neutron source at the Helmholtz-Zentrum Berlin. The parameters of redesigned key components are discussed, including the radio ...

American Institute of Physics2015

Analytical modeling of local stresses at Balsa/timber core joints of FRP sandwich structures

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Michael Osei-Antwi

In order to optimize sandwich structures, core materials of different density and thus different stiffness and strength are often combined. The material discontinuities at joints of dissimilar core materials may lead to abrupt changes of the shear angles a ...

Elsevier2014

Prefabricated thermally-activated fiber-polymer composite building slab P-TACS: Toward the multifunctional and pre-fabricated structural elements in buildings

Thomas Keller, Dolaana Khovalyg

The traditional sequential design of building elements, where every element performs only one dedicated function, carries significant embodied energy. Thus, modular pre-fabricated load-bearing elements could overcome the disadvantages of the current carbon ...

SAGE PUBLICATIONS LTD2023

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

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

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

Short-term behavior of glass fiber-polymer composite bending-active elastica beam under service load application

Thomas Keller, Landolf-Giosef-Anastasios Rhode-Barbarigos, Tara Habibi

Bending-active elastica beam is a structural configuration that is based on the elastic deformation of an initially straight beam. This deformation occurs when horizontal displacements are applied to a sliding support, causing the beam to bend into an arch ...

2024

Structural performance of FRP composites in fire

Thomas Keller, Yu Bai

This paper reviews the experimental and modeling work that has been carried out concerning the behavior of fiber-reinforced polymer (FRP) composites in fire since the 1980s. The first part focuses on the thermophysical properties and temperature responses, ...

Multi-Science Publishing2010

Effects of elevated temperature on the shear response of PET and PUR foams used in composite sandwich panels

Thomas Keller

Composite sandwich panels comprising fibre reinforced polymer (FRP) skins and lightweight material cores are being increasingly used in civil engineering. In several applications, such as fa ades, roof structures and bridge decks, these panels may experien ...

Elsevier2015

In-plane compression and shear performance of FRP bridge decks acting as top chord of bridge girders

Thomas Keller, Herbert Gürtler

This paper reports on the composite action developed between pultruded FRP bridge deck systems and the supporting main girders for road bridges. Presented are requirements that an FRP deck must satisfy in order to function as part of the upper chord of the ...

2006

A novel methodology of predicting temperature and rate effects on tensile properties of viscoelastic materials

Thomas Keller

A novel methodology to predict the tensile properties of viscoelastic materials as a synergistic function of temperature and loading/displacement rate is presented in this paper. The model is based on the amount of energy dissipated during tensile loading, ...

Pergamon-Elsevier Science Ltd2023

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

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles, part I: Experimental and numerical investigations

Thomas Keller, Till Vallée

Experimental and numerical investigations were carried out on adhesively bonded full-scale double lap joints composed of pultruded GFRP profiles with relatively thick adhesive layers. Thick adhesive layers are often used in infrastructure applications in o ...

2006

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

Yi Zhang, Thomas Keller, Anastasios Vassilopoulos

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

Tension-tension fatigue behavior of basalt composite hybrid joints

Thomas Keller, Lulu Liu

The tension–tension fatigue behavior of pseudo-ductile hybrid bonded-bolted double lap basalt composite joints, composed of pseudo-ductile adhesives and adherends with multi-directional fiber architecture, was experimentally investigated. The fatigue damag ...

2024