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Related publications (309)

Page 5 of 16

Adhesively bonded lap joints from pultruded GFRP profiles. Part III: Effects of chamfers

Thomas Keller, Till Vallée

Quasi-static axial tension experiments were performed in a laboratory environment on epoxy bonded, balanced double-lap joints composed of pultruded GFRP flat profiles. The parameters investigated were the overlap length (from 50 to 100 mm), the adhesive la ...

2006

Joining techniques for fiber reinforced polymer composite bridge deck systems

Thomas Keller

Bridge decks made from fiber reinforced polymer (FRP) composites have been increasingly used in rehabilitation and new construction of pedestrian and highway bridges. For each application, connections are inevitable due to limitations on shape size and the ...

2005

Generalized resolution matrix for neutron spin-echo three-axis spectrometers

Thomas Keller, Felix Groitl

This article describes the energy resolution of spin-echo three-axis spectrometers (SE-TASs) by a compact matrix formalism. SE-TASs allow one to measure the line widths of elementary excitations in crystals, such as phonons and magnons, with an energy reso ...

INT UNION CRYSTALLOGRAPHY2018

Probabilistic strength prediction for double lap joints composed of pultruded GFRP profiles, part II: Strength prediction

Thomas Keller, Till Vallée

A probabilistic method for the strength prediction of adhesively bonded double lap joints composed of pultruded GFRP adherends subjected to quasi-static axial tensile loading is presented. The prediction method is based on the experimentally determined mat ...

2006

Shear Buckling Resistance of GFRP Plate Girders

Thomas Keller, Anastasios Vassilopoulos, Behzad Dehghan Manshadi

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

Mixed-Mode I/II fracture behavior of asymmetric adhesively-bonded pultruded composite joints

Thomas Keller, Anastasios Vassilopoulos, Moslem Shahverdi

The mixed-mode fracture behavior of adhesively-bonded pultruded glass fiber-reinforced polymer joints was experimentally investigated using asymmetric mixed-mode bending specimens. The crack propagated along paths outside the symmetry plane and, therefore, ...

Elsevier2014

Neutron Larmor diffraction investigation of the rare-earth pyrochlores R2Ti2O7 (R = Tb, Dy, Ho)

Thomas Keller, Felix Groitl

In this work, we present a neutron Larmor diffraction study of the rare-earth pyrochlores R2Ti2O7 with R = Tb, Dy, Ho. We measured the temperature dependence of the lattice parameter with precision 10(-5), between 0.5 and 300 K in each of the three compoun ...

Amer Physical Soc2016

Total light transmittance of glass fiber-reinforced polymer laminates for multifunctional load-bearing structures

Thomas Keller, Anastasios Vassilopoulos, Andreas Schueler, Julia De Castro San Roman Fest, Carlos Pascual Agullo

The total light transmittance of hand lay-up glass fiber-reinforced polymer laminates for building construction was investigated with a view to two architectural applications: translucent load-bearing structures and the encapsulation of photovoltaic cells ...

SAGE Publications2014

Performance in Transverse Direction of Fiber‐Reinforced Polymer Bridge Decks

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

Pultruded glass fiber‐reinforced polymer (GFRP) bridge decks distribute punctual vehicular loads to the underlying superstructure and can also act as the upper chord of hybrid main girders. The deck’s structural performance in both cases is influenced by i ...

International Association for Bridge and Structural Engineering - IABSE2015

Mechanical properties of FRP materials at elevated temperature-Definition of a temperature conversion factor for design in service conditions

Thomas Keller

One of the main concerns about the use of fibre-reinforced polymer (FRP) materials in civil engineering struc-tures is the potential reduction of their stiffness-and strength-related properties when exposed to elevated temperature. This concern, mostly due ...

ELSEVIER SCI LTD2023

Effect of service temperature on the flexural creep of vacuum infused GFRP laminates used in sandwich floor panels

Thomas Keller

This paper presents an experimental and analytical study about the effect of temperature on the flexural creep of GFRP laminates produced by vacuum infusion. Such laminates are considered for use in the faces of sandwich panels for building floor applicati ...

Elsevier2016

Two-dimensional fatigue debonding in GFRP/balsa sandwich panels

Thomas Keller, Anastasios Vassilopoulos, Aida Cameselle Molares

An experimental investigation of the two-dimensional (2D) debonding behavior of GFRP/balsa sandwich panels with embedded circular disbonds at the face sheet/core interface subjected to out-of-plane fatigue loads was conducted. The constant amplitude fatigu ...

2019

Development of physical and mechanical properties of a cold-curing structural adhesive in a dry bridge environment

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

The effect of physical aging and continuation of curing on the physical and mechanical properties of a commercial cold-curing structural epoxy adhesive used in bridge construction has been investigated during the first year. Since adhesive bridge joints ar ...

2017

Fire endurance of loaded and liquid-cooled GFRP slabs for construction

Thomas Keller, Craig Tracy

This paper presents an experimental study on the fire behavior of glass fiber-reinforced polymer (GFRP) load- carrying slabs for building and bridge applications. Fire experiments were performed on cellular full-scale slabs with and without internal liquid ...

2006

Total light transmittance of GFRP laminates for building construction

Thomas Keller, Anastasios Vassilopoulos, Julia De Castro San Roman Fest, Carlos Pascual Agullo

The total light transmittance of hand lay-up glass fiber-reinforced polymer (GFRP) laminates for building construction was investigated for the purpose of two architectural applications: translucent load-bearing building envelopes and the encapsulation of ...

2014

Towards multifunctional building elements: thermal activation of a composite interior GFRP slab

Thomas Keller, Dolaana Khovalyg, Madeline Pugin

Modular multifunctional building elements can overcome major disadvantages of the traditional sequential design and become prospective design solutions for sustainable construction. Thus, this work explores lightweight glass fiber-reinforced polymer (GFRP) ...

IOP Science2021

Fiber-polymer composites for permanent large-scale bending-active elastica beams

Thomas Keller, Tara Habibi

Bending-active represents a structural typology whose geometry is based on the elastic deformation of initially straight members that, in the case of beams, are known as elastica. Until now, fiber-polymer composites were used only for small-scale temporary ...

ELSEVIER SCI LTD2022

Finite element analysis of initial imperfection effects on kinking failure of unidirectional glass fiber-reinforced polymer composites

Thomas Keller, Anastasios Vassilopoulos, Wei Sun

The compressive kinking behavior of non-slender unidirectional glass fiber-reinforced polymer (GFRP) specimens has been analyzed by finite element (FE) models. The experimentally observed imperfections, including the initial fiber waviness throughout the e ...

ELSEVIER SCI LTD2018

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

Thomas Keller, Till Vallée, Erika Schaumann

2008

Long-term design of GFRP-PUR web-core sandwich structures

Thomas Keller, Julia De Castro San Roman Fest, Sonia Yanes Armas

2018