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Related publications (309)

Page 8 of 16

Variable amplitude fatigue of adhesively-bonded pultruded GFRP joints

Thomas Keller, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

The fatigue behavior of adhesively-bonded pultruded GFRP joints subjected to variable amplitude loading patterns was experimentally investigated. The failure mode of the examined joints was found to be similar to that under constant amplitude loading. The ...

Elsevier Sci Ltd2013

Two-dimensional quasi-static debonding in GFRP/balsa sandwich panels

Thomas Keller, Anastasios Vassilopoulos, Aida Cameselle Molares

The two-dimensional (2D) debonding behavior of GFRP/balsa sandwich panels presenting embedded circular disbonds at the face sheet/core interface was experimentally investigated. The bottom of the panels was fixed and out-of-plane quasi-static tensile loads ...

2019

Ductility of adhesively bonded timber joints

Thomas Keller, Anastasios Vassilopoulos, Myrsini Angelidi

In the field of timber engineering, adhesive bonding remains a promising, though poorly developed, joining technique that may increase the structural stiffness and capacity of timber joints and structures. Selecting ductile adhesives may further allow to c ...

WIT Press2017

Effect of Loading Pattern on Fatigue Behavior of Laminated Composites

Thomas Keller, Anastasios Vassilopoulos, Abdolvahid Movahedirad

The effect of load interruptions on the fatigue behavior of (±45)2s angle-ply glass/epoxy composite laminates was investigated in this work. Constant amplitude fatigue experiments were performed at different stress levels to derive base line fatigue data. ...

MDPI2018

Ductility of civil engineering structures incorporating fibre reinforced polymers (FRPs)

Thomas Keller

The special issue of the Construction and Building Materials journal has 14 papers covering a spectrum of studies from leading researchers the world over into the ductility characteristics of structural components or structures incorporating FRPs (fiber re ...

Elsevier2013

Modeling the constant amplitude fatigue behavior of adhesively bonded pultruded GFRP joints

Thomas Keller, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz

The constant amplitude fatigue behavior of adhesively bonded pultruded glass fiber reinforced polymer double-lap joints were modeled by a number of conceptually different phenomenological SN (cyclic stress vs. number of cycle) formulations. An extended dat ...

Brill Academic Publishers2013

Punching shear strengthening of flat slabs using prestressed carbon fiber-reinforced polymer straps

Thomas Keller, Robert Koppitz

An experimental study of full-scale reinforced concrete flat slabs crosswise strengthened with prestressed carbon fiber-reinforced polymer (CFRP) straps against punching shear was performed. The effects of two strap anchoring systems and of slab thickness ...

Elsevier2014

Effects of load interruption on the fatigue life of GFRP composites

Thomas Keller, Anastasios Vassilopoulos, Abdolvahid Movahedirad

The effect of cyclic loading interruption on the fatigue behavior of angle-ply (±45)2S glass/epoxy composite laminates was investigated by comparing the obtained results of continuous- and interrupted loading patterns. Continuous fatigue experiments were p ...

2018

Fatigue performance of a cold-curing structural epoxy adhesive subjected to moist environments

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

This paper presents the results of an experimental program designed to study the effects of aging and a wet environment on the fatigue behavior of epoxy resins used in bridge applications. Specimens were manufactured, cured, and treated, before the experim ...

Elsevier2017

Integration of dye solar cells in load- bearing translucent glass fiber- reinforced polymer laminates

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

The encapsulation of dye solar cells in translucent, structural and lightweight glass fiber-reinforced polymer laminates was investigated with a view to designing multifunctional envelopes for daylit buildings. Small and large integrating sphere experiment ...

SAGE Publications2017

Mixed-mode fracture of adhesively-bonded pultruded composite lap joints

Yi Zhang, Thomas Keller, Anastasios Vassilopoulos

The fracture behavior of adhesively-bonded double- and stepped-lap joints composed of pultruded glass fiber-reinforced polymer composite laminates and subjected to axial tension was experimentally investigated and numerically modeled. Two methods were used ...

Elsevier2010

FRP-Balsa Composite Sandwich Bridge Deck with Complex Core Assembly

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

The aim of this work was to investigate to what extent the performance of a glass fiber-reinforced polymer (GFRP) sandwich slab-bridge with a uniform high-density balsa core could be improved in terms of structural efficiency and weight by using a more com ...

American Society of Civil Engineers2013

Design of fibre-polymer composite structures: Commentary to European technical specification CEN/TS 19101: 2022

Thomas Keller

The European Technical Specification CEN/TS 19101:2022, "Design of Fibre-Polymer Composite Structures", constitutes a milestone for the use of fibre-polymer composites in civil engineering works. This book comprises around 400 background reports covering t ...

CRC Press2025

Anomalous thermal decoherence in a quantum magnet measured with neutron spin echo spectroscopy

Thomas Keller, Felix Groitl

The effect of temperature dependent asymmetric line broadening is investigated in Cu(NO3)(2)center dot 2.5D(2)O, a model material for a one-dimensional bond alternating Heisenberg chain, using the high resolution neutron-resonance spin echo (NRSE) techniqu ...

Amer Physical Soc2016

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

Thomas Keller, 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

Shear resistance of lightweight concrete core of FRP-concrete sandwich structure

Thomas Keller, Till Vallée, Erika Schaumann

This paper presents a model to predict the shear resistance of the unreinforced lightweight concrete core of a recently developed hybrid sandwich concept for bridge decks. The sandwich skins consist of a fiber-reinforced polymer (FRP) composite sheet for t ...

2009

Resistance and ductility of FRP composite hybrid joints

Thomas Keller, Lulu Liu

An experimental investigation of the load-bearing behavior and ductility of FRP hybrid double-lap joints composed of both adhesively-bonded and bolted connection parts was conducted. Amongst other things, the effects of the adherends’ fiber architecture (u ...

2020

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

Influences of polymer concrete surfacing and localised load distribution on behaviour up to failure of an orthotropic FRP bridge deck

Thomas Keller

This paper presents experimental results which demonstrate the important, but to date little-studied influence of surfacing on the response up to failure of orthotropic GFRP bridge decking local to concentrated loading. Four bonded deck specimens were test ...

Elsevier2013

Evaluation of grout materials for CFRP ground anchors with strap ends

Thomas Keller, Anastasios Vassilopoulos, Haifeng Fan

An evaluation of cement- and resin-based grout materials for applications in carbon fiber-reinforced polymer (CFRP) ground anchor heads composed of high-strength grout and a CFRP strap was conducted. Uniaxial compression experiments were performed on cylin ...

Elsevier2017