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Thomas Keller

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Publications associées (309)

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

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

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

Creep of Sandwich Panels with Longitudinal Reinforcement Ribs for Civil Engineering Applications: Experiments and Composite Creep Modeling

Thomas Keller, Mário Alexandre De Jesus Garrido

Composite sandwich panels with reinforcement ribs or webs are being increasingly considered for structural applications in civil engineering. Such panels are prone to creep when subjected to significant permanent loads and therefore the effects of this phe ...

American Society of Civil Engineers2017

Pull-Out Behavior of CFRP Single-Strap Ground Anchors

Thomas Keller, Anastasios Vassilopoulos, Haifeng Fan

Pull-out experiments were performed on four carbon fiber-reinforced polymer (CFRP) ground anchors simulating their applications in rock and soil. The CFRP tendons used in these anchors comprise a single-strap end on both ground and air sides. On the ground ...

American Society of Civil Engineers2017

Pull-out behavior of CFRP ground anchors with two-strap ends

Thomas Keller, Anastasios Vassilopoulos, Haifeng Fan

Pull-out experiments were performed on three carbon fiber-reinforced polymer (CFRP) ground anchors simulating their applications in different rock types which provided different confinement levels. The CFRP tendons comprised, on the ground side, a prefabri ...

2017

Mixed mode fracture properties of GFRP-adhesive interfaces based on video gauge and acoustic emission measurements from specimens with adherend fibres normal to the interfaces

Thomas Keller, Wei Sun, Wendel Michael Sebastian

Mixed-mode bending tests were performed on fifty-three GFRP-adhesive-GFRP specimens. In each specimen the pre-crack was located near the GFRP adherend with fibres normal to the GFRP-adhesive interface, so as to encourage crack propagation along this interf ...

Elsevier2017

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

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

The physical and mechanical properties of a cold-curing structural epoxy adhesive, exposed to a wet bridge environment, were investigated. A significant decrease of the glass transition temperature, tensile E-modulus and tensile strength was observed which ...

Elsevier2017

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

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

The physical and mechanical properties of a cold-curing structural epoxy adhesive, exposed to a representative wet bridge environment, were investigated. A significant decrease of the glass transition temperature, tensile E-modulus and tensile strength was ...

2017

Fracture mechanics-based progressive damage modelling of adhesively bonded fibre-reinforced polymer joints

Thomas Keller, Anastasios Vassilopoulos, Roohollah Sarfaraz Khabbaz, Moslem Shahverdi, Aida Cameselle Molares

A quasi-static progressive damage model for prediction of the fracture behaviour and strength of adhesively bonded fibre-reinforced polymer joints is introduced in this paper. The model is based on the development of a mixed-mode failure criterion as a fun ...

Wiley2017

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

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

Julia De Castro San Roman Fest, Thomas Keller, Andreas Schueler, 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

Post-tensioned CFRP strap elements for civil engineering applications

Thomas Keller

Two applications of post-tensioned CFRP strap elements recently developed at the Composite Construction Laboratory (CCLab) of the Swiss Federal Institute of Technology Lausanne (EPFL) are presented. The first application concerns post-tensioned non-laminat ...

2017

Displacement rate and structural effects on Poisson ratio of a ductile structural adhesive in tension and compression

Thomas Keller, Anastasios Vassilopoulos, Myrsini Angelidi

The effects of the loading type, i.e. tension or compression, and displacement rate on the Poisson ratio of a non-linear viscoelastic ductile structural adhesive have been investigated using digital image correlation-based strain fields. The results showed ...

Elsevier2017

Effects of aging in dry environment on physical and mechanical properties of a cold-curing structural epoxy adhesive for bridge construction

Thomas Keller, Anastasios Vassilopoulos, Maria Savvilotidou

Elsevier2017

Two-dimensional analytical stress distribution model for unbalanced FRP composite single-lap joints

Thomas Keller, Anastasios Vassilopoulos, Zhengwen Jiang

A two-dimensional analytical stress distribution model taking into account the effects of large deformation, bending-tension coupling and interfacial compliance on the quasi-static behavior of unbalanced FRP composite single-lap joints (SLJs) under tension ...

Elsevier2017

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

Ductility, recovery and strain rate dependency of an acrylic structural adhesive

Thomas Keller, Anastasios Vassilopoulos, Myrsini Angelidi

The ductility and time-dependent recovery of a ductile acrylic adhesive were investigated in this work. The quasi-static true tensile and compressive strain behaviors were examined at different strain rates, taking large deformations into account. Yield st ...

Elsevier2017

Long-term design of FRP-PUR web-core sandwich structures in building construction

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

The structural behavior of GFRP-polyurethane (PUR) web-core sandwich structures subjected to sustained loading was investigated. As a basis, a study of the mechanical behavior of rigid PUR foams used as core materials was conducted, with emphasis on creep. ...

Elsevier2017

Rotational stiffness of web-flange junctions of pultruded GFRP decks

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

The rotational behavior of the web-flange junctions (WFJs) of a pultruded glass fiber-reinforced polymer (GFRP) bridge deck system with trapezoidal cell cross-sectional geometry was investigated. The rotational response of three WFJ types, in two bending m ...

Elsevier2017

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