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Thomas Keller

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Related publications (309)

Stiffness degradation and life prediction of adhesively- bonded joints for FRP composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

2008

Comparison of genetic programming with conventional methods for fatigue life modeling of FRP composite materials

Thomas Keller, Anastasios Vassilopoulos

Genetic programming is used in this paper for modeling the fatigue life of several fiber-reinforced composite material systems. It is shown that if the genetic programming tool is adequately trained, it can produce theoretical predictions that compare favo ...

2008

Stiffness degradation and life prediction of adhesively- bonded joints for fiber-reinforced polymer composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

Adhesively-bonded joints, including double- and stepped- lap joints (DLJs and SLJs), were experimentally investigated under cyclic tensile loading. The joints were composed of pultruded GFRP laminates and epoxy adhesive. A critical stiffness was found for ...

2008

Progressive failure process of adhesively bonded joints composed of pultruded GFRP

Thomas Keller, Ye Zhang

Adhesively bonded joints are being used increasingly in civil engineering structures, especially for joints comprising pultruded glass fiber reinforced polymer (GFRP) laminates. The layered material architecture, however, leads to a complex delamination fa ...

2008

Fatigue failure of adhesively-bonded structural joints for FRP composites

Thomas Keller, Ye Zhang, Anastasios Vassilopoulos

2008

Ductile double-lap joints from brittle GFRP laminates and ductile adhesives. Part I: Experimental investigation

Julia De Castro San Roman Fest, Thomas Keller

Quasi-static axial tension experiments were performed in a laboratory environment on adhesively-bonded double-lap joints from pultruded GFRP laminates. Full-scale specimens were investigated to prevent size effects. Ductile polyurethane and acrylic as well ...

2008

Function-integrated GFRP sandwich roof structure

Thomas Keller

2008

Modal parameter identification for a GFRP pedestrian bridge

Thomas Keller, Yu Bai

Dynamic experiments were conducted on an all-FRP composite pedestrian bridge. The structure was excited by impact and human-induced vibrations. The peak-picking method and stochastic subspace identification method were used to extract structural dynamic ch ...

2008

Structural concept, design and experimental verification of a GFRP sandwich roof structure

Thomas Keller, Till Vallée

This paper reports on the design and construction of a lightweight glass fiber-reinforced polymer roof structure in Basel, Switzerland. The sandwich construction allowed for an integration of static, building physical and architectural functions that enabl ...

2008

Direct loading experiments on hybrid-FRP lightweight concrete sandwich bridge decks

Thomas Keller, Till Vallée, Erika Schaumann

2008

Modeling of stiffness properties of FRP composites under elevated and high temperatures

Thomas Keller, Till Vallée, Yu Bai

When subjected to elevated and high temperatures, the mechanical properties of FRP composites, such as the E- modulus and viscosity, experience significant changes. At a certain temperature, a composite material can be considered a mixture of materials tha ...

2008

Multifunctional fiber-reinforced polymer sandwich roof structure

Thomas Keller

This paper reports on the design and construction of a lightweight GFRP roof structure in Basel, Switzerland. The sandwich construction allowed for an integration of static, building physical and architectural functions that enabled the prefabrication of t ...

2008

Modeling of thermal responses for FRP composites under elevated and high temperatures

Thomas Keller, Till Vallée, Yu Bai

Based on temperature-dependent thermo-physical property models developed previously, a one-dimensional model was proposed to predict the thermal responses of FRP composites in time and space domain, up to high temperatures. An implicit finite differential ...

2008

Function-integrated GFRP sandwich roof structure – Experimental validation of design

Thomas Keller, Till Vallée

2008

Function-integrated GFRP sandwich roof structure – Structural concept and design

Thomas Keller

2008

Ductile double-lap joints from brittle GFRP laminates and ductile adhesives. Part II: Numerical investigation and joint strength prediction

Julia De Castro San Roman Fest, Thomas Keller

Joint analysis using a non-linear finite element model has been performed to analyze the effects of adhesive ductility on the stiffness and strength of full-scale adhesively-bonded double-lap joints composed of brittle pultruded GFRP laminates. Experimenta ...

2008

Dynamic behavior of an all-FRP pedestrian bridge

Thomas Keller, Till Vallée, Yu Bai

2007

Bridge deck from FRP-composites and ligtweight and high performance concrete

Thomas Keller, Till Vallée, Erika Schaumann

2007

Flexural behavior of a hybrid FRP and lightweight concrete sandwich bridge deck

Thomas Keller, Till Vallée, Erika Schaumann

This paper presents a new concept for a lightweight hybrid- FRP bridge deck. The sandwich construction consists of three layers: a fiber-reinforced polymer composite (FRP) sheet with T-upstands for the tensile skin, lightweight concrete (LC) for the core a ...

2007

Long-term compression performance of a pultruded GFRP element exposed to concrete pore water solution

Thomas Keller, Florian Riebel

A durability study was performed on a pultruded glass fiber reinforced polymer (GFRP) compression element of a hybrid GFRP/steel joint for concrete structures. GFRP elements were immersed in alkaline pore water solutions of different temperatures during 18 ...

2007

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