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Related publications (309)

Shear wrinkling of GFRP webs in cell-core sanwiches

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

Glass fiber-reinforced (GFRP) cell-core sandwich structures are increasingly used in bridge deck and roof construction. GFRP cell-core sandwiches are composed of the outer GFRP face sheets, a foam core and a grid of GFRP webs integrated into the core in or ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2010

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

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

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

Mode I an II fracture behavior of adhesively-bonded pultruded composite joints

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The Mode I and II fracture behaviors of adhesively-bonded joints composed of pultruded glass fiber-reinforced polymer (GFRP) laminates were experimentally investigated using Double-Cantilever-Beam (DCB) and End-Loaded-Split (ELS) specimens. The large speci ...

Elsevier2010

Fire protection systems for building floors made of pultruded GFRP profiles. Part 1: Experimental investigations

Thomas Keller, Yu Bai

This paper presents results of experimental investigations on the behaviour of GFRP pultruded profiles exposed to fire, in order to study the viability of their structural use in floors of buildings, taking into account the fulfilment of fire resistance re ...

Elsevier2010

Polymer concrete-GRP plate hybrid joints for transverse moment-shear continuity in GRP bridge decks

Thomas Keller, Wendel Michael Sebastian

This paper describes an experimental study of two joint configurations, one with only reinforced polymer concrete (RPC) infill, the other with RPC infill and bonded GRP plates, to overcome shear and moment discontinuities in GRP bridge decks transverse to ...

Elsevier2010

PNL constant life diagram formulation for FRP composites materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

2010

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

Piecewise non-linear constant life diagram formulation for FRP composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

A new formulation for predicting an asymmetric, piecewise non-linear constant life diagram (CLD) is introduced in this paper. The development of the new model is based on the representation of the fatigue data on the stress ratio (R)-stress amplitude (σa) ...

Elsevier2010

Fire protection systems for building floors made of pultruded GFRP profiles. Part 2: Modeling of thermomechanical responses

Thomas Keller, Yu Bai

A recently developed thermomechanical model to predict the time-dependent thermal and mechanical responses of pultruded glass fiber-reinforced polymer (GFRP) profiles subjected to fire was extended to include the beneficial effects of passive fire protecti ...

Elsevier2010

Fracture of adhesively-bonded pultruded GFRP joints under constant amplitude fatigue loading

Thomas Keller, Anastasios Vassilopoulos, Yi Zhang

The fracture behavior of adhesively-bonded structural joints under tensile constant amplitude fatigue has been investigated. Double-lap joints (DLJs) and stepped-lap joints (SLJs) composed of pultruded GFRP laminates and an epoxy adhesive were examined. Bo ...

Elsevier2010

Fire endurance performance of cellular GFRP columns with water-cooling system

Thomas Keller, Yu Bai, Christian Ludwig

Experimental results on the fire endurance of full-scale glass fiber-reinforced polymer (GFRP) composite columns are reported in this paper. The pultruded four-cell profiles were first loaded to axial compression (uniform serviceability stress of 5 MPa) an ...

DEStech Publications Inc.2010

Design of robust and ductile FRP structures incorporating ductile adhesive joints

Julia De Castro San Roman Fest, Thomas Keller

A design concept for engineering structures consisting of brittle FRP components and ductile adhesive joints is proposed. The elastoplastic adhesive joints provide system ductility that compensates for the material ductility that FRP composites lack. In th ...

2010

Pultruded GFRP tubes with liquid cooling system under combined temperature and compressive loading

Thomas Keller, Yu Bai

An active fire protection system, liquid-cooling, was applied to pultruded GFRP tubes subjected to combined thermal and mechanical loading in order to maintain material temperature below the critical glass transition temperature. The use of an appropriate ...

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

Optimum thickness of joints made of pultruded GFRP adherends and polyurethane adhesive

Thomas Keller, Till Vallée

This paper presents results of experimental and numerical investigations on double-lap joints composed of pultruded GFRP profiles and polyurethane adhesive subjected to quasi-static axial tensile loading. The objective was to investigate the effect of the ...

2009

Modeling of through-thickness stress state in adhesive joints connecting pultruded FRP bridge decks and steel girders

Thomas Keller, Martin Schollmayer

The through-thickness performance of adhesive joints connecting pultruded FRP bridge decks and steel girders subjected to loading in the transverse bridge direction was investigated. Deck-to-girder adhesive joints can be assumed as being loaded by uplift f ...

2009

Delamination of pultruded glass fiber-reinforced polymer composites subjected to axial compression

Thomas Keller, Till Vallée, Yu Bai

Axial compression experiments were conducted on pultruded E-glass fiber-reinforced polymer laminates of different slenderness. Second-order deformations greatly increased the bending moments and shear forces of slender specimens. Delamination failure occur ...

2009

Modeling of strength degradation for fiber-reinforced polymer composites in fire

Thomas Keller, Yu Bai

A model for predicting composite material strength degradation under elevated and high temperatures is proposed. This model is based on the morphology of the mixture of materials in different states. The degradation of resin-dominated shear strength can be ...

2009

Adhesively bonded joints composed of pultruded adherends: considerations at the upper tail of material strength statistical distribution

Thomas Keller, Till Vallée

The Weibull distribution, used to describe the scaling of strength of materials, has been verified on a wide range of materials and geometries; however, the quality of the fitting tended to be less good towards the upper tail. Based on a previously develop ...

2009

A computational tool for the fatigue life prediction of composite materials

Thomas Keller, Behzad Dehghan Manshadi, Anastasios Vassilopoulos

2009

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