Abstract Fiber-reinforced polymer (FRP) structures, due to their low mass, are valuable alternatives to traditional steel or concrete structures in seismic areas. However, to resist seismic actions, FRP structures must be able to dissipate a significant amount of inelastic energy. Since FRP materials are brittle, this dissipation must occur in the joints. Monotonic tension and cyclic tension-compression experiments were thus performed on adhesive and bolted double-lap joints composed of pultruded glass fiber-reinforced polymer (GFRP) profiles; a flexible adhesive was used in the adhesive joints. A significant amount of energy was dissipated in the adhesive joints at lower and medium displacement rates through viscoelastic friction and damage in the adhesive, while almost no energy dissipation occurred at the highest rate. The energy in the bolted joints was dissipated by progressive crushing and shear-out failures in the inner laminates. Although the dimensions and monotonic strength of the adhesive and the bolted joints were similar, the former dissipated significantly more energy at the two lower applied displacement rates. The obtained results can contribute to the seismic design of inelastic joints in FRP structures.
Abstract This study investigates the cyclic performance of splice connections developed for hollow section fibre reinforced polymer (FRP) members. Splice connection specimens, each consisting of a steel bolted flange joint between two hollow section steel-FRP bonded sleeve joints, are prepared in three configurations with difference in bolt arrangement or bond length. Correspondingly, detailed finite element (FE) models are constructed with consideration of yielding of the steels, damage in the ...
Last. Meta Kržan(University of Ljubljana)H-Index: 5
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Abstract Innovative hybrid structural components composed of cross-laminated timber frame and laminated glass infill were tested to examine their response on the reverse-cyclic loading. Ductile timber-frame joints with glued-in steel rods and especially designed glass-to-timber contacts with no adhesive proved to provide high ductility and energy dissipation of structural components. In total, 20 tests of full-scale specimens were carried out; three bare frames, six frames with single glazing an...
#1David Martins(IST: Instituto Superior Técnico)H-Index: 3
#2M. Proença(IST: Instituto Superior Técnico)H-Index: 3
Last. Nuno Silvestre(IST: Instituto Superior Técnico)H-Index: 44
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Abstract Pultruded glass fibre reinforced polymer (GFRP) profiles have low weight, high strength and corrosion resistance, but their brittle failure raises concerns about their use in seismic regions. Moreover, although their static monotonic response is reasonably well understood, the cyclic and hysteretic behaviour of GFRP frame structures and their beam-to-column connections have not yet been comprehensively investigated. This paper presents experimental and numerical investigations on the cy...
Typical cold-formed steel (CFS) moment-resisting connections generally have relatively low ductility and energy dissipation capacity as a result of low local/distortional buckling resistance of thin-walled CFS elements, and therefore, may not be suitable for seismic applications. To address this issue, a comprehensive analytical study is presented on the seismic performance of CFS bolted beam-to-column connections with fiction-slip mechanism aiming to obtain more efficient design solutions suita...
Abstract Steel storage pallet racks are slender structures sensitive to the second-order effects. Therefore, the stability and seismic response of unbraced pallet racks are greatly influenced by the behaviour of the connections between pallet beams and uprights. In recent applications, a bolt has been installed in the otherwise boltless connections broadly used in pallet racks, in order to improve the behaviour of the connections and the stability of the overall structure. In this paper, an expe...
Last. Thomas Keller(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
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Abstract In the field of timber load-bearing structures, adhesive bonding is a promising joining technique that may increase the structural stiffness and capacity of timber joints and structures. The use of ductile adhesives may furthermore allow designing ductile joints, which can compensate for the material ductility that timber lacks. To demonstrate the potential of this approach, adhesively-bonded double-lap timber joints were manufactured using a ductile acrylic adhesive and then subjected ...
Last. Lei Zhu(Beijing University of Civil Engineering and Architecture)H-Index: 12
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Abstract This paper presents an investigation on the cyclic performance of bonded sleeve connections for joining tubular FRP beams and columns. Specimens with different endplate thickness and number of bolts are examined under cyclic loading. The hysteretic moment-rotation responses of specimens, including rotational stiffness, ultimate moment and rotation capacity, and local strain responses are experimentally obtained and comparatively investigated. The cyclic performance of specimens is also ...
Abstract Glued-in rod connections for timber beams are increasingly being used, as they offer high strength and stiffness and a better appearance in comparison with traditional mechanical connections. First, a campaign of experimental tests on glued-in threaded steel rod joints subjected to monotonic bending moments was carried out, checking the effect of a confining system for the bars (transversal screws) and the different arrangement of the rods, or varying the mechanical characteristics of t...
Last. Yu Bai(Monash University, Clayton campus)H-Index: 69
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This paper presents a comparative study on the energy dissipation capacity of one glass fibre-reinforced polymer frame with bonded sleeve connection and steel frames with bolted endplate connections. Experimentally measured moment-rotation behaviour of a typical bonded sleeve connection was employed to develop the joint model for the glass fibre-reinforced polymer frame. In order to reduce the effect of the different beam size on the overall frame behaviour, the size of the steel profiles was se...
#1Sonia Yanes-Armas(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Julia de Castro(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 15
Last. Thomas Keller(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
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Abstract 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 moment directions each, was characterized. An experimental procedure based on three-point bending and cantilever experiments conducted on the web elements and simple analytical models was used. The WFJs generally exhibited non-rigid and...
Last. Thomas Keller(EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 45
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Abstract The tension-tension fatigue behavior of ductile adhesively-bonded double-lap FRP joints was experimentally investigated. An acrylic adhesive, which was in the rubbery state at ambient temperature, provided the joint ductility. The fatigue degradation of the joints was characterized by the cyclic energy dissipation, cyclic stiffness, cyclic creep displacement and self-generated temperature. The effects of elevated temperature on the joints’ static tensile and pure creep behaviors were al...
Abstract 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 (uni- or multidirectional), adhesive type (stiff or flexible), and displacement rate were examined. The resistances of the hybrid joints with flexible adhesive corresponded to the full summation of the resistances of the bonded and bolte...