Evaluation of a design approach to the on-site structural repair of decayed old timber end beams

Pizzo, Benedetto; Gavioli, Mariangela; Lauriola, Marco

doi:10.1016/j.engstruct.2012.09.036

Cited by 17 publications

(15 citation statements)

References 10 publications

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Section: Use Of Stainless Steel Rodsmentioning

confidence: 99%

“…The rods are typically made of fiberglass, carbon FRP or stainless steel (Figures 14 and 15). Pouring or injection resins are used to fix the rods into the prostheses and the pre-existing beam [45][46][47][48]. From a practical viewpoint, these are difficult repairs to carry out on site, requiring overhead cutting of the slot by multiple drillings or chain-morticer/chain-saw cutting.…”

Section: Use Of Stainless Steel Rodsmentioning

confidence: 99%

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Repair and Reinforcement of Historic Timber Structures with Stainless Steel—A Review

Corradi

Osofero

Borri

2019

Metals

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Recent trends in the use of stainless steel profiles for repair and reinforcement of historic timber structures, after degradation due to biotic and non-biotic attacks, are discussed in this paper. These structural challenges can vary from inadequate load carrying capacity to complexities involved with choice of repair materials and techniques. Given the recurring requirements of conservation authorities in terms of reversibility of interventions and compatibility between historic and new materials, an increase in the use of non-invasive reinforcement materials and reversible techniques was observed. Subsequently, engineers and researchers have increasingly employed stainless steel alloys in retrofitting historic timber structures. This paper therefore presents the state of the art in the use of stainless steel profiles in retrofitting timber structural elements within historic structures. It includes a review of the development of the retrofitting methods and existing experimental studies on the mechanical behavior of timber structures reinforced with stainless steel. Finally, it presents a number of case studies and draws conclusions on current trends and practices based on reported studies.

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Section: Use Of Stainless Steel Rodsmentioning

confidence: 99%

Section: Use Of Stainless Steel Rodsmentioning

confidence: 99%

Repair and Reinforcement of Historic Timber Structures with Stainless Steel—A Review

Corradi

Osofero

Borri

2019

Metals

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“…Studies [1][2][3] have used steel plates and FRPs (fibre-reinforced polymers) as reinforcement to repair damaged timber members. However, both reinforcement methods require a large amount of work and involve complex installation procedures.…”

Section: Introductionmentioning

confidence: 99%

Screw reinforcement on dowel-type moment-resisting connections with cracks

Zhang

Guo

Jung³

et al. 2019

Construction and Building Materials

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This study uses partially threaded self-tapping screws to enhance the mechanical properties of damaged and undamaged dowel-type timber connections. The damaged connections have a 1.5mm wide artificial crack across the middle row of the fasteners. Test results showed that screw reinforcement can restore the rotation capacity of damaged connections. The rotational capacity of reinforced connections without cracks is 45.6% higher than unreinforced connections while the improvement on moment-resisting capacity is slight. Digital image correlation (DIC) was used to detect the movement of the connections and validated that the fasteners rotate around the centre of rotation in reinforced connections. Screw reinforcement also demonstrated the ability to control crack propagation, with the reinforced groups showed a reduction of crack length by at least 37% when compared to the unreinforced groups. A calculation method is proposed to calculate the characteristic moment-resisting capacity of damaged and undamaged screw reinforced connections. The calculated values are proven to be conservative when compared with the characteristic value based on the experimental results. Highlights  Self-tapping screws restored the rotational capacity of connections with cracks  Partially threaded screws showed a trend to effectively control crack propagation  A theoretical prediction method is demonstrated

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“…Thus, in work [3], timber beam structures are restored by using the glued rods, in article [4], for multilayer glued beams with lamination, self-tapping screws with plywood sheets are used and it is proved that the greatest effect is achieved by the preventive repair. In studies [5], wooden ceilings are restored with glued steel sheets. In some cases, steel frame prostheses [6,7] are used for long-term operated constructions.…”

Section: Introductionmentioning

confidence: 99%

Cost minimization for safety enhancing of timber beam structures in historical buildings

2019

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A search method for finding rational parameters of beam structure bearing capacity recovery systems has been developed. This task is relevant to historic buildings containing girders with structural damage. The solution search technique is implemented by the example of calculating the parameters for timber beams external bearing capacity restoration systems with local damage or destruction of supports. An adapted genetic algorithm is used as a tool to solving the problem. A feature of this algorithm is the use of an improved random change operator and the formation of an initial and subsequent solutions sets. In this case, classical evolutionary modelling operators are not used, and the preservation of solutions from iteration to iteration is performed based on modification of the well-known elitism principle. Such computational process has allowed increasing the convergence of the iterative optimization significantly for the tasks considered. Ensuring the structure safety is achieved by strength conditions and regulating the system deflection while minimizing the costs for its operation. Herewith, the objective function allows taking into account both the lump-sum costs for system restoration arrangement and the costs for maintaining its operation during the operation cycle. An example of restoring the beam bearing capacity with the loss of stiffness of its supporting and middle span sections has been considered.

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Evaluation of a design approach to the on-site structural repair of decayed old timber end beams

Cited by 17 publications

References 10 publications

Repair and Reinforcement of Historic Timber Structures with Stainless Steel—A Review

Repair and Reinforcement of Historic Timber Structures with Stainless Steel—A Review

Screw reinforcement on dowel-type moment-resisting connections with cracks

Cost minimization for safety enhancing of timber beam structures in historical buildings

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