Inhaltszusammenfassung

Rehabilitation and strengthening of timber structures request efficient techniques and smart materials with a high load-bearing capacity. To obtain the benefits of these, an efficient connection between the structure and the reinforcing material is necessary. One solution is adhesive mounting to obtain an almost stiff bond line between the different components. Recent investigations indicate Fiber-Reinforced Plastics (FRP) and Epoxy-Polymer Concrete (PC) can be effectively used to improve str...Rehabilitation and strengthening of timber structures request efficient techniques and smart materials with a high load-bearing capacity. To obtain the benefits of these, an efficient connection between the structure and the reinforcing material is necessary. One solution is adhesive mounting to obtain an almost stiff bond line between the different components. Recent investigations indicate Fiber-Reinforced Plastics (FRP) and Epoxy-Polymer Concrete (PC) can be effectively used to improve strength and stiffness of timber beams in different configurations and techniques to utilize the reinforcing material efficiently and to ensure long service life of the selected system. In this paper FRP has been used near surface mounted (NSM) by reinforcing the timber bearing systems for higher tension and shear resistance, similar to concrete structures. This method is relatively simple and considerably enhances the bond of the mounted FRP reinforcements. A high compression proof epoxy concrete was used in combination with NSM to strengthen the compression zone. Both techniques are suitable for on-site application because they are easy to transport and to mount. All composite partners have been revised according to the material formulation, structural performance of the composites, fracture and delamination behavior. Appropriate mechanical models for the numerical simulation based on a finite element approach are presented. The main advantage is the highly improved structural performance with only low interventions in specific areas, as well as low self-weight of the thin reinforcement layers. This paper presents different aspects for on-site use where first examples in reconstruction and strengthening of timber structures using this system are done. Furthermore, a numerical and theoretical model is presented. The used mechanical model shows good agreement with recent test results and addresses structural nonlinearities and FRP debonding. For static analyses, the described adhesive bonding system can set with direct and rigid connection between timber and reinforcement material. The proposed application can be recommended for application in historic buildings even if the expense of the materials themselves are quite high. In fact, the expense of the whole procedure often is lower, compared to traditional reconstruction systems. » weiterlesen» einklappen

Autoren

Klassifikation

DFG Fachgebiet:
Bauwesen und Architektur

DDC Sachgruppe:
Ingenieurwissenschaften