<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Wood is a significant structural material, which is often used for timber bearing structures. Elements of timber structures must especially satisfy safety requirements, which are expressed by the ultimate limit states in the established standards. The structure must also satisfy the serviceability limit states. Local and global deformations make it impossible for the structure to serve the purpose it was designed for. It is important to take the deflections and their possible increase into account in the design to provide a structure which can be used during the whole period of service. Based on earlier examinations, it is known that a timber element over the course of long-term loading shows creep behavior. The structure of wood is able to adapt to the conditions of the surrounding environment. The properties of wood are especially affected by the relative humidity of the air and then by the type, intensity and duration of the loading. The most important factors affecting the serviceability of timber structures are volume changes caused by humidity and additional deflections caused by the effects of long-term loading. These phenomena emphasize the importance of serviceability limit states for timber structures. The paper deals with a long-term experimental investigation of timber girders that are currently often used. The aim was to obtain the deflection curves and mark the time dependence and the final deflections. The paper will also define the approximations for simulating the time-dependent deflections and obtain the creep coefficients for calculating the final deflections of the girders investigated.</p></abstract>

Wood is a significant structural material, which is often used for timber bearing structures. Elements of timber structures must especially satisfy safety requirements, which are expressed by the ultimate limit states in the established standards. The structure must also satisfy the serviceability limit states. Local and global deformations make it impossible for the structure to serve the purpose it was designed for. It is important to take the deflections and their possible increase into account in the design to provide a structure which can be used during the whole period of service. Based on earlier examinations, it is known that a timber element over the course of long-term loading shows creep behavior. The structure of wood is able to adapt to the conditions of the surrounding environment. The properties of wood are especially affected by the relative humidity of the air and then by the type, intensity and duration of the loading. The most important factors affecting the serviceability of timber structures are volume changes caused by humidity and additional deflections caused by the effects of long-term loading. These phenomena emphasize the importance of serviceability limit states for timber structures. The paper deals with a long-term experimental investigation of timber girders that are currently often used. The aim was to obtain the deflection curves and mark the time dependence and the final deflections. The paper will also define the approximations for simulating the time-dependent deflections and obtain the creep coefficients for calculating the final deflections of the girders investigated.

Timber beams subjected to long - term loading

Department of Steel and Timber Structures, Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, 813 68 Bratislava

Slovak Journal of Civil Engineering

{"article-title":"Timber beams subjected to long - term loading"}

Wood is a significant structural material, which is often used for timber bearing structures. Elements of timber structures must especially satisfy safety...

Timber beams subjected to long - term loading

Published Online: Jun 07, 2011

Page range: 21 - 26

DOI: https://doi.org/10.2478/v10189-010-0013-5

Keywords
Rheology, timber structures, long-term loading, creep, experimental investigation

This content is open access.

Timber beams subjected to long - term loading

Published Online: Jun 07, 2011

Page range: 21 - 26

DOI: https://doi.org/10.2478/v10189-010-0013-5

KeywordsRheology, timber structures, long-term loading, creep, experimental investigation

This content is open access.

Keywords
Rheology, timber structures, long-term loading, creep, experimental investigation