BS EN 17121:2019
$142.49
Conservation of cultural heritage. Historic timber structures. Guidelines for the on-site assessment of load-bearing timber structures
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 32 |
This document gives guidelines on the criteria to be used for the on-site assessment of load-bearing timber structures in heritage buildings. It is intended for all those concerned with the conservation of heritage buildings which contain wooden elements, from the building owners or authorities who are responsible for them to the professionals employed. It should also help decision-making regarding the need for immediate measures. Its aim is to guarantee that condition survey and assessment provide the necessary data for historical analysis, structural safety assessment and planning of intervention works.
This document is applicable to any kind of timber member and to any kind of historic timber structures. It is not applicable to timber members made of engineered wood based panels and glued laminated timber.
This document provides a comprehensive procedure for the on-site assessment. With a practical and technical evaluation of the damage found and based on the responsibility of the involved professionals, a sufficient assessment can also be made when not all the steps are followed.
In each different country, the document is expected to be applied in accordance with National legislation and regulations.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 10 | 4 Assessment procedure 4.1 General |
| 11 | 4.2 Preliminary assessment 4.2.1 Need for the preliminary assessment |
| 12 | 4.2.2 Principles 4.2.3 Time dependant results |
| 13 | 4.2.4 Preliminary conditions for the survey 4.3 Desk study 4.4 Historical analysis |
| 14 | 4.5 Preliminary visual survey 4.6 Measured survey 4.6.1 General 4.6.2 Geometric survey 4.6.3 Diagnostic survey |
| 15 | 4.7 Structural analysis |
| 16 | 4.8 Preliminary report |
| 17 | 5 Detailed survey 5.1 Overview 5.2 General |
| 18 | 5.3 Identification of wood species 5.4 Estimating wood moisture content and moisture gradients 5.5 Characterization of biological damage 5.5.1 Identification of biological damage 5.5.2 Assessment of effective cross-section |
| 19 | 5.6 Strength assessment of timber 5.6.1 General 5.6.2 Identification of structural member types 5.6.3 On-site visual strength grading of structural timber members |
| 20 | 5.6.4 Strength assessment using non-destructive tests 5.7 Wood dating |
| 21 | 5.8 Detailed survey of timber joints 5.8.1 Assessment of joint characteristics 5.8.2 Detailed geometry |
| 22 | 5.8.3 Alterations 5.8.4 Timber quality and conditions 5.9 Detailed structural analysis |
| 23 | Annex A (informative)Tools for non-destructive analyses on timber structures A.1 Equipment for visual condition survey |
| 24 | A.2 Moisture meters |
| 25 | A.3 Surface hardness gauge |
| 26 | A.4 Penetration resistance A.5 Coring A.6 Resistance drilling |
| 27 | A.7 Borescope A.8 Screw withdrawal strength A.9 Vibration A.10 Propagation time of elastic stress wave |
| 28 | A.11 Radiography and tomography A.12 Proof loading test |
