Course code BūvZ4104

Credit points 2

Wooden and Plastic Structures III

Total Hours in Course32

Independent study hours32

Date of course confirmation17.02.2015

Responsible UnitDepartment of Structural Engineering

Course developer

author Būvkonstrukciju katedra

Lilita Ozola

Dr. sc. ing.

Prior knowledge

BūvZ2007, Building Materials I

BūvZ2040, Structural Analysis I

BūvZ3078, Structural Analysis II

BūvZ3093, Actions on Building Structures

Course abstract

The basic knowledge is acquired on strength and stiffness properties, factors affecting of wood and structural plastic materials. Behaviour of structural elements under loads is studied applying limit state method concept. Determination of bearing capacity of connections is acquired including principles of design and experimental tests. General types and rational solutions of wooden and plastic structures are examined. Course project enables for mastering skills in design- some plane frame timber structure (beams, columns, trusses, arches) has been worked out according Eurocode principles. BIM system software is utilized for execution of course project: Axis VM (or Dlubal RFEM) and AutoCAD, as well as MS Excel tools.

Learning outcomes and their assessment

Elaboration of design project of timber structures enables for exploring and development of essential skills needed for future civil engineer, i.e., an application of the theoretical principles to the analysis and design of timber structures, ability to do a good choice for fastener type in joints regarding shear forces to be transferred, and to acquire some experience in design work passing majority of "how to do" questions self-dependently or using advices. The expected competencies deal with consistent assessment of design data and preconditions for use of timber structures in building as well as to prove his/her project carried out perfectly. Assessment: project verification and defence.

Course plan

1 Data analysis for design order. Choice with arguments for adequate design model of global bearing system and individual elements.
2 Determination of loads and static analysis of system under individual load types (permanent, variable) according LVS EN 1990 and Eurocode 1.
3 Determination of internal forces under fundamental load combinations and loading situations. Manifestation of unfavourable loading for elements and joints.
4 Design of intermediate floor joists and girders
5 Choice of structural solution for roof structure corresponding to span to be covered and forces to be transferred.
6 Calculation of structural elements for limit states conditions according Eurocode 5.
7 Capacity calculation of mechanical fasteners.
8 Design of the main connections in structure and overall checking of bearing capacity
9 Design of stiff support connection of column.
10 Overall stability of system. Design of bracings.
11 Analytical testing of corrected design model of system (taking into account eccentricities in joints)
12 Elaboration of technical drafts
13 Elaboration of detail drafts for some joints or timber products
14 Calculation of material consumption, assessment of design from technical and economic point-of-view
15 Specifications for manufacturing of structures, for transportation and erection, as well as for ensurance of normal service conditions

16 Comparison of design variant with some typical one for the same span and loading parameters.

Requirements for awarding credit points

Design project will be assessed according to results of check for major errors as well as the discussion on design topics is an important indice for assessment.

Description of the organization and tasks of students’ independent work

Course Project. Topic: Design of timber structures (floor and roof). The student compiles a calendar plan what is accepted by course leader. Process of Project execution is controlled acording calendar plan.

Criteria for Evaluating Learning Outcomes

The assessment of Course project is given according to the following criteria:
1) Result of project verification (content and formatting of report and drawings; adequacy of section sizes of structural elements, as well as joint solutions when one checks external loads attached ). If content of Project does not fulfill requirements or structural solution presented leads to collapse, the Project will be returned for correction and/or improvements.
2) Result of defence (ability to characterise behaviour of both structural elements and mechanical fasteners under load, to explain calculation conditions and specify data sources (codes), to prove the structural solution chosen). When defence is failed it is not possible to gain a positive mark of course Project even in the case of excellent result in project verification. In this case a new deadline for course Project defence is specified. Three events of failed defence lead to a new task .
The student will have an outstanding assessment grade of his/her project if it is elaborated perfect and/or contains an original solution proved in excellent discussion.
In general case student will have an positive grade of his/her design if structure may be assessed as safe enough according limit state conditions, as well as student is able to explain and prove solutions. The main feature to be assessed is understanding of structural solutions presented.

Compulsory reading

1. Ozola L. Koka būvkonstrukciju aplēse un konstruēšana II: 1. un 5. Eirokodeksa pielietošana būvprojektēšanā. Jelgava; LLU, 2011. 208 lpp. 3. Ozola L. Koka būvkonstrukciju aplēse un konstruēšana I. Jelgava: LLU, 2008. 259 lpp. 4. Porteous J., Kermani A. Structural timber design to Eurocode 5. Chichester, West Sussex, UK: John Wiley & Sons Inc., 2013. 624 p.

Further reading

1. Porteous J., Ross P. Designers' Guide to Eurocode 5: design of timber buildings: EN 1995-1-1. London: ICE, 2013. 209 p. 2. Rug W., Mönck W. Holzbau: Bemessung und Konstruktion. Berlin: Beuth, 2015. 794 S. 3. Mandy P., Scheer C. Holzbau-Taschenbuch: Bemessungsbeispiele nach Eurocode 5. Berlin: Ernst & Sohn, 2015. 344 S.

Periodicals and other sources

1. Bauen mit Holz. ISSN: 0005-6545 2. The Structural Engineer. London: The institution of structural engineers. ISSN 1466-5123 3. Būvinženieris: Latvijas Būvinženieru savienības izdevums. Rīga: Latvijas Būvinženieru savienība. ISSN 1691-9262.

Notes

Compulsory Course for the Professional Bachelor’s study programme “Civil Engineering” and for the Second level professional higher educational programme “Civil Engineering”