Course code BūvZ4103

Credit points 2

Wooden and Plastic Structures II

Total Hours in Course80

Number of hours for lectures16

Number of hours for seminars and practical classes16

Independent study hours48

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

Knowledge: about timber structures, about definition of design model, assessment of unfavourable loading combination and situation, assessment of whole structure, as well as individual its elements for ultimate and serviceability limit state conditions. Attendance of lectures, examination. • Skills: to define a design model of the timber structure, to perform the static analysis of a structure, and the calculation and design of structural timber elements and joints according limit states method applying Eurocode 5 methodology. The skills are demonstrated by developed independent works and by test. • Competence: ability to do a good choice of timber structure regarding loading and service conditions, as well as to prove its suitability. Examination

Course Content(Calendar)

1 Plane frames in timber. Geometric stability and instability of plane frames. Definition of design model.
2 Choice of bearing structure correspondingly to span being covered, loading conditions, available materiāls and manufactures.
3 Built-up berams with mechanical fasteners.
4 Beam type trusses. Types of trusses. General principles for design of timber trusses.
5 Nailed and bolted trusses and the ones with shear connectors in joints.
6 Trusses with punched metal plates in joints.
7 Large span trusses of glue-laminated timber elements with concealed steel plates and dowel type fasteners in joints (dowels and bolts).
8 Three hinged portal frames of solid sections. Two hinged diagonal frames.
9 Three hinged glue laminated timber arches. Two hinged arches with tie beam.
10 Design of support and apex hinges of arches and portalframes.
11 Design of system stability. Design of bracing system.
12 Moment-resisting connections in timber structures
13 Structural plastics, products, properties and using in structures.
14 Pneumatic structures and tents.
15 Introduction for space structures: lattice barrel vaults, ribbed shells, lattice domes, hyperbolic paraboloid shells, towers
16 Assessment of timber structures correspondingly to the criteria of economic, safety and sustainability considerations.

Requirements for awarding credit points

Examination: two tasks on design af timber elements and connections, and one issue on basic concepts for demonstration of his/her erudition.
Prerequisites:
Passesd credit test of the first part of study course BūvZ3109 “Wooden and Plastic Structures I”
Course Project elaborated and defended: BūvZ4104 “Wooden and Plastic Structures III”

Description of the organization and tasks of students’ independent work

1st independent work. Developing of design model of cross frame structre of a building and calculation of internal forces produced from loads (permanent, variable) using FEM based programm: Axis VM or RFEM Design. Results of load combinations by Excel. 2nd independent work. Calculations of timber beams by designing Excel worksheet 3rd independent work. Design of support joints of timber beams: calculation of bearing capacity of fasteners by Excel means and drafting by AutoCAD or Revit. Test. Design of support joint of truss

Criteria for Evaluating Learning Outcomes

1st independent work will be accepted if student presents tables of internal forces, which corresponds to loads attached; 2nd independent work will be accepted if student presents Excel worksheet for calculation of timber beams and dimensions of cross section corresponds to limit state conditions; 3rd independent work will be accepted if student presents the detail design of support joint of floor beam to primary beam. During discussion with course leader the student demonstrates his/her competence in details of work proving that it is not plagiarism. It is sufficiently to present independent works in digital mode. Test will be enrolled, if the student presents rational solution of support joint of truss correspondingly to forces to be transferred. Examination enables to strengthen a knowledge acquired, to confirm the skills and competence developed. Executing the first task the student testifies his/her ability to perform the simplified calculation procedures of timber elements using limit state method. Executing the second task the student testifies his/her ability to select an appropriate type of fasteners for joining the timber elements in node. The third one is topic from theory regarding basic terms and relationships in timber engineering.

Compulsory reading

1. Timber Engineering. Edited by S. Thelandersson, H. J. Larsen. Chichester etc.: John Wiley & Son, 2003. 446 p. 2. Ozola L. Koka būvkonstrukciju aplēse un konstruēšana II: 1. un 5. Eirokodeksa pielietošana būvprojektēšanā. Jelgava, LLU, 2011. 208 p. 3. Larsen H., Enjily V. Practical design of timber structures to Eurocode 5. London: Thomas Telford, 2009. 268 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. Manual for the design of timber building structures to Eurocode 5. The Institution of Structural Engineers, TRADA. London: Institution of Structural Engineers, 2007. 258 p. + 1 CD 3. Göggel M. Bemessung im Holzbau. Karlsruhe: Bruderverlag, 2000. 2 CD-ROM. 3. Timber Frame Construction. Revised by H. Twist and R. Lancashire; edited by B. Keyworth. 4th ed. High Wycombe: TRADA, 2008. 263 p.

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”