文档介绍：2nd Int. PhD Symposium in Civil Engineering 1998 Budapest
CARBON FIBER REINFORCED AND PRESTRESSED TIMBER
BEAMS
Wilhelm Luggin1 and Konrad Bergmeister2,
University of Applied Sciences, Institute of Structural Engineering
A-1190 Vienna
SUMMARY
This research objectives the shear strength of carbon fiber reinforcement bonded into
longitudinal openings of wood. Analysing the differential equation for sliding bond the stiffness
of the bonded CFRP-sheet can be determinated.
Keywords: timber, carbon fiber reinforced plastic, epoxy adhesive, shear strength, k-value
1. INTRODUCTION
Naturally occurring fiber-posites like wood have been used for a long time.
Wood differs from other construction materials because it is produced in a living tree. The
mechanical properties (strength and stiffness) of the biological material wood differ very and
depend on the quality of the tree, the humidity etc. It is necessary to grade the sawn lumber in
different classes. In Austria exists visual and mechanical stress graded timber. There are three
classes for visual graded timber (S 7, S 10, S 13) and four classes for mechanical stress graded
timber (MS 7, MS 10, MS 13, MS 17). For glued-laminated timber beams (glulam-beams) four
types are classified: BS 11, BS 14, BS 16 and BS 18. The beams consist of one class of
lamination or binated of different classes of laminations. binated glul