Design of timber structures

Description

structures Volume 3 Design of timber structures Volume 1 Preface Design of timber structures - Volume 3 Contents Design in the ultimate limit state (ULS) 5 Design of timber joints 20 Composite timber elements 32 Horizontal stabilization 39 Design for serviceability 44 Design in the ultimate limit state (ULS) Example 3.1: Design of a straight timber joist Solution Example 3.1 : Design of a straight timber joist Check the shear capacity of the joist. VEd = ?d • 12 = 2>° • 4>5 z 2 = 4>5 kN ► This shows that VEd < VRd, that is the joist has sufficient shear capacity. Example 3.2 : Bearing strength for the support a of timber joist = 1,04 MPa ► This shows that the bearing capacity at the end supports is sufficient. Example 3.3 : Capacity of a notched timber beam Check the capacity of the beam in figure 3.1 with regard to the ultimate limit state. = 5,1~5,2 = 17,2 kNm “8 8 ► This shows that VEd 2 V/ 0’05 0,78-2152 1081-2400 •10800 = 150 MPa ► Since 1 relm F RV = 3,04-4-35 = 426N f ..= 70-10-6-3902 = 10,6 MPa => F , = 10,6-62 = 383N 4.2.3.3 Fastener capacity 4.2.4 Connection design Example 4.3 : Design of bolted connection in tension 4.3.1 Problem description 4.3.2 Strength parameters 4.3.3 Resistance for a single bolt 4.3.3.1 Shear capacity 0,5/h2kf2rf = 0,5 • 26,9-10® -0,090-0,016 = 19,3kN l,15j2MvWJL2kd = 1,15 J2-146-26,9-IO6-0,016 = 12,9 kN 4.3.3.2 Withdrawal capacity Fm,washer,Rk = 3 • 2,5 ■ 3016 = 22,6 kN/side 4.3.3.3 Bolt resistance 4.3.4 Connection layout 4.3.5 Group effect Example 4.4 : Design of moment resisting column base 3. Modification factors 5. Embedding strength 6. Yield moment, nail 7. Axial withdrawal capacity 8. Shear capacity of the nails 4AfvRk 2 + ^--1 Fv*kfi = 2,3^9925-21,1-4 = 2,11 kN 9. Nail spacing ► The capacity of the nails is enough to withstand the forces. Composite timber elements Example 5.1: Design of an OSB-webbed I-girder (ULS and SLS) User defined units: Material properties Characteristic and design material properties of C24 timber (solid timber), see Volume 2, table 3.3. Characteristic and design material properties of OSB/3, see Volume 2: table 3.10. Design loads in the ULS, according to Eurocode 0 Cross sectional properties in., = ) = 1,14 • 109mm4 3,79