EWPAA Structural Plywood and LVL Design Manual - Engineered ...

Design of Moment Resisting Nailed ConnectionsThis topic was treated in detail in Chapter 10 of this Manual.Serviceability Requirements for Type 1 Nailed and Screwed Joints(Cl.C3.2)Section C3 of Appendix C of AS 1720.1-1997 gives some explanation regarding thedeformation of joints.The displacement of nailed or screwed joints in single shear for solid wood/solid woodconnections may be estimated as follows:To determine Q* at ∆ = 0.5mm:2⎡44x j12⎤ ⎡Q* ⎤∆ = ⎢for∆ < 0.5mm3.5 ⎥ ⎢ ⎥(13.5)⎣ D ⎦ ⎣h32⎦1.75* 0.107D hQ320.5 = (13.6)0.5j12For a displacement of ∆ = 2.5mm:Q* 1.752.5 = 0.165D j13h32(13.7)For a displacement 0.5mm < ∆ < 2.5mm the corresponding applied load effect Q* should beobtained by linear interpolation between the values to give:where:∆ = 0.5mm and ∆ = 2.5mm∆ = Deformation of a single nail in a Type 1connection;D = Nail diameter (mm);j 12jj1332= Special duration of load factor for serviceability ofnailed connections;= Special duration of load factor for serviceability ofnailed connections;= Stiffness factor for serviceability of nailedconnections;Q* = Serviceability load effect on a single nail (N);Q*0.5Q*2.5= Serviceability load effect on a single nail when thedeformation is 0.5mm;= Serviceability load effect on a single nail when thedeformation is 2.5mm;Note:For plywood side plates Equations 13.5 and 13.6 result in conservative overestimatesof connector slip.13.7 Nailed Connections – Design ExampleA spliced connection is to be designed for a LVL tension member to be used in a roof systemfor a commercial building in Brisbane. The member has been designed and is 150mm deep x35mm thick. The splice plates are to be of 12mm thick F11 structural plywood fixed using2.8mnm diameter gun driven nails.196