“Computational Civil Engineering - "Intersections" International Journal

154 Al. Dima, I.R. Răcănelβ, γ, r, θ joint geometry parametersb) The adequacy of the joint may be determined on the basis of:Punching shear, considering the equations:ν p rf sinθβ ≤ ν pa = Qq⋅ Q f ( Fyc0. 6γ)22( ) + ( ν ν ) ≤1= (2)ν (3)p ν paIPBppaOPB22( 2 π ) arcsin ( ν ν ) + ( ν ν ) ≤1ν ν +(4)ppaAXIn the above equations Q q and Q f are factors and AX, IPB and OPB means axial, inplane bending and out of plane bending moments respectively.pc) Nominal loads, considering the equations:N N 2N ≤ N Q Q F T / 1.7 sinθ(5)a =qfycpaIPBp( )paOPBM M2( Qq) ( Q f) FycT( 0.8d)/( 1.7 sinθ )IPB IPBM M2( Q ) ( Q ) F T ( 0.8d)/( 1.7 sinθ )M IPB ≤ ( M a ) IPB =(6)M OPB ≤ ( M a ) OPB = qf yc(7)OPBOPB22( M ) ( M M ) ≤1M (8)a IPB+ a OPB22( 2 ) arcsin ( M M ) + ( M M ) ≤1N N π (9)a + a IPBa OPBIn the above relationships N, M IPB and M OPB are the axial force, in plane bendingmoment and out of plane bending moment respectively, N a , (M a ) IPB and (M a ) OPB arethe allowable values for the same stresses.T thickness of the chord walld diameter of the brace7.2 Buckling check of the structural elementsThe buckling strength of the platform structural elements is checked according tothe relationship given in Germanischer Lloyd’s, Section 3, point 22.4:Γ N kN + β Γ N M + δ ≤(10)where:Γ m , k, β m ,δ nNN p , M p( ) ( ) ( ) 1mpmmcoefficientselastic axial force in the braceplastic axial force and in plane bending moment in the brace.pn8. RESULTS AND CONCLUSIONSThe analyses results, which are given for some elements in tables 1-3, have shownthat for some structural elements, the checks are satisfied near to the limit value.