IFC 4.3.2.20240512 (IFC4X3_ADD2) under development

Annex E
(informative)

Examples

E.8.1 - Structural Curve Member

Example overview

 The structural analysis model includes the idealizations of structural elements with loads and boundary conditions.

 This example includes three structural curve members forming a simple frame, and a single load case of a linear distributed load.

The example includes three structural curve members connected in series, forming two columns and a beam, where the columns have rigid boundary conditions with respect to the ground. Each curve member has a material profile set defined using an I-Shape profile of steel material. The profile has properties indicating area and moments of inertia. The material has properties indicating density, modulus of elasticity, modulus of rigidity, and yield strength. One load case is defined, having a constant linear distribution over half of the beam. See Figure E.A for the geometric and topological representation of the structural members.

structural_analysis_fig-1.png 118,0 KB
Figure E.A — Structural members and actions

The load case has calculated results included, consisting of point forces and moments at each point connection on the ground. See Figure E.B for the represenation of the structural members with reactions.

structural_analysis_fig-2.png 109,0 KB
Figure E.B — Structural members and reactions

The IfcRelConnectsStructuralElements relationship links a curve member to a point connection. See Figure E.C for an instantiation diagram.

structural_analysis_fig-3.png 48,1 KB
Figure E.C — Structural connection graph

The IfcRelConnectsStructuralActivity relationship links a load action to a curve member. See Figure E.D for an instantiation diagram.

structural_analysis_fig-4.png 43,1 KB
Figure E.D — Structural load graph

IFC-SPF source

ISO-10303-21;
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ENDSEC;

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/* Project coordinate system */
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#211= IFCAXIS2PLACEMENT3D(#210,$,$);
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/* Analysis model is declared on project; this distinguishes top-level analysis models from potential aggregated sub-models */
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/* The structural member for the left column (object) */
#228= IFCSTRUCTURALCURVEMEMBER('3eXlZ8csrAvfIIXVwC_gVP',#209,'Curve Member #1',$,$,$,#255,.RIGID_JOINED_MEMBER.,#230);
#230= IFCDIRECTION((1.,0.,0.));

/* The structural node underneath the left column */
#232= IFCCARTESIANPOINT((0.,0.,0.));
#233= IFCVERTEXPOINT(#232);
#234= IFCTOPOLOGYREPRESENTATION(#212,'Reference','Vertex',(#233));
#235= IFCPRODUCTDEFINITIONSHAPE($,$,(#234));
#236= IFCSTRUCTURALPOINTCONNECTION('3539fAVu96i8mFr0cgUqeI',#209,'Point Connection #1',$,$,$,#235,#242,$);

/* assignment of connections and members to the analysis model */
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/* fixed restraint at node underneath left column */
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/* The structural node above the left column */
#243= IFCCARTESIANPOINT((0.,0.,120.));
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/* The structural member for the left column (representation) */
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#255= IFCPRODUCTDEFINITIONSHAPE($,$,(#253));
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#260= IFCRELCONNECTSSTRUCTURALMEMBER('1GClK7cwT80xzpZuaAlGXp',#209,$,$,#228,#247,$,$,$,$);

/* The structural member for the right column (object) */
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#265= IFCDIRECTION((1.,0.,0.));

/* The structural node underneath the right column */
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#268= IFCVERTEXPOINT(#267);
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#270= IFCPRODUCTDEFINITIONSHAPE($,$,(#269));
#271= IFCSTRUCTURALPOINTCONNECTION('1dqi3aUQP3yeww5muaF15h',#209,'Point Connection #3',$,$,$,#270,#275,$);
#275= IFCBOUNDARYNODECONDITION('Fixed',IFCBOOLEAN(.T.),IFCBOOLEAN(.T.),IFCBOOLEAN(.T.),IFCBOOLEAN(.T.),IFCBOOLEAN(.T.),IFCBOOLEAN(.T.));

/* The structural node connecting the right column to the beam */
#276= IFCCARTESIANPOINT((192.,0.,120.));
#277= IFCVERTEXPOINT(#276);
#278= IFCTOPOLOGYREPRESENTATION(#212,'Reference','Vertex',(#277));
#279= IFCPRODUCTDEFINITIONSHAPE($,$,(#278));
#280= IFCSTRUCTURALPOINTCONNECTION('0IHrRf6abAZwDys7n7fbS2',#209,'Point Connection #4',$,$,$,#279,$,$);

/* The structural member for the right column (representation) */
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#286= IFCTOPOLOGYREPRESENTATION(#212,'Reference','Edge',(#285));
#288= IFCPRODUCTDEFINITIONSHAPE($,$,(#286));
#291= IFCRELCONNECTSSTRUCTURALMEMBER('0r1xJykBf1OOYUn7dRt3DM',#209,$,$,#263,#271,$,$,$,$);
#293= IFCRELCONNECTSSTRUCTURALMEMBER('1$D3QsVBj2kf4iUp5hUEu2',#209,$,$,#263,#280,$,$,$,$);

/* The structural member for the beam */
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/* single load case */
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/* linear load along left half of beam */
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#326= IFCSTRUCTURALLOADCONFIGURATION($,(#327,#329),((96.),(192.)));
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/* Material profile set associated with each structural member */
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#372= IFCMATERIALPROPERTIES('Pset_MaterialCommon',$,(#371),#353);
#375= IFCPROPERTYSINGLEVALUE('YoungModulus',$,IFCMODULUSOFELASTICITYMEASURE(29.),$);
#376= IFCPROPERTYSINGLEVALUE('ShearModulus',$,IFCMODULUSOFELASTICITYMEASURE(11.2),$);
#379= IFCMATERIALPROPERTIES('Pset_MaterialMechanical',$,(#375,#376),#353);

/* Profile and properties */
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#966= IFCPROPERTYSINGLEVALUE('CrossSectionArea',$,IFCAREAMEASURE(8.84),$);
#974= IFCPROPERTYSINGLEVALUE('MomentOfInertiaY',$,IFCMOMENTOFINERTIAMEASURE(170.),$);
#975= IFCPROPERTYSINGLEVALUE('MomentOfInertiaZ',$,IFCMOMENTOFINERTIAMEASURE(16.7),$);
#985= IFCPROPERTYSINGLEVALUE('TorsionalSectionModulus',$,IFCSECTIONMODULUSMEASURE(0.622),$);
#990= IFCPROFILEPROPERTIES('Pset_ProfileMechanical',$,(#965,#966,#974,#975,#985),#419);

/* The result group indicating reactions for the load case */
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/* The node below the left column has no displacement (it has fixed boundary condition so it shouldn't) */
#2732= IFCSTRUCTURALLOADSINGLEDISPLACEMENT($,0.,0.,0.,0.,0.,0.);
#2733= IFCSTRUCTURALPOINTREACTION('0Ci9_J7iLDhuBtYHGEpcTw',#209,$,$,$,$,$,#2732,.GLOBAL_COORDS.);
#2735= IFCRELCONNECTSSTRUCTURALACTIVITY('2nVw9fFML1G8QuiGnXOdEh',#209,$,$,#236,#2733);

/* Each reaction is assigned to the result group. */
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/* The node below the left column has a reaction with force upwards and to the right and moment counter-clockwise as facing +Y */
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#2741= IFCSTRUCTURALPOINTREACTION('1VIuS9lz50U9$sbX2t8CSb',#209,$,$,$,$,$,#2740,.GLOBAL_COORDS.);
#2743= IFCRELCONNECTSSTRUCTURALACTIVITY('2l0cjBJHH8nxFBsGxDKSfi',#209,$,$,#236,#2741);

/* The node above the left column has a displacement to the left (sway) */
#2746= IFCSTRUCTURALLOADSINGLEDISPLACEMENT($,-0.00112040278567376,0.,-7.54271659073925E-05,0.,3.08969735441016E-05,0.);
#2747= IFCSTRUCTURALPOINTREACTION('2Xxob9ZATFeQmLnunjg4E$',#209,$,$,$,$,$,#2746,.GLOBAL_COORDS.);
#2749= IFCRELCONNECTSSTRUCTURALACTIVITY('2iaDWtrbn6W9TfDxfsikIH',#209,$,$,#247,#2747);

/* The node below the right column has no displacement (it has a fixed boundary condition so it shouldn't) */
#2752= IFCSTRUCTURALLOADSINGLEDISPLACEMENT($,0.,0.,0.,0.,0.,0.);
#2753= IFCSTRUCTURALPOINTREACTION('2YqhTmxQv6_AQPAcaE66Xu',#209,$,$,$,$,$,#2752,.GLOBAL_COORDS.);
#2755= IFCRELCONNECTSSTRUCTURALACTIVITY('0yGyLgS9T3Y9D6VtgcdAkS',#209,$,$,#271,#2753);

/* The node below the right column has a reaction with force updwards and to the left and moment clockwise as facing +Y */
#2758= IFCSTRUCTURALLOADSINGLEFORCE($,-1422.73493120008,0.,7321.47102988085,0.,-43375.4476654014,0.);
#2759= IFCSTRUCTURALPOINTREACTION('1b1zM4uHz8exw0fvIGvpGQ',#209,$,$,$,$,$,#2758,.GLOBAL_COORDS.);
#2761= IFCRELCONNECTSSTRUCTURALACTIVITY('0Whra2O$v9wePeIU6IImNQ',#209,$,$,#271,#2759);

/* The node above the right column has a displacement to the left (sway) */
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#2765= IFCSTRUCTURALPOINTREACTION('33628eH254VAe0O7d63nzI',#209,$,$,$,$,$,#2764,.GLOBAL_COORDS.);
#2767= IFCRELCONNECTSSTRUCTURALACTIVITY('2ukIn71Pr2VwtcAQ5GPi8T',#209,$,$,#280,#2765);

/* The member for the left column has end reactions for which shear and moment diagrams may be derived */
#2770= IFCSTRUCTURALLOADSINGLEFORCE('Head',2278.52897011915,0.,-1422.66326629449,0.,66694.8548930371,0.);
#2771= IFCSTRUCTURALLOADSINGLEFORCE('Tail',-2278.52897011915,0.,1422.66326629449,0.,104027.289932507,0.);
#2772= IFCSTRUCTURALLOADCONFIGURATION('Member End Reactions',(#2770,#2771),((0.),(120.)));
#2773= IFCSTRUCTURALCURVEREACTION('0SH7YcIWrB8Q4VcWjfXpnn',#209,$,$,$,$,$,#2772,.GLOBAL_COORDS.,.DISCRETE.);
#2775= IFCRELCONNECTSSTRUCTURALACTIVITY('2vTn7XCur6sByitir9a9jj',#209,$,$,#228,#2773);

/* The member for the right column has end reactions for which shear and moment diagrams may be derived */
#2778= IFCSTRUCTURALLOADSINGLEFORCE('Head',7321.47102988085,0.,1422.73493120008,0.,-43375.4476654014,0.);
#2779= IFCSTRUCTURALLOADSINGLEFORCE('Tail',-7321.47102988085,0.,-1422.73493120008,0.,-127343.989381682,0.);
#2780= IFCSTRUCTURALLOADCONFIGURATION('Member End Reactions',(#2778,#2779),((0.),(120.)));
#2781= IFCSTRUCTURALCURVEREACTION('1L3TtLyyPEzgk1VyvDrWiH',#209,$,$,$,$,$,#2780,.GLOBAL_COORDS.,.DISCRETE.);
#2783= IFCRELCONNECTSSTRUCTURALACTIVITY('23GMRW_cf7tA667rAWkQOC',#209,$,$,#263,#2781);

/* The member for the beam has end reactions for which shear and moment diagrams may be derived */
#2786= IFCSTRUCTURALLOADSINGLEFORCE('Head',1422.69473557039,0.,2278.52222225513,0.,-104030.36194645,0.);
#2787= IFCSTRUCTURALLOADSINGLEFORCE('Tail',-1422.69473557039,0.,7321.47777774487,0.,127353.857770554,0.);
#2788= IFCSTRUCTURALLOADCONFIGURATION('Member End Reactions',(#2786,#2787),((0.),(192.)));
#2789= IFCSTRUCTURALCURVEREACTION('2ssucs0rX8KgBecASOwgSd',#209,$,$,$,$,$,#2788,.GLOBAL_COORDS.,.DISCRETE.);
#2791= IFCRELCONNECTSSTRUCTURALACTIVITY('1tmGmLIfTFnBfWx$tia32R',#209,$,$,#296,#2789);

ENDSEC;

END-ISO-10303-21;

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