IfcStructuralLoadResource(结构荷载资源)
ifcstructuralloadrence包含结构荷载、结果、边界条件和连接条件的定义。这些定义规定了力、力矩、刚度、位移和其他因素。
荷载资源定义用于IFC模型的其他部分，特别是用于将荷载定义放置到二维或三维空间中的结构动作和反作用力的定义。
Types
1 IfcModulusOfRotationalSubgradeReactionSelect (路基转动反力模量的选择)
IfcModulusOfRotationalSubgradeReactionSelect 是一种测量方法，表示每段结构曲线的旋转层理。TRUE表示无限刚度（刚度）。FALSE表示没有刚度（释放）。数值表示有限的线弹性刚度。
2 IfcModulusOfSubgradeReactionSelect (路基反力模量选择)
表示每个区域结构面项目层理的层理测量。TRUE表示无限刚度（刚度）。FALSE表示没有刚度（释放）。数值表示有限的线弹性刚度。
3 IfcModulusOfTranslationalSubgradeReactionSelect (平动路基反力模量选择)
4 IfcRotationalStiffnessSelect (旋转刚度选择)
转动刚度的量度。TRUE表示无限刚度（刚度）。FALSE表示没有刚度（释放）。数值表示有限的线弹性刚度。
5 IfcTranslationalStiffnessSelect (平移刚度选择)
线性刚度的量度。TRUE表示无限刚度（刚度）。FALSE表示没有刚度（释放）。数值表示有限的线弹性刚度。
6 IfcWarpingStiffnessSelect (扭曲刚度选择)
Entities
1 IfcBoundaryCondition (边界条件)
抽象实体IfcBoundaryCondition是可应用于结构连接定义的所有边界条件的超类型，可以直接用于连接（例如连接）或用于结构构件与连接之间的关系。
2 IfcBoundaryEdgeCondition (边界条件)
描述线性弹性支承条件或连接条件。
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | TranslationalStiffnessByLengthX | IfcModulusOfTranslationalSubgradeReactionSelect | [0:1] | Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 3 | TranslationalStiffnessByLengthY | IfcModulusOfTranslationalSubgradeReactionSelect | [0:1] | Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 4 | TranslationalStiffnessByLengthZ | IfcModulusOfTranslationalSubgradeReactionSelect | [0:1] | Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 5 | RotationalStiffnessByLengthX | IfcModulusOfRotationalSubgradeReactionSelect | [0:1] | Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object. | X |
| 6 | RotationalStiffnessByLengthY | IfcModulusOfRotationalSubgradeReactionSelect | [0:1] | Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object. | X |
| 7 | RotationalStiffnessByLengthZ | IfcModulusOfRotationalSubgradeReactionSelect | [0:1] | Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object. | X |
3 IfcBoundaryFaceCondition (边界界面条件)
描述线性弹性支承条件或连接条件。
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | TranslationalStiffnessByAreaX | IfcModulusOfSubgradeReactionSelect | [0:1] | Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 3 | TranslationalStiffnessByAreaY | IfcModulusOfSubgradeReactionSelect | [0:1] | Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 4 | TranslationalStiffnessByAreaZ | IfcModulusOfSubgradeReactionSelect | [0:1] | Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object. | X |
4 IfcBoundaryNodeCondition (边界节点条件)
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | TranslationalStiffnessX | IfcTranslationalStiffnessSelect | [0:1] | Translational stiffness value in x-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 3 | TranslationalStiffnessY | IfcTranslationalStiffnessSelect | [0:1] | Translational stiffness value in y-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 4 | TranslationalStiffnessZ | IfcTranslationalStiffnessSelect | [0:1] | Translational stiffness value in z-direction of the coordinate system defined by the instance which uses this resource object. | X |
| 5 | RotationalStiffnessX | IfcRotationalStiffnessSelect | [0:1] | Rotational stiffness value about the x-axis of the coordinate system defined by the instance which uses this resource object. | X |
| 6 | RotationalStiffnessY | IfcRotationalStiffnessSelect | [0:1] | Rotational stiffness value about the y-axis of the coordinate system defined by the instance which uses this resource object. | X |
| 7 | RotationalStiffnessZ | IfcRotationalStiffnessSelect | [0:1] | Rotational stiffness value about the z-axis of the coordinate system defined by the instance which uses this resource object. | X |
5 IfcBoundaryNodeConditionWarping (边界节点条件扭曲)
6 IfcFailureConnectionCondition (故障连接条件)
7 IfcSlippageConnectionCondition (滑移连接条件)
8 IfcStructuralConnectionCondition (结构连接条件)
9 IfcStructuralLoad (结构荷载)
这个抽象实体是所有荷载（作用或反作用）或结构分析产生的某些要求或影响结构分析的某些规定的超类型。
10 IfcStructuralLoadConfiguration (结构荷载配置)
这个类将一个或多个加载或结果值组合成一维或二维配置。
■所有价值项目应为同一类型。
■如果荷载或结果包含曲线活动，则应给出一维位置，并沿曲线局部测量。位置不得超过曲线活动范围。荷载样本和相应位置应按位置升序给出。
■如果荷载或结果包含表面活动，则应给出二维位置，并在表面活动的局部x和y方向上进行测量。位置不得超过地表活动范围。
11 IfcStructuralLoadLinearForce (结构荷载线力)
实体IfcStructuralLoadLinearForce的实例应用于定义曲线上的动作。
Attribute definitions
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | LinearForceX | IfcLinearForceMeasure | [0:1] | Linear force value in x-direction. | X |
| 3 | LinearForceY | IfcLinearForceMeasure | [0:1] | Linear force value in y-direction. | X |
| 4 | LinearForceZ | IfcLinearForceMeasure | [0:1] | Linear force value in z-direction. | X |
| 5 | LinearMomentX | IfcLinearMomentMeasure | [0:1] | Linear moment about the x-axis. | X |
| 6 | LinearMomentY | IfcLinearMomentMeasure | [0:1] | Linear moment about the y-axis. | X |
| 7 | LinearMomentZ | IfcLinearMomentMeasure | [0:1] | Linear moment about the z-axis. | X |
12 IfcStructuralLoadOrResult (结构荷载或结果)
13 IfcStructuralLoadPlanarForce (结构荷载平面力)
14 IfcStructuralLoadSingleDisplacement (结构荷载单位移动)
15 IfcStructuralLoadSingleDisplacementDistortion (结构荷载单位移动变形)
16 IfcStructuralLoadSingleForce (结构荷载单力)
17 IfcStructuralLoadSingleForceWarping (结构荷载单力扭曲)
18 IfcStructuralLoadStatic (静态结构荷载)
抽象实体ifcsstructuralloadstatic是可以定义的所有静荷载（作用或反作用）的超类型。范围内是单一的，即集中的力和力矩，线性的，即一维分布的力和力矩，平面的，即二维分布的力，以及位移和温度荷载。
19 IfcStructuralLoadTemperature (结构荷载温度)
实体IfcStructuralLoadTemperature的实例应用于定义由温度变化引起的动作。如图407所示，温度的变化用一个应用于整个截面的恒定值和截面外部纤维之间的温差值给出。
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | DeltaTConstant | IfcThermodynamicTemperatureMeasure | [0:1] | Temperature change which affects the complete section of the structural member, or the uniform portion of a non-uniform temperature change.
NOTE A positive value describes an increase in temperature. I.e. a positive constant temperature change causes elongation of a member, or compression in the member if there are respective restraints. |
X |
| 3 | DeltaTY | IfcThermodynamicTemperatureMeasure | [0:1] | Non-uniform temperature change, specified as the difference of the temperature change at the outer fibre of the positive y direction minus the temperature change at the outer fibre of the negative y direction of the analysis member.
NOTE A positive non-uniform temperature change in y induces a negative curvature of the member about z, or a positive bending moment about z if there are respective restraints. y and z are local member axes. |
X |
| 4 | DeltaTZ | IfcThermodynamicTemperatureMeasure | [0:1] | Non-uniform temperature change, specified as the difference of the temperature change at the outer fibre of the positive z direction minus the temperature change at the outer fibre of the negative z direction of the analysis member.
NOTE A positive non-uniform temperature change in z induces a positive curvature of the member about y, or a negative bending moment about y if there are respective restraints. y and z are local member axes. |
X |
20 IfcSurfaceReinforcementArea (表筋面积)
描述表面构件所需或提供的加固区域。
Attribute definitions
| # | Attribute | Type | Cardinality | Description | C |
|---|---|---|---|---|---|
| 2 | SurfaceReinforcement1 | IfcLengthMeasure | L[2:3] | Reinforcement at the face of the member which is located at the side of the positive local z direction of the surface member. Specified as area per length, e.g. square metre per metre (hence length measure, e.g. metre). The reinforcement area may be specified for two or three directions of reinforcement bars. | X |
| 3 | SurfaceReinforcement2 | IfcLengthMeasure | L[2:3] | Reinforcement at the face of the member which is located at the side of the negative local z direction of the surface member. Specified as area per length, e.g. square metre per metre (hence length measure, e.g. metre). The reinforcement area may be specified for two or three directions of reinforcement bars. | X |
| 4 | ShearReinforcement | IfcRatioMeasure | [0:1] | Shear reinforcement. Specified as area per area, e.g. square metre per square metre (hence ratio measure, i.e. unitless). | X |
Formal Propositions
| Rule | Description |
|---|---|
| SurfaceAndOrShearAreaSpecified | At least one of the reinforcement area attributes shall be specified. |
| NonnegativeArea1 | Surface reinforcement area must not be less than 0. |
| NonnegativeArea2 | Surface reinforcement area must not be less than 0. |
| NonnegativeArea3 | Shear reinforcement area must not be less than 0. |
