Documentatin-Midas - .mcb.mct commoand text file 1.0...

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Unformatted text preview: .mcb *.mct commoand text file 1.0 Section Beta Angle - ECS Z axis with GCS X axis or ECS X-Z plane with GCS Z axis Orientation When elements are of a line type (Truss, Beam, etc.), Beta Angle, the coordinates of Reference Point, If the coordinates of the Reference Point are entered, midas Civil internally computes the angle of the If the coordinates of the Reference Vector are entered, z-axis of an element is placed on the plane con midas Civil uses the Beta Angle (β) conventions to identify the orientation of each cross-section. The B If the ECS x-axis for a line element is parallel with the GCS Z-axis, the Beta angle is defined as the an (a) Case of vertical members (ECS x-axis is parallel with the global Z-axis) (b) Case of horizontal or diagonal members (ECS x-axis is not parallel with the global Z-axis.) Beta Angle Conventions 2.0 Offset Point on Section Offset: Specify the section Offset from the location options shown in the figure below. Horizontal Offset: Specify the Offset in the transverse direction. "to Extreme Fiber" assigns the offset For a specific location of Offset, select 'User"and enter the distance from the "Centroid" to the desired Offset lo as the "User" type. For a tapered (non-prismatic) section, data input for the J-end also becomes activated. Vertical Offset: Specify the Offset in the vertical direction. "to Extreme Fiber" assigns the offset to the Note 1 When Offset distance is specified, a positive (+) sign applies to Center-to-outward for Centroid reference and Extreme-to-inw Note 2 Node-based loads such as Nodal Loads and Specified Displacements are always applied at the nodes. However, element-ba User Offset Reference: When section offset distance is specified as the "User" ty Centroid: Specify the offset distance relative to the centroid of the section. Extreme Fiber(s): Specify the offset distance relative to Left/Right & Top/Bottom. Note 3 When User type is specified, the Offset distance and direction are entered Note 4 When FCM Wizard is used, and "Apply the Centroid of Pier Table Section O Offset: Center-Top User Offset Reference: Extreme Fiber(s) Vertical Offset: User, Offset Distance (i & j) = Pier Table section height-Cen Internal process of section offset A beam element is defined by two nodes and a line connecting the two nodes. This line becomes a reference line representin which usually coincides with the neutral axis of the beam element. If a section offset is assigned to a section, the neutral axis element reference line is placed at the offset location. The reference line is used for selecting the element, assigning loads, d of the neutral axis of the member relative to the reference line in turn is reflected in analysis as shown in the figure (c) below. Loaded location 1. Nodal Load When an offset is assigned to a section, a nodal load remains applied to the corresponding node regardless of the offset. Th 2. Element Beam Loads Element beam load is applied to the neutral axis of the element regardless of the section offset position. In the diagram belo the element beam load is applied to the neutral axis even though the section is offset from the reference line. Therefore torsio Note however that the element beam load is displayed on the reference line as if it is applied to the reference line, but it is ac Calculation of member forces of the elements for which section off Member forces (axial force, shear force, moment & torsion) of a beam element are calculated relative to the neutral axis. This the member force diagrams are displayed on the reference line. This does not mean the member forces are calculated relativ Member forces diagram when section offset is applied Comparison between section offset and beam end offset An offset of a section can be defined using the Beam End Offset function. F i-end and j-end identically. However, Beam End Offset can assign different In addition, Section offset and Beam End Offset cannot be assigned simult Modeling of a tapered section group when a Section offset (Center-Top) is defined : Display the Offset specified from the Change Offset dialog box in 3. Floor Load Type Convert to Beam Load Type If beam elements are subsequently added to an existing loaded plane, the floor load is automatically re Use this function to convert the floor load into beam loads when the floor load is not to be applied to the added Note 1 When the magnitude of the floor load is to be changed, modify only the value of Floor Load Type. Then, the modified load is a if Convert to Beam Load Type has been selected and Floor Load is revised, the modification is meaningless. The loads to be 4. Intergal Boundary what is ground level ?? ane with GCS Z axis inates of Reference Point, or Reference Vector are specified to define the orientation of sections. computes the angle of the point and enters the angle as a Beta Angle automatically. is placed on the plane containing the Vector. each cross-section. The Beta Angle relates the ECS to the GCS. The ECS x-axis starts from node N1 and passes through angle is defined as the angle formed from the GCS X-axis to the ECS z-axis. The ECS x-axis becomes the axis of rotation th the global Z-axis.) e Fiber" assigns the offset to the outer-most point. roid" to the desired Offset location. Unless the Offset is "Center-Center" the Horizontal Offset can be entered also becomes activated. r" assigns the offset to the outer-most point. For a specific location of Offset, select "User" and enter the distance from "Cen id reference and Extreme-to-inward for Extreme Fiber reference. the nodes. However, element-based loads such as Beam Loads and Temperature Loads are applied on the center line of the element section. Please f Note however that the element beam load is displayed on the reference line as if it is applied to the reference line, but it is ac ance is specified as the "User" type, define the reference location. he centroid of the section. ative to Left/Right & Top/Bottom. tance and direction are entered relative to Centroid irrespective of the Center option (Centroid or Center of Section). For example, specifying "Offset: L Centroid of Pier Table Section Option" is selected, the node locations of the girder will be changed as follows: = Pier Table section height-Centroid of Pier Table section mes a reference line representing the beam element, ned to a section, the neutral axis of the member shifts by the specified offset distance, and the g the element, assigning loads, displaying member forces, etc. The offset as shown in the figure (c) below. node regardless of the offset. This results in moments due to the offset to the neutral axis as shown in the case of figure b. set position. In the diagram below, e reference line. Therefore torsional moment from the element beam load is not induced by the offset. to the reference line, but it is actually applied to the neutral axis. ements for which section offset is applied d relative to the neutral axis. This is true even when a section offset is applied. However, mber forces are calculated relative to the reference line. nd beam end offset the Beam End Offset function. For a prismatic section, a Section offset is assigned to both End Offset can assign different offsets at i-end and j-end independently. Section offset is more useful for a tapered section as opposed to Beam End O Offset cannot be assigned simultaneously. In such a case, Section offset is ignored, and Beam End Offset only becomes effective. hange Offset dialog box in the guide diagram of Section Data window. oor load is automatically redistributed reflecting the added elements. ot to be applied to the added elements. But remember the consequence as per note 1 ype. Then, the modified load is applied to the model. However, is meaningless. The loads to be applied on the beam elements must be changed directly. ound level ?? node N1 and passes through node N2 for all line elements. The ECS z-axis is defined to be parallel with the direction of "I" xis becomes the axis of rotation for determining the angle using the right-hand rule. If the ECS x-axis is not parallel with the G Natural Section orientation of Verrical and Horizontal memb d enter the distance from "Centroid" to the desired Offset location. Unless the Offset is "Center-Center" the Vertical Offset c r line of the element section. Please find the difference in the following example. plied to the reference line, but it is actually applied to the neutral axis. n). For example, specifying "Offset: Left-Center", "Center Loc.: Center of Section" and "Horizontal offset: 0.5 " User type" will result in an Offset 0.5" to d section as opposed to Beam End Offset as shown in the figure below. comes effective. parallel with the direction of "I" dimension of cross-sections. That is, the y-axis is in the strong axis direction. The use of the S x-axis is not parallel with the GCS Z-axis, the Beta angle is defined as the right angle to the ECS x-z plane from the GCS Z l and Horizontal member with bita angle is zero er-Center" the Vertical Offset can be entered as the "User" type. For a tapered (non-prismatic) section, data input for the J-e er type" will result in an Offset 0.5" to the left of the Centroid. And if the Offset option is "Left-Center" and the Center option is Center of Section the Use g axis direction. The use of the right-hand rule prevails in the process. ECS x-z plane from the GCS Z-axis (See below). c) section, data input for the J-end also becomes activated. ter option is Center of Section the User type for Horizontal offset becomes activated and the User type for Vertical offset becomes inactivated. The Hori offset becomes inactivated. The Horizontal offset defined as User type here becomes the Centroid, and the Vertical offset fixed to Center becomes the cal offset fixed to Center becomes the "Center of Section" 1 AC 2 PE 3 QP 4 TOP 5 CSC 6 URA 7 WD 8 BP 9 ST 10 FSSD 11 CBPU 12 PUB 13 EMA 14 WP 15 PP 16 CD 17 FSC 18 DC 20 LEW 21 EDA 22 DA Accreditor Checker Preffessional Engineer Qualified Personel Temporary Occupation Permit Certificate of Statutory Completion Urban Redevelopment Authority Written Direction Building Plan Structure Plan Fire Safety Selter Department Public Utility Board Written Permission Provissional Permission Civil Defence Fire Safety Certificate Development Control Electronics Development Application Development Application 4to11 33 36 42to49 78to85 111to122 199to206 228 231 237to244 269to278 206 228 231 237to244 269to278 ...
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