Function
- Enter the sectional properties for the following structural elements: Truss, Tension-only, Compression-only, Cable, Gap, Hook, and Beam Element.
- In the SRC tab, you can define the section properties of composite members composed of steel and concrete.
Call
From the main menu, select [Properties] tab > [Section Properties] group > [Section Properties] > [SRC]
Input
Section(SRC) dialog box
Shape
Assign a section shape to use.
New I Cross Section and Combined T-Section were incorporated.
Additional section shapes for SRC-Box-Stiffener and SRC-Pipe-Stiffener.
Concrete Data
Enter the outer dimensions of the RC section of a steel-encased concrete section.
Steel Data
Enter the steel section data.
User : Enter the main dimensions of a standardized section shape.
H, B1, ... : Refer to the dimension information diagram in the dialog box.
DB : Select a section from the DB of the standard sections for a country.
Select a desired DB from the DB list on the right.
KS : Korean Industrial Standards
AISC2K(US) : American Institute of Steel Construction, 2000 (US Unit : lb, in)
AISC2K(SI) : American Institute of Steel Construction, 2000 (SI Unit : kN, m)
AISC : American Institute of Steel Construction
CISC02(US) : Canadian Institute of Steel Construction (US Unit : lb, in)
CISC02(SI) : Canadian Institute of Steel Construction (SI Unit : kN, m)
BS : British Standards
BS indicates BS4-1 revised prior to 1993.
DIN : Deutshes Institut Fur Normung e.v.
JIS : Japanese Industrial Standards
JIS2K : Japanese Industrial Standards 2000
GB-YB : Guojia Biao Zhun-Yejin Bu Biao Zhun
GB-YB05 : Guojia Biao Zhun-Yejin Bu Biao Zhun(2005)
Pacific(SI) : Bentley Pacific Standards (SI Unit : kN, m)
IS84 : Indian Standards
CNS91 : Chinese National Standard - Taiwanese Standards
Steel Name : Enter directly a DB section name or select a desired DB from the Section list. When the section name is directly entered, it must correspond to the format of the DB section names.
Ex) KS, JIS : H 400X200X8/13, AISC : W36X280, CISC : HP310x110, BS : UB 406x178x54, DIN : HD400x288
Material
Enter material properties for steel and concrete constituting steel RC composite sections.
Click to select the material properties for steel and concrete stored in the DB for a country. The following items are automatically entered:
Es/Ec : Modulus of Elasticity Ratio of steel relative to concrete
Ds/Dc : Specific Weight (Density) Ratio of steel relative to concrete
Ps : Poisson's Ratio for steel
Pc : Poisson's Ratio for concrete
Combined Ratio of Conv. : Stiffness Reduction Factor of concrete [Default = 1.0]
When RC is converted into steel for calculating the SRC section stiffness, Conv. Stiffness Factor is applied to reduce the stiffness of RC.
Replace : Assign Steel to be the reference when calculating stiffness of a composite section
In the stiffness calculation of SRC sections, reinforced concrete (RC) is considered as steel by substitution. The self-weight due to different materials is calculated as follows.
Selfweight of SRC = Selfweigth of Steel + Selfweight of RC
When Ds/Dc is input as 0, the self-weight of reinforced concrete (RC) is ignored, and only the self-weight of steel is considered.
midas Civil converts RC into equivalent steel for SRC section stiffness calculation.
Consider Warping Effect (7th DOF)
You have the option to consider the torsional effects. When there is an uneven torsion resulting from the restricted torsional displacement, torque is resisted by St. Venant's torsional shear stress and warping torsion. In cases involving curved members, eccentric loads, or differences between the center of gravity and the shear center, simulating the warping torsion effect using a 1D beam element can provide more accurate results.
When considering the warping effect (7 degrees of freedom), the warping coefficient (Iw), warping functions (w1, w2, w3, w4), and shear deformations due to the twisting moment can be checked in the sectional properties dialog box.
Applicable element types : General beam/Tapered beam
Applicable boundary condition types : Supports, Beam End Release
Applicable analysis types : Linear Static, Eigenvalue, Buckling, Response Spectrum, Construction Stage Analysis, Moving Load Analysis
Post-processing results : Reviewable in reaction forces, displacements, member forces, and stresses.