Skip to main content
Section Data Created Edited

Section Properties - SRC


  • 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.



From the main menu, select [Properties] tab > [Section Properties] group > [Section Properties] > [SRC]



SRC dialog.png

Section(SRC) dialog box



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

NOTE.png 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



Enter material properties for steel and concrete constituting steel RC composite sections.

Click select material from db.png 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]

NOTE.png 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

NOTE.png 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.

NOTE.png 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.

Was this article helpful?