Function
- In steel-concrete composite beams, due to compatibility conditions, creep and shrinkage of concrete part of the cross-section (concrete slab) results in a redistribution of stresses. When deformation of shortening happens in the concrete part, the steel part of the cross-section prevents free deformation of concrete. As a result of restrained deformation, tensile stresses appear in concrete slab, Due to equilibrium, compressive stresses in the steel part of cross-section appear as well. Also, these self-restraint stresses of composite sections can occur due to nonlinear temperature gradient in the cross-section. This kind of self-restraint stresses of composite sections can be checked in a table in the form of Spread Sheet. The ‘Self-Constraint Force & Stress’ table will be inactivated if the ‘Self-Constraint Forces and Stresses’ option in the ‘Construction Stage Analysis Control Data’ dialog is checked off.
- Table Tool in midas Civil offers a variety of powerful built-in functions. Refer to Usage of Table Tool for detail directions:
Call
From the main menu select [Results] tab > [Type : Analysis result] > [Table] group > [Results Tables] > [Composite Section for C.S.] > [Self-Constraint Force & Stress]
Input
Refer to "Construction Stage Analysis Control"
Refer to Usage of Table Tool and check the following data
Beam Force
Elem : Element number
Load : Unit load case/combination
Stage : Construction stage
Step : Sub-stage
Section Part : Part Number in composite section
Part : Output position along the length of each element
Axial : Self-restraint axial force
Moment-y : Self-restraint bending moment about the element's local y-axis
Moment-z : Self-restraint bending moment about the element's local z-axis
Beam Stress
Elem : Element number
Load : Unit load case/combination
Stage : Construction stage
Step : Sub-stage
Section Part : Part Number in composite section
Part : Output position along the length of each element
Axial : Self-restraint axial stress
Bend(+y) : Self-restraint bending stress due to moment about the element's local z-axis
Bend(-y) : Self-restraint bending stress due to moment about the element's local z-axis
Bend(+z) : Self-restraint bending stress due to moment about the element's local y-axis
Bend(-z) : Self-restraint bending stress due to moment about the element's local y-axis
Cb(min/max) : Max. combined self-restraint stress among the absolute values of Cb1, Cb2, Cb3 and Cb4
Cb1(-y+z) : Axial + Bend(-y) + Bend(+z)
Cb2(+y+z) : Axial + Bend(+y) + Bend(+z)
Cb3(+y-z) : Axial + Bend(+y) + Bend(-z)
Cb4(-y-z) : Axial + Bend(-y) + Bend(-z)
Cb Cent : Combined self-restraint stress at the centroid of concrete