SelfConstraint Force & Stress 


In steelconcrete composite beams, due to compatibility conditions, creep and shrinkage of concrete part of the crosssection (concrete slab) results in a redistribution of stresses. When deformation of shortening happens in the concrete part, the steel part of the crosssection 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 crosssection appear as well. Also, these selfrestraint stresses of composite sections can occur due to nonlinear temperature gradient in the crosssection. This kind of selfrestraint stresses of composite sections can be checked in a table in the form of Spread Sheet. The ‘SelfConstraint Force & Stress’ table will be inactivated if the ‘SelfConstraint 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 builtin functions. Refer to Usage of Table Tool for detail directions: 



From the Main Menu select Results > Result Tables > Composite Section for C.S. > SelfConstraint Force & Stress 


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: Substage Section Part: Part Number in composite section Part: Output position along the length of each element Axial: Selfrestraint axial force Momenty: Selfrestraint bending moment about the element's local yaxis Momentz: Selfrestraint bending moment about the element's local zaxis Beam Stress Elem: Element number Load: Unit load case/combination Stage: Construction stage Step: Substage Section Part: Part Number in composite section Part: Output position along the length of each element Axial: Selfrestraint axial stress Bend(+y): Selfrestraint bending stress due to moment about the element's local zaxis Bend(y): Selfrestraint bending stress due to moment about the element's local zaxis Bend(+z): Selfrestraint bending stress due to moment about the element's local yaxis Bend(z): Selfrestraint bending stress due to moment about the element's local yaxis Cb(min/max): Max. combined selfrestraint 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(+yz): Axial + Bend(+y) + Bend(z) Cb4(yz): Axial + Bend(y) + Bend(z) Cb Cent: Combined selfrestraint stress at the centroid of concrete 
