Section Modulus Of Composite Section

Normal inputs for required section modulus values are loadings the geometry present and allowable stresses.

Section modulus of composite section. Record strain reading for about ten values of load. Using the section modulus the bending stress is calculated as σ b m s. The concept of a section modulus is sometimes not very well understood.

Equations for the section moduli of common shapes are given below. Unit of a section modulus is in. This allows for optimization of a beam s cross section to resist bending by maximizing a single parameter.

Further because there is no composite action midspan deflection should be close to that of a naked girder. The section modulus of a structural member or a built up beam system is a geometric indicator of how efficiently the part or system was designed. The elastic section modulus is defined as s i y where i is the second moment of area or moment of inertia and y is the distance from the neutral axis to any given fiber.

University of michigan tcaup structures ii slide 21 given. Therefore the deck slab contribution to section flexural stiffness will be negligible. Any relationship between these properties is highly dependent on the shape in question.

Record modulus of elasticity values for the beam materials. Section modulus is a geometric property for a given cross section used in the design of beams or flexural members. Cross section shapes like rectangular square circular i section and t composite section etc.

For symmetric sections the value of section modulus is for both above and below of centroid of the fiber. Dlslab 62 5 psf dlbeam 135 plf n 1 9 fsteel 24 ksi fy 36 fconc 1 35 ksi for this example the floor capacity is found for two different floor systems. Record load location strain gage locations span of beam and cross section dimensions on a sketch of the beam and its cross section.