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Composite beam

Description

A simply supported composite beam – steel section and concrete slab – loaded with a uniformly distributed load.
All beams and elements in this space model are defined on the X1-X2 global plane. Beam offsets are used to place the steel section below the slab, thereby generating the increased moment-of-inertia of the composite section. Note that the structure must be defined as a space model in order to specify X3 offsets.

Geometry

Modulus of Elasticity: Concrete: 300,000 t/m2 Steel: 2,100,000 t/m2

Loads

Beam load: FX3 = -1.0 t/m on all beams (total load = 10 t)

Reference

Warren C. Young, Roark’s Formulas for Stress and Strain, Sixth Edition. (Table 3 – Case 2c), 1989 6th edition, McGraw – Hill book company.

Comparison of Results

Location Result type Result Deviation
Theoretical STRAP STRAP

(no offset)

Node 32 Deflection 0.054 m 0.0548 (0.153) 1.5%
Element 10 Neutral axis 79.3 mm 79.0* 0.38%

* The neutral axis location is calculated from the interpolation of +SX and -SX values.

 

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