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Description

Using the MarMOn program, the bending moments in a two-way reinforced concrete slab using the Marcus Method [1,2] can be calculated.

The Marcus Method [1,2] is an adaptation of the Strip Method [3,4]. Marcus Method introduces a correction coefficient to the Rankine-Grashoff Theory of Equal Deflections [1] in order to account for the torsional restraints at the corners of the slab. Thus, the Marcus Method calculates bending moments in a two-way slab assuming equal mid-span deflections in both directions while accounting for the torsion.

In the MarMOn program, slab load and dimensions are first defined by the user. Then, the bending moments are calculated using Marcus Method – i.e. first the hogging ad sagging moments are calculated using the Rankine-Grashoff Theory of Equal Deflections, and subsequently, the sagging moments are corrected using the Marcus correction coefficient to account for torsional moments.

The outputs of the program are tabulated values of bending moments and graphs presenting the bending moments in both directions. For comparison, bending moments determined using Linear Analysis (i.e. moments calculated without accounting for torsion) are also plotted in the graphs.

For detailed information regarding the Marcus Theory see [1,2,5], and for detailed information regarding the program algorithm see [5].