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TS 500 column P-M interaction

Uniaxial axial-force / moment interaction curve of a rectangular column by strain compatibility (TS 500 §7.1), with the pure-axial, pure-tension, and balanced points, plus a demand check.

Inputs

Width bmm

Depth hmm

fckMPa

fykMPa

As topmm²

As bottommm²

Cover to bar c.mm

Demand NdkN

Demand MdkN·m

Interaction curve

N0 (pure axial) [kN]—

Ndt (pure tension) [kN]—

Balanced (N, M)—

Demand inside envelope?—

Citations

§7.1Strain compatibility: εcu=0.003, plane sections, 0.85·fcd block, Es=2×10⁵ MPa.

VERIFYVerified: N0 & Ndt exact; the N=0 point matches the independent beam-flexure capacity. k1=0.85 (exact ≤C25; reduce for higher grades).

Engine: rc-tr.js v0.1.0 · Code pack: TR-TS500-2000-RC.v1 · Date:

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Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.