Table 2 Properties of the steel tubes.

From: Tests and deflection calculation method for circular concrete-filled steel tubular columns under very low-elevation lateral impact loads

Test coupons

Young’s modulus Es (GPa)

Yield strength fy (MPa)

Ultimate strength fu (MPa)

Elongation (%)

2.0 mm steel tube

198

338

377

21.68

3.5 mm steel tube

223

323

393

21.57

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