The Study of the Supernormal Mechanical Properties of Giant NPR Anchor Cables

Table 1

Mechanical features of the 1 × 9 prestressed strand.

Diameter (mm)	Tensile strength (MPa)	Maximum force (kN)	Stretching force (kN)	Elongation (%)	Stress relaxation ability
					Initial load/maximum engineering pressure	Stress relaxation percentage after 1000 h
18.24	2287	1200	900	3.5	0.7	2.5