Stiff column stirrup structure and construction method thereof

The invention provides a stiff column stirrup structure and a construction method thereof. The stiff column stirrup structure comprises a stiff column, a cross-shaped steel column, a plurality of semi-open hoops, a plurality of transverse single-limb hoops and a plurality of longitudinal single-limb hoops; a plurality of rectangular stirrups are annularly arranged on the stiff column along the periphery, and a plurality of longitudinal main reinforcements are evenly arranged at the inner sides of the rectangular stirrups; the cross-shaped steel column is arranged in the stiff column and comprises four T-shaped structures formed by webs and flange plates; the semi-open hoops are correspondingly arranged on the peripheries of the T-shaped structures in a hooping manner, each semi-open hoop is arranged on the corresponding longitudinal rib in a bent and wound manner, and two open limbs of each semi-open hoop are connected with web non-joint portions of the cross-shaped steel column; and the transverse single-lim