Performance Based Seismic Design of a 75 Story Buckling Restrained Slender Steel Plate Shear Wall Tower

Abstract

Listen

Translate article

The Jinta Tower is a 75-story building located in Tianjin, China, with slender steel plate shear walls (SPSW) used as the primary lateral load resisting system. Construction detail, method and schedule constraints result in the steel plates being subject to gravity loads. Chinese codes require that steel plates not buckle in frequent (50 year) seismic events in addition to the typical performance requirements in the moderate (475 year) and rare (2000 year) seismic events. To address these constraints, a buckling restrained slender steel plate shear wall system - SPSWs with vertical stiffeners to enhance gravity load carrying capacity of the plates and delay buckling is developed. The approach for stiffener design included use of buckling and interaction formulae as well as pushover, parametric and sensitivity studies. The rare earthquake performance was studied and prescribed performances were verified by nonlinear dynamic analyses. The SPSWs were finely meshed to a 0.1m x 0.1m grid incorporating geometric and material nonlinearities. Geometric imperfections were also taken into account. Other structural members such as concrete filled tube columns, floor slabs, steel beams/braces and stiffeners were also meshed to a similar size to accurately model their nonlinearities. A ten million degree of freedom nonlinear model of the structure was created for three 40s earthquake time history analyses on the ABAQUS parallel platform. Despite the high initial gravity stresses, the stiffeners were demonstrated to push the inception of plate buckling out beyond the frequent events and provide great ductility and ability to absorb the earthquake input energy through significant tension field action in the larger events.