Experimental Investigation and Computational Modeling of Seismic Response of a211 1:4 Scale Model Steel Structure with a Load Balancing Supplemental Damping System

摘要

An experimental study to investigate the seismic behavior of steel structures211u001eunder the simulated ground motions is described. It is argued that damper 211u001edistribution should be based on (1) either the interstory deformation or story 211u001eshears, and (2) the overturning moments generated by the lateral inertia loads. 211u001eThe former method was implemented in a non-ductile reinforced concrete frame 211u001e(Pekcan, et al, 1995), while for the latter method an innovate prestressed load-211u001ebalancing tendon system was introduced in this report. Approximate alternatives 211u001ewere experimentally explored on a model steel structure. This load-balancing 211u001esupplemental system consists of prestressed-draped tendons in the shape of the 211u001eoverturning moment diagram. The tendons are connected in series with the 211u001enonlinear dampers and sacrificial fuse-bars. It is concluded that the load-211u001ebalancing tendon-fuse plus damper system is an appropriate cost-effective method 211u001eof mitigating the earthquake induced demands on a steel frame. By careful 211u001edetailing, it is possible to ensure that under design earthquake loads the 211u001estructure remains elastic, while under maximun credible motions fracture of the 211u001esteel frame welded connections can be avoided.