DESIGN AND ASSESSMENT OF SEISMIC RESISTANT BUILDINGS COMPRISING DISSIPATIVE U-DEVICES

Abstract eng:
In the framework of the research project INERD (two Innovations for Earthquake Resistant Design), a new U-shaped dissipative system was developed. This device is composed of a U-shaped steel plate and connect the ends of braces in concentric braced frames (see Figure 1). These U-plates bend and roll along the column face. They act as semi-rigid ductile dissipative brace connections. The devices are of partial strength in order to protect the braces from yielding and buckling, so that energy dissipation occurs exclusively within them and not in the braces. They can easily be replaced if damaged after a strong seismic event. During the Inerd project, these devices and their behavior isolated or in the context of overall frames were extensively investigated through experimental and analytical/numerical studies. The purpose of the present paper, developed in the frame of the project INNOSEIS, is to discuss and illustrate the use of such a system in the context of the full design of entire buildings. This includes a proper calibration of the U-Device and simplified constitutive models suited for design purpose, general design according to normative procedures and evaluation of the efficiency of these devices as energy-dissipating system in comparison to other conventional or innovative devices.

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