Pin‐supported walls for enhancing the seismic performance of building structures

Abstract

SUMMARY An application of a pin‐supported wall‐frame system in retrofitting an eleven‐story steel reinforced concrete frame is introduced. The retrofit aims at enhancing integrity and avoiding weak story failure in an existing moment‐resisting frame. Seismic performance of the building before and after the retrofit is assessed through nonlinear dynamic analysis. The results show that the pin‐supported walls are effective in controlling the deformation pattern of the ductile frame and hence in avoiding weak story failure. With the well‐controlled deformation pattern, carefully arranged energy dissipating devices are able to concentrate energy dissipations so that damage to the rest of the structure can be significantly reduced. Copyright © 2012 John Wiley & Sons, Ltd.

Seismic performance of controlled spine frames with energy-dissipating members

“…Wada et al [12] employed a pivoting spine concept in the seismic retrofitting of a concrete building in Japan and Janhunen et al [13] employed a similar spine concept in the seismic retrofitting of a steel building in the USA. A concrete wall acts as the core of the rocking to redistribute the lateral forces and displacements without adding significant strength.…”

Seismic-resistant self-centering rocking core system

“…3(b). The behavior is similar to that of the concrete pin-supported wall-frame systems [13]; however, the post tensioned tendon in the wall-frame system is intended to prevent cracking and the resulting degradation of the wall stiffness, not to self-center the system. …”

Shaking table comparative test and associated study of a stepped wall-frame structure

“…The essential principle of these measures is to reasonably control the distribution of structural damage under earthquake excitation. Braced frame structures and rocking wall-frame structures control the damage so that it is u niformly distributed over stories (Ajrab et al, 2004;Mamoru and Masatoshi, 2006;Qu et al, 2012). On the contrary, isolated structures limit the damage to a specifi c position to protect the rest of the structure from being damaged (Naeim and Kelly, 1999).…”