Hajirasouliha, Iman

A Novel Friction-Based Passive Control Wall Damper for Seismic Strengthening of Substandard RC Frames

Abstract eng:
This paper aims to introduce an innovative and cost-effective friction-based wall damper to improve the seismic performance of substandard RC structures. The proposed passive control system consists of a non-structural concrete wall panel that is connected to frame elements by two vertical panel-to-column supports in the lateral sides, one horizontal panelto-beam connection at the bottom, and a friction mechanism at the top. The suggested system is designed to prevent transferring shear forces to the connected beam and column elements and, therefore, to avoid brittle shear failure modes under severe earthquakes. The friction device can be adjusted and tuned independently at each floor to achieve the best seismic performance under design earthquakes. However, obtaining the optimum design slip load distribution can be a challenging task due to nonlinearity of the system and high computational costs. To develop a practical design method, this study investigates the effects of using a wide range of different slip load distributions on the efficiency of the proposed friction-based damper. Extensive non-linear dynamic analyses are performed on 3, 5, 10, 15 and 20-storey substandard RC frames under seven real and synthetic spectrum compatible earthquakes. The results indicate that, irrespective of the heightwise slip load distribution, there is an optimum range for the slip forces which on average leads to a better seismic performance. It is also shown that, in general, using a uniform cumulative slip load distribution pattern leads to the highest energy dissipation in the friction-based dampers and, hence, less damage in the structural elements during strong earthquakes. The results of this study are then used to develop a practical design methodology for optimum performancebased design of friction wall systems by suggesting an empirical equation to estimate optimum slip loads at each storey. The efficiency of the proposed method is demonstrated through several design examples.

Contributors:

Nabid, Neda

Conference Title:

Proceedings of the 16th World Conference on Earthquake Engineering

Conference Title:

16th World Conference on Earthquake Engineering

Conference Venue:

Santiago (CL)

Conference Dates:

2017-01-09 / 2017-01-13

Rights:

Text je chráněný podle autorského zákona č. 121/2000 Sb.