Conferences at Faculty of Engineering - Universitas Andalas, Conference on Innovation in Technology and Engineering Science 2018

Numerical Analysis of U-Shaped Hysterisis Steel Damper with Energy Absorber for Seismic Areas

 Eka Satria, Lovely Son, Mulyadi Bur, Muhammad Dzul Akbar, Sabril Haris

 Abstract


This paper investigates one type of metallic dampers used in many large buildings in seismic areas. There are two different characteristics that want to be introduced to the damper. First, the damper should be able to restore a large displacement of structure due to heavy load, and the second, the damper should be able to absorb a seismic energy through a yielding of uncritical part inside of the damper. The previous studies have shown a possibility of the introduced damper to act as a damper as well as energy absorber through yielding on some parts of the damper. However, the occurred yielding caused a plastic deformation after unloading. It means that the U-plate of the damper is considerably damaged (to be torned or even splitted). To avoid this condition, the current study aims to substitute the previous critical area to another part which is considerably uncritical during loading. Therefore, in this paper, an additional part in form of slender column is inserted into damper. The bottom part of the column is clamped to the base plate of the damper, consequently there is a restoring moment acting on the column. This restoring moment is considered able to restore a large displacement of damper, to at least a small residual plastic displacement after unloading. If yielding is occured, the damage can be initially localized in slender column, before reaching the U-plate. A stiffness, strength and energy dissipation of the modified damper are determined by a nonlinear finite element technique which involves both geometrically and materially nonlinearities. The model was subjected by a monotonic increasing load which is applied horizontally through method of displacement control until one cycle of hysteresis is formed. The final result is in a term of comparison of hysterisis curves between a full model of hysterisis damper with and without a slender column.

Keywords


hysteresis damper; stiffness; enrgy dissipation; finite element; dynamic response