Abstract
Connections in MRFs are the most important members and seismic behaviour is affected by function of beam column connections as well as column foundation connections. If the connections are able to provide the required ductility and efficiency against the seismic excitation, the seismic capacity of the MRF performed by these connections will be affected. SMAs have recently been used as a tool to dissipate energy in structures. So far, using of them for column foundation connections has been applied much less. In this paper, SMAs have been introduced and an innovated column foundation connection equipped with SMA has been suggested. Micro and macro behaviour of the connection has been studied and it was applied in sample MRF. Seismic response of the MRF under different earthquakes by equipping the connection with steels/SMAs bars have been studied and compared. Finally, results indicated that MRF with this connection showed proper seismic performance.
Highlights
One of the resistant structures against lateral loads is moment resistant frame (MRF) in which the beams and columns form a moment frame through a fixed support in connections
In response to superelastic shape memory alloys, the phase transformations lead to nonlinear hysteresis reaction
The shape memory effect has been tested in steel beam column connection using a Nitinol Shape Memory Alloy (SMA) under semi static loading
Summary
One of the resistant structures against lateral loads is moment resistant frame (MRF) in which the beams and columns form a moment frame through a fixed support in connections. In addition to beam-column connections, the method of connecting the columns to foundations is of great importance in tolerating lateral loads by the MRFs. Different ways of connecting column to foundation brings about different performance of MRFs. Since the connecting method of column to foundation was decided by the designer, one can decide on frame performance selection. Having applied the required plans in the connection, one can improve the stiffness, lateral ductility of steel moment frames (energy dissipation capability arising from seismic stimulations), and quake removing elements (kinds, stiffness, mortality). Shape memory alloys (SMAs) are exotic materials with magical properties under visible permanent deformations by up to 10% or more They entail metallic properties such as strength, stiffness, high expenditure, cast ability and so on [5]. They are capable of high strain recovery (about 8%)
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